Quercetin is a flavonol (a subclass of flavonoids) and is a potent antioxidant, providing cardiovascular protection by reducing oxidation of LDL cholesterol. Quercetin is one half of the rutin molecule, another flavonol, and is the more active antioxidant.
Quercetin supports cellular health and function. In human cell culture studies, it has been shown to block the manufacture and release of inflammation-causing substances,1,2 which can help support a healthy immune response to the seasonally changing environment. It also helps promote a healthy cardiovascular system by preserving endothelial integrity3 and supporting healthy blood glucose levels for those already within normal range.4