Across all published fisetin clinical trials to date, no dose-limiting toxicities have been identified at the 20 mg/kg burst dosing protocol. Mild GI symptoms (nausea, loose stools) affect approximately 10% of users at higher doses. Theoretical drug interactions exist with anticoagulants and CYP3A4-metabolized drugs.

Can I take fisetin if I'm on blood thinners?

Use caution and inform your physician. The additive antiplatelet effect of fisetin with anticoagulant drugs creates a theoretical bleeding risk. Dosing adjustments or increased INR monitoring may be warranted.

Is fisetin safe for the kidneys?

Preclinical data is reassuring — fisetin has kidney-protective rather than nephrotoxic effects in most models. Clinical trials in kidney disease (NCT04537702) have not reported adverse renal events.