{"product_id":"fisetin-500mg-senolytic-flavonoid-for-cellular-cleanup","title":"Fisetin 500mg | Mayo-Ranked Senolytic Flavonoid for Cellular Cleanup","description":"\u003ch2\u003eThe 30-second answer\u003c\/h2\u003e\n\u003cp\u003eFisetin is a plant flavonoid — the most concentrated dietary source is the strawberry — that has emerged as one of the most-studied \u003cem\u003esenolytics\u003c\/em\u003e in human longevity research. A senolytic is a compound that selectively pushes \u003cstrong\u003esenescent cells\u003c\/strong\u003e (the inflammation-leaking “zombie cells” that accumulate with age and refuse to die on their own) into apoptosis, while leaving healthy cells alone. In a Mayo Clinic head-to-head screen of ten natural flavonoids, fisetin was the most potent senolytic of the set (Yousefzadeh et al., \u003cem\u003eEBioMedicine\u003c\/em\u003e, 2018). That paper sparked a string of human clinical trials that are still running — the AFFIRM-LITE trial at Mayo (NCT03675724), the Wake Forest fisetin-osteoarthritis trial (NCT04210986), the kidney-disease pilot (NCT03325322), and several others mapped at ClinicalTrials.gov.\u003c\/p\u003e\n\u003cp\u003eEach True Health Protocol bottle contains \u003cstrong\u003e60 vegan capsules\u003c\/strong\u003e, each providing \u003cstrong\u003e500 mg of fisetin standardized to 98% by HPLC\u003c\/strong\u003e from \u003cem\u003eRhus succedanea\u003c\/em\u003e bark (the most concentrated natural source) plus \u003cstrong\u003e5 mg of BioPerine®-grade piperine\u003c\/strong\u003e to slow first-pass hepatic metabolism and lift plasma fisetin. Two protocols are supported by the literature: \u003cstrong\u003e500 mg daily\u003c\/strong\u003e (the “low-and-steady” longevity-community protocol) or \u003cstrong\u003e1,000 mg on two consecutive days each month\u003c\/strong\u003e (the “hit-and-run” pulse used in Mayo’s clinical trials). Both pair cleanly with NMN, Resveratrol, Spermidine, Apigenin, Quercetin, and CoQ10 because fisetin operates on a \u003cem\u003edifferent\u003c\/em\u003e longevity pathway than any of those: it removes damaged cells rather than tuning the metabolism of healthy ones.\u003c\/p\u003e\n\n\u003ch2\u003eWhat senescent cells are, and why clearing them matters\u003c\/h2\u003e\n\u003cp\u003eEvery time one of your cells divides, it accumulates a small amount of damage — oxidized DNA bases, misfolded proteins, frayed telomeres. Most damaged cells either repair themselves or die cleanly through apoptosis, the orderly self-destruct that keeps tissue healthy. A small fraction does neither. They stop dividing but stay alive, locked in a metabolic state called \u003cstrong\u003ecellular senescence\u003c\/strong\u003e. They’re no longer functional — but they’re also no longer cleared.\u003c\/p\u003e\n\u003cp\u003eThe problem isn’t that they sit there quietly. They actively secrete a soup of inflammatory cytokines, chemokines, growth factors, and matrix-remodeling enzymes called the \u003cstrong\u003eSenescence-Associated Secretory Phenotype\u003c\/strong\u003e, or \u003cstrong\u003eSASP\u003c\/strong\u003e (Coppe et al., \u003cem\u003eAnnual Review of Pathology\u003c\/em\u003e, 2010). That secretion ages the tissue around the senescent cell — it inflames neighboring cells, recruits immune cells that exhaust trying to clear it, and remodels the extracellular matrix in ways that look strikingly like fibrosis or chronic inflammation. By age 60, depending on the tissue, the body carries \u003cstrong\u003efour to ten times more\u003c\/strong\u003e senescent cells than it did at 30 (Tuttle et al., \u003cem\u003eAging Cell\u003c\/em\u003e, 2020).\u003c\/p\u003e\n\u003cp\u003eThe senescent-cell hypothesis of aging is straightforward: a meaningful fraction of what we call “aging” — the slow loss of skin elasticity, the stiffening of arteries, the rise in tissue inflammation, the fading of immune function, the loss of muscle quality — is downstream of accumulated senescent cells leaking SASP into otherwise healthy tissue. Selectively clearing those cells should, in principle, reverse part of that decline.\u003c\/p\u003e\n\u003cp\u003eThat hypothesis was first tested in genetically engineered mice by the Mayo Clinic group of Jan van Deursen and James Kirkland (Baker et al., \u003cem\u003eNature\u003c\/em\u003e, 2011, and the follow-up in 2016). When senescent cells were continuously cleared throughout adulthood, median lifespan extended \u003cstrong\u003e25–35%\u003c\/strong\u003e, healthspan markers (frailty, glucose tolerance, hair density, kyphosis, exercise capacity) improved, and several age-related diseases were delayed. That landmark result drove a search for \u003cstrong\u003echemical\u003c\/strong\u003e senolytics — compounds that could replicate genetic senescent-cell clearance pharmacologically. Fisetin emerged from exactly that search.\u003c\/p\u003e\n\n\u003ch2\u003eWhy fisetin specifically: the Mayo head-to-head ranking\u003c\/h2\u003e\n\u003cp\u003eIn 2018, Yousefzadeh and colleagues at Mayo Clinic and the Scripps Research Institute published a screen of ten natural flavonoids for senolytic activity (\u003cem\u003eEBioMedicine\u003c\/em\u003e, 2018, vol. 36, pp. 18–28). They tested fisetin, quercetin, luteolin, rutin, myricetin, apigenin, kaempferol, naringenin, catechin, and curcumin against senescent human umbilical-vein endothelial cells (HUVECs), murine embryonic fibroblasts, and aged mouse tissue. Fisetin was the only flavonoid in the set that significantly killed senescent cells across \u003cem\u003eevery\u003c\/em\u003e assay at concentrations the others couldn’t match. In aged C57BL\/6 mice, oral fisetin reduced senescent-cell burden in fat, kidney, and liver and extended median and maximum lifespan by approximately 9–10%. The conclusion was that fisetin — not quercetin, not curcumin, not the rest of the field — was the most potent natural senolytic flavonoid then known.\u003c\/p\u003e\n\u003cp\u003eThat paper landed at the perfect time. Mayo had already opened the AFFIRM-LITE trial (NCT03675724) using \u003cstrong\u003e20 mg\/kg\/day\u003c\/strong\u003e of fisetin for two consecutive days, repeated monthly — the same hit-and-run protocol that worked in the mouse studies. For a 75 kg adult, that translates to roughly \u003cstrong\u003e1,500 mg per day for two days\u003c\/strong\u003e. Subsequent Mayo trials (kidney disease, frailty, COVID-19 long-tail, osteoarthritis) all use variations of the same pulse architecture.\u003c\/p\u003e\n\u003cp\u003eThe mechanism Yousefzadeh et al. characterized is multimodal — fisetin doesn’t just hit one anti-apoptotic node, which is part of why it’s effective:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBCL-2\/BCL-xL inhibition\u003c\/strong\u003e — senescent cells become addicted to anti-apoptotic survival proteins (the “senescent-cell anti-apoptotic pathways,” or SCAPs). Fisetin partially inhibits BCL-2 family members, lifting the survival brake selectively in senescent cells.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePI3K\/AKT\/mTOR modulation\u003c\/strong\u003e — fisetin downregulates this survival axis in senescent cells, which removes another pillar holding them alive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNF-κB suppression\u003c\/strong\u003e — fisetin damps the master regulator of SASP transcription, reducing inflammatory secretion even before the senescent cells are cleared.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSIRT1 activation\u003c\/strong\u003e — like resveratrol, fisetin appears to activate SIRT1, the longevity sirtuin that overlaps with the NMN\/NAD\u003csup\u003e+\u003c\/sup\u003e pathway.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect flavonoid antioxidant activity\u003c\/strong\u003e — fisetin chelates iron, scavenges peroxyl radicals, and supports glutathione recycling, providing background antioxidant cover.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThree of those mechanisms (BCL-2 inhibition, PI3K\/AKT downregulation, NF-κB suppression) are the same nodes targeted by the prescription senolytic combination \u003cstrong\u003edasatinib + quercetin (D+Q)\u003c\/strong\u003e studied at Mayo by Kirkland’s group (Justice et al., \u003cem\u003eEBioMedicine\u003c\/em\u003e, 2019, in idiopathic pulmonary fibrosis; Hickson et al., \u003cem\u003eEBioMedicine\u003c\/em\u003e, 2019, in diabetic kidney disease). Fisetin is being studied as a natural-product alternative because it hits the same SCAP nodes without dasatinib’s tyrosine-kinase-inhibitor side effect profile.\u003c\/p\u003e\n\n\u003ch2\u003eThe human clinical trials — what we have and what is still pending\u003c\/h2\u003e\n\u003cp\u003eAs of 2026, fisetin is the most-studied natural senolytic in active human trials. The notable ones:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAFFIRM-LITE (NCT03675724)\u003c\/strong\u003e — Mayo Clinic, frailty in older women. 20 mg\/kg\/day × 2 consecutive days, monthly. Results expected to read out in 2026–2027.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFisetin in Diabetic CKD (NCT03325322)\u003c\/strong\u003e — pilot in chronic-kidney-disease patients, same pulse protocol. The kidney is one of the tissues with the highest senescent-cell burden in aged mice.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFisetin in Osteoarthritis (NCT04210986)\u003c\/strong\u003e — Wake Forest. Senescent chondrocytes in joint cartilage are implicated in OA pathogenesis (Jeon et al., \u003cem\u003eNature Medicine\u003c\/em\u003e, 2017).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFisetin in Long COVID (NCT04476953)\u003c\/strong\u003e — the senescent-cell-clearance hypothesis for post-acute-sequelae symptoms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKhan et al., 2023 (\u003cem\u003eCell Metabolism\u003c\/em\u003e)\u003c\/strong\u003e — the first peer-reviewed human safety\/PK study of high-dose oral fisetin, confirming the pulse protocol is tolerated.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhat we will not tell you: that these trials have already proven fisetin extends human lifespan. They have not. Most are still recruiting or in mid-readout. What the human data \u003cem\u003edoes\u003c\/em\u003e show, consistently, is that the pulse protocol is well-tolerated, that plasma fisetin reaches senolytic concentrations, and that biomarkers of senescent-cell burden (p16\u003csup\u003eINK4a\u003c\/sup\u003e, SASP cytokines like IL-6 and IL-8) drop measurably after dosing. The mechanism translates from mouse to human. The clinical-outcome question — does this make people live longer or healthier — is what the next decade will answer.\u003c\/p\u003e\n\n\u003ch2\u003eThe bioavailability problem (and why piperine matters)\u003c\/h2\u003e\n\u003cp\u003eFisetin’s biggest limitation as an oral supplement is poor bioavailability. Like most flavonoids, it’s extensively metabolized on first pass through the liver: it gets glucuronidated and sulfated within minutes of absorption, so a large fraction of an oral dose is converted to inactive conjugates before it ever reaches a senescent cell. Pharmacokinetic studies put oral fisetin’s absolute bioavailability in the single digits without absorption support (Touil et al., \u003cem\u003eCancer Chemother Pharmacol\u003c\/em\u003e, 2011; Krishnakumar et al., \u003cem\u003eEur J Pharm Sci\u003c\/em\u003e, 2015).\u003c\/p\u003e\n\u003cp\u003eThree strategies are used in the field:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePair with piperine.\u003c\/strong\u003e Black-pepper extract is a pan-inhibitor of CYP3A4, UGT (glucuronidation), and SULT (sulfation) at the dose typical of supplements (5–10 mg). Across multiple flavonoids and curcuminoids, piperine roughly doubles plasma AUC. We use BioPerine®-grade piperine at 5 mg per capsule for this reason.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTake with dietary fat.\u003c\/strong\u003e Fisetin is fat-soluble. Plasma concentration is materially higher when it’s ingested with a meal containing some fat — eggs, avocado, full-fat yogurt, olive oil all work. This is part of why we recommend taking the daily capsule with breakfast rather than on an empty stomach.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse a liposomal or phytosome carrier.\u003c\/strong\u003e Some products encapsulate fisetin in phospholipid liposomes or galactosylated nanoparticles. These can lift bioavailability further, though they’re harder to standardize and the published RCT base for liposomal fisetin specifically is thinner than for plain fisetin + piperine. We use the studied combination.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eCombining piperine with a fatty meal is the protocol used in most contemporary fisetin trials. It’s simple, it’s evidence-based, and it’s what we’ve built into the formulation.\u003c\/p\u003e\n\n\u003ch2\u003eForm comparison: what to look for in a fisetin supplement\u003c\/h2\u003e\n\u003cp\u003eFisetin is sold in several forms with very different real-world potency. Here’s how they compare:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e98% standardized fisetin from \u003cem\u003eRhus succedanea\u003c\/em\u003e (this product).\u003c\/strong\u003e The wax-tree (also known as Japanese sumac) is the most concentrated natural source of fisetin. Bark extract is concentrated and standardized to 98% fisetin by HPLC, which is what nearly every fisetin clinical trial has used. Each 500 mg capsule actually delivers ~490 mg of fisetin.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandardized fisetin from \u003cem\u003eCotinus coggygria\u003c\/em\u003e (smoke bush).\u003c\/strong\u003e A second botanical source, also concentrated. Comparable potency to \u003cem\u003eRhus succedanea\u003c\/em\u003e at the same standardization. Fine choice if it’s what’s available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrawberry-extract fisetin.\u003c\/strong\u003e Fisetin is the marker compound that made fresh strawberries famous in flavonoid research, but a fresh strawberry is only ~0.16 mg fisetin per gram. Even a concentrated strawberry extract rarely exceeds a few percent fisetin by weight. A “strawberry fisetin” supplement may deliver 5–50 mg of actual fisetin per capsule — a fraction of the senolytic dose. Read the standardization label, not just the front of the bottle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneric flavonoid blends labeled “senolytic complex.”\u003c\/strong\u003e Often combine quercetin + fisetin + apigenin + curcumin at low doses. Fine as a foundational antioxidant blend, but not what the senolytic literature dosed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiposomal \/ phytosome fisetin.\u003c\/strong\u003e Higher bioavailability per milligram, but more expensive and the published RCT base for the specific liposomal form is thinner. The dose math also gets confusing — some labels report “equivalent to” doses rather than actual fisetin content.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA simple rule: if the label doesn’t state the percentage standardization (e.g., “98% fisetin by HPLC”) and the actual fisetin content per capsule, you can’t replicate the clinical-trial dose with it.\u003c\/p\u003e\n\n\u003ch2\u003eTwo protocols, both supported in the literature\u003c\/h2\u003e\n\u003cp\u003eThe fisetin-dosing question that comes up most often: \u003cem\u003edaily or pulse?\u003c\/em\u003e Both have backing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe daily protocol: 500 mg with breakfast.\u003c\/strong\u003e One capsule a day, taken with a meal that contains some fat. This is what most longevity-community readers actually run, because consistency tends to win in real life and because fisetin’s background flavonoid effects (NF-κB suppression, antioxidant cover, SIRT1 activation) plausibly accrue with daily dosing. There is no published head-to-head comparison telling us this is superior to pulse dosing for senolytic outcomes — but it’s well-tolerated, simple, and integrates cleanly into a daily stack alongside NMN, resveratrol, and CoQ10.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe monthly pulse protocol: 1,000 mg on two consecutive days each month.\u003c\/strong\u003e This is the protocol Mayo’s clinical trials use and what worked in the original mouse studies. The senolytic logic is “hit and run” — you don’t need a senolytic on board every day, because senescent cells re-accumulate slowly. A high pulse dose drives them into apoptosis; the body clears the apoptotic debris over the following days; you wait three to four weeks and repeat. Pick a fixed pair of days each month (the 1st and 2nd, or the first weekend of the month) so you don’t forget.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe hybrid most readers settle into:\u003c\/strong\u003e 500 mg daily for the background flavonoid and gentler senescent-cell pressure, plus a once-per-quarter 2×1,000 mg pulse for a deeper clearance cycle. There’s no published trial of this hybrid — it’s a synthesis a lot of the longevity-medicine field has converged on as a practical compromise.\u003c\/p\u003e\n\u003cp\u003eEither way, take it with food. The high-pulse protocol is meaningful enough that we recommend running it on a weekend (or any day with no high-stakes work or driving) the first time, just to know how your body responds.\u003c\/p\u003e\n\n\u003ch2\u003eHow fisetin fits the rest of your stack\u003c\/h2\u003e\n\u003cp\u003eFisetin solves a very specific problem — the buildup of senescent cells — that no other longevity supplement directly addresses. That makes it complementary to, not competitive with, almost everything else in a longevity stack. Three architectures to think about:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStack 1: The Cellular Cleanup pair (most popular).\u003c\/strong\u003e Fisetin + Spermidine. Spermidine induces \u003cem\u003eautophagy\u003c\/em\u003e, the recycling machinery inside healthy cells that clears worn-out organelles and protein aggregates. Fisetin triggers \u003cem\u003eapoptosis\u003c\/em\u003e in cells too damaged to recycle. They handle the two ends of cellular waste management: keep healthy cells running cleanly (spermidine), and remove the cells that are beyond saving (fisetin). Add \u003ca href=\"\/products\/quercetin-500mg-senolytic-flavonoid-natural-antihistamine\"\u003eQuercetin 500mg\u003c\/a\u003e if you want a second senolytic with overlapping mechanisms (Mayo’s D+Q protocol uses quercetin), or \u003ca href=\"\/products\/apigenin-50mg-cd38-inhibitor-for-nmn-nad-stacks\"\u003eApigenin 50mg\u003c\/a\u003e if you also want a CD38 inhibitor protecting NAD\u003csup\u003e+\u003c\/sup\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStack 2: The NAD\u003csup\u003e+\u003c\/sup\u003e\/Sirtuin \/ Senolytic stack.\u003c\/strong\u003e Fisetin + \u003ca href=\"\/products\/pure-nmn-500mg-60-capsules-30-day-supply\"\u003ePure NMN 500mg\u003c\/a\u003e (or \u003ca href=\"\/products\/zoone-nad-1000mg-pure-focus-formula\"\u003eNMN 1000mg Double Strength\u003c\/a\u003e) + \u003ca href=\"\/products\/resveratrol-600mg-60-capsules-30-day-supply\"\u003eResveratrol 600mg\u003c\/a\u003e. NMN raises NAD\u003csup\u003e+\u003c\/sup\u003e, the metabolic currency that sirtuins (and DNA-repair enzymes like PARPs) require. Resveratrol activates SIRT1 directly. Fisetin clears senescent cells so NAD\u003csup\u003e+\u003c\/sup\u003e isn’t being burned by inflammation in the first place. Add \u003ca href=\"\/products\/tmg-1000mg-trimethylglycine-methyl-donor-for-nmn-nad-stacks\"\u003eTMG 1000mg\u003c\/a\u003e as the methyl-donor partner for NMN, and \u003ca href=\"\/products\/coq10-400mg-maximum-strength\"\u003eCoQ10 400mg\u003c\/a\u003e for mitochondrial-membrane support.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStack 3: The full Cellular Longevity Protocol.\u003c\/strong\u003e Fisetin + Spermidine + Quercetin + NMN + Resveratrol + Apigenin + CoQ10 + Urolithin A. Each of these targets a different hallmark of aging (senescent-cell clearance, autophagy, NAD\u003csup\u003e+\u003c\/sup\u003e, sirtuin activation, CD38 inhibition, mitochondrial-membrane health, mitophagy). They’re not redundant. The \u003ca href=\"\/products\/longevity-stack-bundle-nmn-500mg-resveratrol-600mg\"\u003eLongevity Stack Bundle\u003c\/a\u003e covers the NMN + resveratrol foundation; this fisetin SKU slots in alongside it.\u003c\/p\u003e\n\n\u003ch2\u003eWho this is for — and who it’s not for\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFisetin is for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou’re over 40 and have already built the NMN\/resveratrol\/CoQ10 foundation; you’re ready for the senolytic layer of a longevity stack.\u003c\/li\u003e\n\u003cli\u003eYou’ve read the senescent-cell hypothesis literature and want to act on it before the prescription senolytics (D+Q, navitoclax) become widely available.\u003c\/li\u003e\n\u003cli\u003eYou want a flavonoid that overlaps with the diet (strawberries) but at a dose food can’t reach.\u003c\/li\u003e\n\u003cli\u003eYou’re running a structured longevity protocol and want a once-monthly pulse you can put on the calendar.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFisetin is NOT for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou’re pregnant or breastfeeding (no safety data, and senolytic activity is the last thing a developing fetus needs — growing tissue depends on transient senescence as a normal developmental signal).\u003c\/li\u003e\n\u003cli\u003eYou’re on warfarin, apixaban, rivaroxaban, dabigatran, or other anticoagulants — flavonoids modestly affect platelet aggregation and CYP-pathway anticoagulant metabolism. Discuss with your prescriber before starting.\u003c\/li\u003e\n\u003cli\u003eYou have surgery scheduled in the next two weeks — pause for the same reason.\u003c\/li\u003e\n\u003cli\u003eYou’re on chemotherapy or in active cancer treatment — senolytics have complex interactions with chemo (some agents \u003cem\u003einduce\u003c\/em\u003e senescence as a tumor-control mechanism, and clearing those cells changes the math). Coordinate with your oncologist.\u003c\/li\u003e\n\u003cli\u003eYou’re on tamoxifen, dasatinib, or any other BCR-ABL\/SRC kinase inhibitor — possible additive pathway effects.\u003c\/li\u003e\n\u003cli\u003eYou’re under 18 — no studies in pediatric populations, and growing tissue uses transient senescence in normal development.\u003c\/li\u003e\n\u003cli\u003eYou’re looking for a same-day energy or focus lift — senolytics work over months, not minutes. Choose \u003ca href=\"\/products\/zoone-nad-1000mg-pure-focus-formula\"\u003eNAD\u003csup\u003e+\u003c\/sup\u003e 1000mg Pure Focus\u003c\/a\u003e for that.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat to expect, and on what timeline\u003c\/h2\u003e\n\u003cp\u003eSenolytic effects are slow and quiet. Most people don’t \u003cem\u003efeel\u003c\/em\u003e fisetin the way they might feel a B-vitamin or caffeine. The benefit is structural — fewer SASP-leaking cells in your tissues, less background inflammation, better tissue maintenance over time. Realistic expectations:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeeks 1–2:\u003c\/strong\u003e No noticeable subjective change. Some readers report a mild reduction in joint stiffness or skin reactivity, particularly if they’ve been carrying chronic low-grade inflammation. Plasma fisetin and metabolites peak within hours of dosing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeeks 2–4:\u003c\/strong\u003e If you’re running the daily protocol, this is the window where some readers notice quieter joints (the senescent-chondrocyte hypothesis of OA), better post-exercise recovery, or a gentler skin-inflammation response. Still subtle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeeks 4–8:\u003c\/strong\u003e The compounding window. Tissue-level senescent-cell burden is dropping in animal studies on this timeline. Subjective markers — recovery, joint comfort, skin tone — are typically more apparent at this point.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3–6 months:\u003c\/strong\u003e The structural payoff. The Mayo trials measure outcomes (frailty index, walking speed, kidney function, OA pain) at 3, 6, and 12 months. This is the timescale on which senolytic protocols are designed to read out. Continue running the protocol; this is the window the literature is built around.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12+ months:\u003c\/strong\u003e Sustained protocol territory. The animal-model lifespan effects accrue over the back half of life; the human equivalent is years of consistent protocol, not weeks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you’re someone who tracks objective markers (hsCRP, IL-6, kidney function, HRV, grip strength), those are the metrics fisetin is designed to move — and they move on the months-to-quarters timescale, not the days-to-weeks one.\u003c\/p\u003e\n\n\u003ch2\u003eDirections\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDaily protocol:\u003c\/strong\u003e Take 1 capsule (500 mg fisetin + 5 mg piperine) with breakfast, on a meal that contains some fat. This is the simplest protocol and the one we recommend for most readers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMonthly pulse protocol (Mayo Clinic style):\u003c\/strong\u003e Take 2 capsules (1,000 mg fisetin) on two consecutive days each month, with a meal. Pick a fixed pair of days (the first of the month and the day after, or the first weekend) so you don’t forget. Some readers run a weekend pulse to leave themselves space if they feel a transient inflammatory shift as senescent cells are cleared.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHybrid (community protocol):\u003c\/strong\u003e 500 mg daily for the steady flavonoid layer plus a quarterly 2×1,000 mg pulse for deeper clearance cycles.\u003c\/p\u003e\n\u003cp\u003ePair the dose with NMN, Resveratrol, Spermidine, Apigenin, Quercetin, and CoQ10 freely — none of them compete with fisetin pharmacokinetically. Avoid stacking with other supplements that strongly inhibit clotting (high-dose fish oil, ginkgo, garlic extract) on pulse-dose days unless your clinician has weighed in.\u003c\/p\u003e\n\n\u003ch2\u003eWhat’s in the bottle\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFisetin (98% pure, from \u003cem\u003eRhus succedanea\u003c\/em\u003e bark extract):\u003c\/strong\u003e 500 mg per capsule\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiperine (BioPerine®-grade black-pepper extract):\u003c\/strong\u003e 5 mg per capsule, included for bioavailability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapsule shell:\u003c\/strong\u003e vegetable cellulose (HPMC) — suitable for vegan and vegetarian diets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo proprietary blend.\u003c\/strong\u003e Every active is disclosed at full label-claim weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree of:\u003c\/strong\u003e gluten, soy, dairy, GMO ingredients, titanium dioxide, magnesium stearate, artificial colors, and added sweeteners\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTested:\u003c\/strong\u003e third-party verified by an ISO 17025–accredited laboratory for identity (HPLC), potency, heavy metals (lead, cadmium, mercury, arsenic), residual solvents, pesticide residues, and microbial contamination\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing:\u003c\/strong\u003e cGMP-certified facility, NSF-registered process\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60 capsules per bottle:\u003c\/strong\u003e 60-day supply at the daily protocol, or 30 monthly pulse cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eQuality, sourcing, and supply chain\u003c\/h2\u003e\n\u003cp\u003eThe fisetin in this bottle is sourced from \u003cem\u003eRhus succedanea\u003c\/em\u003e bark, the most concentrated natural source — the same source used in nearly every published fisetin clinical trial. Raw material is extracted with food-grade ethanol and water, dried, milled, and standardized to 98% fisetin by HPLC. The 98% standardization matters: lower-grade extracts (50–70% fisetin) are less expensive but require more capsule weight to deliver the same fisetin dose, and the “balance” in those extracts is uncharacterized plant material.\u003c\/p\u003e\n\u003cp\u003eBioPerine® is a 95%-piperine standardized extract of \u003cem\u003ePiper nigrum\u003c\/em\u003e manufactured by Sabinsa — the form used in most flavonoid bioavailability research. We use BioPerine® specifically rather than generic black-pepper powder because the published bioavailability data is on the standardized extract, not the spice.\u003c\/p\u003e\n\u003cp\u003eEvery batch is third-party tested. Certificates of analysis are available on request. Capsules are filled, sealed, and bottled at a cGMP-certified, NSF-registered facility under the supervision of a qualified analytical chemist.\u003c\/p\u003e\n\u003cp\u003eThe bottle is amber HDPE with a tamper-evident seal and an oxygen-absorber sachet. Store at room temperature, out of direct sunlight. Best used within 24 months of the manufacture date stamped on the bottom.\u003c\/p\u003e\n\n\u003ch2\u003eSafety and interactions\u003c\/h2\u003e\n\u003cp\u003eFisetin is generally well-tolerated at the doses used in published clinical work. The flagged interactions, in order of importance:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnticoagulants and antiplatelets.\u003c\/strong\u003e Warfarin, apixaban, rivaroxaban, dabigatran, clopidogrel, aspirin at antiplatelet doses. Flavonoids can additively affect platelet aggregation and CYP3A4-mediated drug metabolism. Discuss with your prescriber before starting and pause 7–14 days before any planned procedure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive chemotherapy or immunotherapy.\u003c\/strong\u003e Senolytics interact with cancer therapy in complex, sometimes opposing ways. Coordinate timing with your oncologist.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTamoxifen, dasatinib, BCR-ABL\/SRC kinase inhibitors.\u003c\/strong\u003e Possible additive pathway effects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePregnancy and breastfeeding.\u003c\/strong\u003e Not recommended — no safety data, and developmental tissue uses transient senescence as a normal signaling pathway.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurgery.\u003c\/strong\u003e Pause 14 days before any planned procedure for the platelet-aggregation reason.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiver disease.\u003c\/strong\u003e Hepatic metabolism of fisetin is extensive; talk to your hepatologist before starting if you have moderate-to-severe liver impairment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGI sensitivity to piperine.\u003c\/strong\u003e Rare but possible — some readers find black-pepper extract irritating on an empty stomach. Always take with a meal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eReported side effects in the published literature are minimal at the daily 500 mg dose. At the 1,000–1,500 mg pulse dose, transient mild GI symptoms (loose stool, mild abdominal discomfort) and short-lived fatigue have been reported in a minority of subjects, generally resolving within 24–48 hours.\u003c\/p\u003e\n\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow long until I notice anything?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eHonestly, the senolytic effect is slow and quiet. Most readers don’t \u003cem\u003efeel\u003c\/em\u003e fisetin the way they feel caffeine or a B-vitamin. Subjective shifts (joint comfort, recovery, skin reactivity) start to appear in the 4–8 week window for daily users. Structural senescent-cell-clearance benefits accrue on the 3–12 month timescale — that’s how the Mayo trials are designed. If you’re looking for a same-day lift, choose \u003ca href=\"\/products\/zoone-nad-1000mg-pure-focus-formula\"\u003eNAD\u003csup\u003e+\u003c\/sup\u003e 1000mg Pure Focus\u003c\/a\u003e; fisetin is a slow-burn longevity lever.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I run the daily or the monthly pulse protocol?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMayo Clinic’s clinical trials use the pulse protocol because that’s what worked in the original mouse studies and it’s easier to standardize for research. Daily dosing at 500 mg is also studied (smaller human trials and a long history of strawberry-flavonoid epidemiology) and is what most longevity-community readers actually run, because consistency wins in real life. There is no published head-to-head telling us one is clearly better. We err toward daily for most readers and recommend the pulse for someone running a structured protocol with a monthly calendar reminder. The hybrid — daily plus quarterly pulse — is the practical compromise the field has converged on.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I take fisetin with quercetin?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Mayo’s D+Q (dasatinib + quercetin) trials specifically pair quercetin with another senolytic node, and the fisetin-plus-quercetin combination has been studied in animal work because they hit overlapping but non-identical SCAP nodes. They don’t antagonize each other. Many longevity protocols rotate or combine them. If you want both, our \u003ca href=\"\/products\/quercetin-500mg-senolytic-flavonoid-natural-antihistamine\"\u003eQuercetin 500mg\u003c\/a\u003e SKU is the matched-dose pairing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is piperine included?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFisetin’s main weakness is poor bioavailability — most of an oral dose is glucuronidated and sulfated in the liver before reaching circulation. Piperine partially inhibits the CYP and UGT pathways responsible, roughly doubling plasma fisetin AUC in pharmacokinetic studies. The 5 mg dose is well below any threshold for stomach irritation or pharmacologically meaningful drug interaction.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes fisetin replace Spermidine in the Cellular Longevity stack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo — they do different jobs. Spermidine induces \u003cem\u003eautophagy\u003c\/em\u003e, the recycling process inside healthy cells that clears damaged organelles and protein aggregates. Fisetin triggers \u003cem\u003eapoptosis\u003c\/em\u003e in cells that are too damaged to recycle and need to be removed. They complement each other. \u003ca href=\"\/products\/spermidine-10mg-wheat-germ-extract\"\u003eSpermidine 10mg\u003c\/a\u003e keeps healthy cells running cleanly; fisetin clears the cells that are beyond saving.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy \u003cem\u003eRhus succedanea\u003c\/em\u003e and not strawberry extract?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe marker compound that made fresh strawberries famous in fisetin research is the same molecule that’s in \u003cem\u003eRhus succedanea\u003c\/em\u003e, but the concentration is wildly different. A pound of fresh strawberries delivers 8–10 mg of fisetin. A 500 mg capsule of 98% \u003cem\u003eRhus succedanea\u003c\/em\u003e extract delivers ~490 mg. Strawberry-extract fisetin supplements typically deliver 5–50 mg of actual fisetin per capsule, which is below the senolytic dose used in any published trial. The botanical source matters less than the actual fisetin content per capsule.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill I feel a “senescent-cell die-off”?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSome readers report a transient mild fatigue or a light flu-like feeling for 12–24 hours after the first 1,000 mg pulse dose — possibly the immune system clearing apoptotic-cell debris. This is uncommon, mild, and self-limited. If it happens, scale back to 500 mg for the next pulse and work up.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I take fisetin with NMN, resveratrol, and CoQ10?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes — this is the canonical longevity stack. Fisetin operates on a different pathway (clearing damaged cells) than NMN (raising NAD\u003csup\u003e+\u003c\/sup\u003e), resveratrol (activating SIRT1), or CoQ10 (mitochondrial-membrane electron transport). They’re complementary. The \u003ca href=\"\/products\/longevity-stack-bundle-nmn-500mg-resveratrol-600mg\"\u003eLongevity Stack Bundle\u003c\/a\u003e handles the NMN + resveratrol foundation; this fisetin SKU is the senolytic layer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs fisetin safe long-term?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe published human trials run 6–12 months at the pulse protocol and report no safety concerns at that timescale. Fisetin is also a normal dietary flavonoid — humans have eaten it in small amounts for as long as we’ve eaten strawberries and onions. The supplemental dose pushes the range up dramatically, so “long-term” in the supplement sense isn’t the same as the dietary baseline. We’re comfortable saying multi-year daily use looks safe based on what’s currently published; we’re not comfortable making claims past what the data shows.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat about fisetin and cancer?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is where senolytic research gets interesting and complicated. Some chemotherapy drugs \u003cem\u003einduce\u003c\/em\u003e senescence as a tumor-control mechanism, so clearing those senescent cells with a senolytic can theoretically work both for and against cancer outcomes. Fisetin itself has been studied as a candidate adjuvant in some preclinical models. \u003cem\u003eIf you have an active cancer diagnosis or are on chemotherapy, this decision belongs with your oncologist, not with this product page.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I open the capsule and mix the powder into a smoothie?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYou can, but fisetin is bitter and the piperine adds a peppery note. Most readers prefer to swallow the capsule whole and use a fatty meal as the absorption vehicle. If you do open it, mix into a fat-containing smoothie (Greek yogurt, nut butter, avocado, MCT oil) so the fat-soluble fisetin actually absorbs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes fisetin work for skin?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIndirectly, plausibly, slowly. Senescent fibroblasts and keratinocytes are part of the dermal-aging picture (Wang et al., \u003cem\u003eAging Cell\u003c\/em\u003e, 2017). Clearing them in animal models improves dermal collagen content and skin elasticity. Whether that translates to a measurable cosmetic effect in humans on the timescale most readers care about (weeks to a few months) is not established. If skin is your primary outcome, pair fisetin with \u003ca href=\"\/products\/marine-collagen-peptides-5000mg-skin-hair-joint-support\"\u003eMarine Collagen 5000mg\u003c\/a\u003e, \u003ca href=\"\/products\/liposomal-vitamin-c-1000mg-maximum-absorption-antioxidant-formula\"\u003eLiposomal Vitamin C\u003c\/a\u003e, and \u003ca href=\"\/products\/astaxanthin-12mg-120-softgels-antioxidant-skin-support\"\u003eAstaxanthin 12mg\u003c\/a\u003e rather than relying on fisetin alone.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes fisetin work for joints?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is one of the better-supported senolytic indications. Senescent chondrocytes accumulate in osteoarthritic cartilage, and the Wake Forest fisetin-OA trial (NCT04210986) is testing exactly that hypothesis in humans. Animal models show fisetin improves joint function and reduces cartilage damage in OA models (Zheng et al., \u003cem\u003eFASEB J\u003c\/em\u003e, 2018). The published human trial readout will tell us how strong the effect is. For now, joint comfort is one of the more frequently reported subjective benefits among long-term users.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVegan? Allergens?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes — fully vegan. The capsule is HPMC (vegetable cellulose), the fisetin is botanical (\u003cem\u003eRhus succedanea\u003c\/em\u003e), and the piperine is botanical (\u003cem\u003ePiper nigrum\u003c\/em\u003e). Free of soy, gluten, dairy, egg, fish, shellfish, tree nuts, and peanuts. Manufactured in a facility that handles tree nuts — if you have a severe nut allergy, contact us for the latest cross-contamination statement before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eRead more\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/news\/best-energy-supplements-for-fatigue\"\u003eWhy your “senescent-cell load” matters more than your age\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/news\/marine-collagen-vs-multi-collagen-which-helps-hair-and-skin-most\"\u003eThe longevity supplement stack we actually take\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/protocols\"\u003eTrue Health Protocols — full daily, weekly, and monthly cellular-longevity routines\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/longevity-essentials\"\u003eLongevity Essentials collection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/foundational-health\"\u003eFoundational Health collection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/antioxidants\"\u003eAntioxidants collection\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDisclaimer\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eThe references on this page point to published peer-reviewed research about the mechanisms studied for fisetin and senescent-cell biology. They are \u003cstrong\u003enot\u003c\/strong\u003e endorsements of this product by the cited researchers, their institutions, or the National Library of Medicine. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare provider before starting any new supplement — particularly if you are pregnant, breastfeeding, taking prescription medications (especially anticoagulants, antiplatelets, chemotherapy, or kinase inhibitors), or have a planned medical procedure.\u003c\/em\u003e\u003c\/p\u003e\n","brand":"True Health Protocol","offers":[{"title":"Default Title","offer_id":47839028543706,"sku":"THP-FISETIN-500-60","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0814\/5158\/1658\/files\/thp_fisetin.png?v=1778047677","url":"https:\/\/truehealthprotocol.health\/products\/fisetin-500mg-senolytic-flavonoid-for-cellular-cleanup","provider":"True Health Protocol","version":"1.0","type":"link"}