Quercetin and Fisetin: The Senolytic Pair Under Study

Senescent cells, sometimes called zombie cells, stop dividing but don't die, instead accumulating with age and secreting inflammatory signals that damage surrounding tissue. Senolytics are compounds designed to selectively clear these cells, and quercetin and fisetin, two naturally occurring flavonoids found in foods like onions, apples, and strawberries, are among the most studied natural candidates for this effect.

Animal studies combining quercetin with the cancer drug dasatinib have shown senolytic effects and improved physical function in aged mice, and fisetin alone has shown similar effects in some rodent models. Human trials remain in early stages, generally small and short-duration, testing safety and preliminary markers rather than long-term healthspan outcomes, so the translation from promising rodent senolytic data to proven human benefit is still very much a work in progress.

Why this matters for tracking: quercetin and fisetin represent some of the most accessible entry points into senolytic research, since both are available as supplements, though the human trial data trails well behind the animal studies driving the interest.