Quercetin as a cancer chemopreventive or chemotherapeutic agent: Where we stand

Abstract Quercetin has a wide range of potential health benefits, working as a direct or indirect agent or an adjuvant following different principles. It may be used as a generally useful or exclusive supplement, but also specifically used to treat an acute or chronic condition. Quercetin may work as a cancer chemopreventive and chemotherapeutic agent, because this versatile substance, which owns antioxidant and anti‐inflammatory properties, may also kill cancer cells and also holds senolytic properties. While both the specific chemo‐preventive or chemotherapeutic uses as a drug need clinical trials, it may be used without any contraindication as a general chemo‐preventive supplement.