Doctor's Best Fisetin with Novusetin contains a naturally sourced flavonol that displays positive effects on brain cells and cognitive function pathways in preclinical research. Fisetin is a bioflavonoid antioxidant that can help maintain glutathione levels and mitochondrial function in the presence of oxidative stress. It has potential to cross the blood brain barrier, which may help maintain neuronal function. Other than strawberries, fisetin is scarce in fruits and vegetables compared to other flavonoids, making Doctor's Best Fisetin a most reliable source of this powerful antioxidant and potential nootropic.