I'm sure you have NEVER heard the term " your DAO gene is dirty" and let's be honest, if someone did, no-one would have any clue what that meant. DAO is the gene responsible for processing Histamine in your gut and It's a BIG deal, especially if you find yourself suffering from: - Car or sea sickness - Migraines or headaches - Red or sweaty palms - Eczema - Lots of food allergies - Sulfur smelling breath or stools - Diarrhoea - Exercise induced asthma - PMS - Alcohol intoler