Quercetin: One of Your Strongest Natural Defenses Against Heart Disease Cardiovascular disease remains the leading cause of death by disease, and one of the most powerful natural compounds for protecting the heart is quercetin. Quercetin is a flavonoid—a type of antioxidant polyphenol—found naturally in fruits and vegetables. A growing body of research confirms that quercetin plays a significant role in preventing cardiovascular disease and supporting overall metabolic and immune health. Large population studies consistently show that diets high in quercetin are associated with a lower risk of heart disease. Beyond population data, mechanistic and clinical research reveals how quercetin works at the cellular and vascular level. Eight Ways Quercetin Protects the Cardiovascular System 1. Improves Cholesterol Balance Human studies show that quercetin supplementation: Lowers total cholesterol Lowers LDL (“bad”) cholesterol Raises HDL (“good”) chol…