Quercetin is a type of flavonoid antioxidant that is found in plant foods, including leafy greens, tomatoes, broccoli and berries. Quercetin plays a huge role in fighting free radical damage, the effects of aging and inflammation. Histamines are chemicals that are released when the immune system detects an allergy or sensitivity, and they cause uncomfortable symptoms – runny nose, coughing, itchy skin, hives, swollen lips and so forth. Quercetin is a natural anti-histamine making it able to assist the body with seasonal allergies, food allergies, asthma and skin reactions. The anti-inflammatory properties ease the discomforts and pain caused by allergies.Ester-C is essentially a highly PH neural and absorbable form of Vitamin C. This makes less irritating for your digestive trace. Solgar’s patented ingredients allow the Vitamin C to also be properly metabolized, whilst also being easily digested. Vitamin C has many positive benefits for our immune systems. It can be taken to fight off colds and flus as well as hayfever. Blood pressure levels can also be lowered while supplementing on Ester-C. Combining Quercetin and Ester-C makes this a powerful immune booster.