What Are Senescent Cells?
As we age, cells that have stopped dividing but haven’t died accumulate in our tissues. These “zombie cells” (senescent cells) secrete inflammatory signals (the SASP — senescence-associated secretory phenotype) that damage surrounding tissue, contribute to age-related diseases and accelerate systemic aging. Animal studies removing senescent cells dramatically improve healthspan and lifespan.
Senolytic Drugs vs Supplements
The most studied senolytics are pharmaceutical: dasatinib (a cancer drug) + quercetin, and navitoclax. These have shown impressive results in animal models and small human trials. However, they’re prescription drugs with significant side effect profiles — not something to take without medical supervision.
Over-the-Counter Senolytics
Several compounds available as supplements have senolytic activity in cell and animal studies: quercetin, fisetin, luteolin, and piperlongumine. Human evidence is very limited. Fisetin has attracted attention after a Mayo Clinic trial — but the doses used (20mg/kg, pulsed dosing) are far higher than typical supplement doses. A 70kg person would need ~1,400mg in a single dose, well above any retail product.
The Bottom Line
The science of senolytics is genuinely exciting, but translating mouse results to practical human benefit via off-the-shelf supplements is premature. Pulsed high-dose fisetin or quercetin (under medical supervision) is the most evidence-adjacent approach. Standard supplement doses are likely insufficient for meaningful senolytic activity.
⚕️ Senolytic research is early-stage. Consult a specialist longevity physician before attempting any senolytic protocol.