Quercetin and Bromelain are both natural compounds that have been studied for their potential health benefits. When combined, these substances are believed to synergistically enhance each other's effects, providing a more potent benefit to the user. Quercetin is a flavonoid found in many fruits and vegetables, including onions, apples and berries. It's known for its antioxidant properties. Bromelain is a mixture of enzymes found in the stem and fruit of the pineapple plant Together, they offer enhanced antioxidant properties. This combination can support immune defenses and promote respiratory health.