A simple way to find out if you have a DAO deficiency, that doesn’t require any testing, is by trying Umbrellux DAO enzyme supplements 15 to 30 minutes before eating the suspect food causing the reaction. If symptoms of stuffy or runny nose, itching, sneezing, headaches, hives and watery eyes are alleviated, this could quickly confirm a DAO deficiency. Self-evaluation sample kits can be purchased for only $2 at www.umbrelluxdao.com.