Quercetin is a bioflavonoid common in the plant kingdom, especially high in onions, red wine, and green tea. It is one of the most biologically active bioflavonoids. Quercetin acts as a potent polyphenol antioxidant and immune system modulator.* Many of its immune support attributes are enhanced by its synergistic relationship with vitamin C. Quercetin is highly active in the skin and lining of the digestive tract.*

Quercetin has a stabilizing effect on the immune system, helping various types of immune cells maintain their composure under stress.* This helps provide tolerance for irritants such as pollen.* Quercetin is known to modulate the behavior of the gene signal NF-kappaB, the crucial signal determining how a cell naturally manages stress and inflammation.*

Quercetin interacts with bones at a fundamental level (NF-kappaB), favorably influencing the behavior of both osteoblasts (bone building cells) and osteoclasts.* Quercetin is one more natural compound that assists optimal bone health.*

Quercetin provides a variety of immune support features.* It has a modulating effect on immune system signals, helping to calm down inappropriate excess.* It helps to nourish mast cells so they are more stable and less likely to release histamine.* As such, Quercetin is a popular support nutrient for mild reactions to seasonal pollens and other irritants.* It is also known to enhance macrophage function, assisting lymphatic function.* Quercetin, Immune PlusTM, and Oregano Oil is our most popular combination for natural sinus support.*

Quercetin is also in Leptin Control Pack® (500 mg), Repair PlusTM (100 mg), and Preventor PlusTM (100 mg)