Quercetin is a flavonoid, a type of plant pigment found in many fruits, vegetables, and herbs. It is known for its antioxidant properties, which can help to protect the body against damage from harmful molecules known as free radicals.
In protein powders, quercetin is sometimes added as an ingredient to help support immune function and reduce inflammation. It is believed to work by blocking the release of histamine, a molecule involved in the inflammatory response, and by inhibiting the activity of enzymes that contribute to inflammation.
Quercetin is generally considered safe when consumed in the amounts found in food, and there is some evidence to suggest that it may have health benefits, such as reducing the risk of chronic diseases like heart disease and certain types of cancer. However, more research is needed to fully understand the potential health benefits of quercetin supplementation.