Histamine Block by Seeking Health contains a patented enzyme formula providing 10,000 HDU per capsule of diamine oxidase (DAO), the main enzyme responsible for the degradation of ingested histamine. Histamine is a biogenic amine, an organic nitrogen compound, involved in certain immune responses, and is found in mast cells. It may be involved in regulating healthy functioning in the GI tract and nervous system. Histamine also plays an important role in triggering the body’s normal inflammatory response. (An excess of histamine can be a problem, however, leading to histamine sensitivity or intolerance, digestive difficulties, allergies, and more.) Let Histamine Block dietary supplements take care of your histamine sensitivity or intolerance once and for all.* Seeking Health uses state-of-the-art manufacturing facilities adhering to strict standard operating procedures (SOPs), ensuring the integrity and efficacy of our products. Seeking Health produces high-quality, scientifically formulated supplements for people who want to optimize their health. In a world that is packed with toxins and stress, our true passion is prevention. Seeking Health’s founder, Dr. Ben Lynch—author of Dirty Genes—believes that vibrant health starts with the genes. With a research-backed foundation and bioavailable nutrients in easy-to-use formulas, Seeking Health enables you to live your optimal life. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.