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Every other product on my list, I take daily. This one I deliberately don’t — and that’s actually the whole point of it. I’ve been taking Fisetin with Quercetin 1200mg, liposomal for better absorption, 60 softgels for over a year now, but in short, occasional bursts rather than as part of my everyday routine.
What fisetin actually is, and why the dosing is different
Fisetin is a flavonoid, found in small amounts in foods like strawberries, that’s become one of the most closely watched compounds in what’s called senolytic research — substances studied for their ability to selectively clear senescent cells, often nicknamed “zombie cells.” These are cells that have stopped dividing but don’t die off properly, and instead sit around releasing inflammatory signals that are thought to contribute to age-related tissue dysfunction. Fisetin appears to push these dysfunctional cells toward proper cell death (apoptosis) while leaving healthy cells largely alone, and it also has antioxidant and anti-inflammatory properties of its own.
Here’s the important part that makes this different from almost everything else I’ve written about: the research on senolytics generally uses pulsed, intermittent dosing rather than continuous daily use. The idea is that you take a meaningful dose over a short window to clear out existing senescent cells, then give your body an extended break before repeating the process, rather than maintaining a constant level the way you would with, say, a vitamin. Animal research and early human pilot studies have generally used protocols in the range of 1,000-1,500mg over two consecutive days, repeated periodically, rather than daily supplementation at lower doses (daily low-dose use is thought to provide general antioxidant benefits, but not the specific “clearance” effect the senolytic theory is built on).
How I take it, and why
This is exactly the protocol I’ve followed: three softgels at once, after my evening meal, three days in a row, once a month. Based on the dosing per softgel, that puts me in a similar range to what’s actually been studied for the pulsed senolytic effect, rather than a token daily dose that wouldn’t match the research at all. I’ve kept to this monthly rhythm consistently for over a year.
An honest word on the evidence
I want to be genuinely candid here, because I think this deserves more caution than most of what I’ve written about: fisetin’s senolytic effects are still primarily demonstrated in animal and cell-culture research. Small human pilot studies are underway looking at safety, tolerability, and optimal dosing, with early signs that it’s well tolerated even at meaningfully high doses, but there isn’t yet a large, definitive human trial confirming the “zombie cell clearance” effect translates the way the animal research suggests. I take it hoping the underlying theory holds up, and because the safety profile at this dosing pattern looks reasonable — but I’d be misleading you if I presented this as settled science the way I could with, say, creatine or vitamin D.
What I’ve noticed
I’ll be honest that this is one where I can’t point to a clear, tangible effect the way I can with something like magnesium and sleep, or NMN and energy. This is more of a long-term bet based on genuinely interesting science than something with an immediately felt result, and I think that’s worth saying plainly rather than inventing a story that isn’t there.
A quick safety note
Both fisetin and quercetin can affect how your liver processes certain medications, including blood thinners, statins, and other drugs with a narrow safe dosing range, so this is one where I’d especially recommend checking with your doctor first if you’re on regular medication. It’s also not something to take if you’re pregnant, undergoing cancer treatment, or immunosuppressed. GI discomfort at these higher pulsed doses is possible but tends to resolve once the short dosing window ends.
Should you try it?
If you’re drawn to the more speculative, research-forward end of longevity science and you want to follow the protocol that actually matches the studies (pulsed, not daily), fisetin is one of the more genuinely interesting options out there. Just go in understanding you’re betting on a promising but still-unproven theory in humans, not a guaranteed outcome.
