* Gluten Free! * Non-GMO Vegetarian Capsules * Herbal Supplement We have combined freeze-dried organic Nettle and other scientifically researched ingredients to complete this formula. Preliminary research suggests that the flavonoid Quercetin inhibits the production of histamines in the body. Studies also show that the efficacy of Quercetin is boosted when combined with vitamin C. The inclusion of N-Acetyl Cysteine (NAC) offers the ability to break down mucous and helps normal cell function and liver function. N-Acetyl Cysteine is an altered form of the amino acid cysteine and is not provided by our diet. Quercetin, vitamin C and NAC also possess antioxidant activity.