Head to head
Fisetin against Quercetin
The two flavonoid senolytics people actually buy. A 2018 EBioMedicine paper, Fisetin is a senotherapeutic that extends health and lifespan, screened a panel of ten flavonoids for senolytic activity in cells, reported fisetin as the most potent of them, and then took that one into mice. That is where fisetin's reputation comes from, and the multi-site mouse programme built to replicate lifespan claims found no effect for it.
Column A
FisetinFisetin (senolytic flavonoid)
A plant flavonoid and leading natural senolytic. One mouse study reported extended lifespan; the multi-site programme built to replicate such results found no effect.
Column B
QuercetinQuercetin (senolytic flavonoid)
A dietary flavonoid used as a senolytic alongside dasatinib. It clears senescent cells in people; the randomised trials have not yet shown that this changes anything.
Side by side, on the facts we can check
| Attribute | Fisetin | Quercetin |
|---|---|---|
| Category | Longevity | Longevity |
| FDA status | Sold as a supplement; in clinical trials for aging | Sold as a supplement; used in senolytic research |
| Half-life | ~1-3 hours | ~11-28 hours |
| Molecular weight | 286.2 Da | 302.2 Da |
| Mechanism | Selectively triggers death of senescent cells, reducing the inflammatory signals they release. | Helps trigger death of senescent cells, particularly in combination with dasatinib, and reduces inflammatory signaling. |
| Human studies cited | 1 | 4 |
| Legal status, US | Sold as a dietary supplement | Sold as a dietary supplement |
Frequently asked questions
What is the difference between Fisetin and Quercetin?
Fisetin: A plant flavonoid and leading natural senolytic. One mouse study reported extended lifespan; the multi-site programme built to replicate such results found no effect. Quercetin: A dietary flavonoid used as a senolytic alongside dasatinib. It clears senescent cells in people; the randomised trials have not yet shown that this changes anything.
Which has stronger research evidence, Fisetin or Quercetin?
This database does not grade compounds. It counts what was run in people: 1 of the 3 studies cited on the Fisetin profile were human work, against 4 of 5 for Quercetin. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Fisetin and Quercetin FDA-approved?
Fisetin: Sold as a supplement; in clinical trials for aging. Quercetin: Sold as a supplement; used in senolytic research.
Related posts
Blog articles that cover Fisetin or Quercetin, newest first.
- Longevity / Sep 8, 2026 / 12 minPeptides for Longevity: What the Evidence Actually Shows in 2026
- Longevity / Sep 8, 2026 / 9 minSenolytics in 2026: Dasatinib plus Quercetin, Fisetin, and What Human Trials Have Shown
- Longevity / Sep 8, 2026 / 9 minThe Rapamycin Dosing Debate: What PEARL Tested, the Bioavailability Problem, and What Is Unproven
- Longevity / Sep 8, 2026 / 8 minKlotho Explained: Protein, Peptide, Gene Therapy or Supplement?
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.