I have been using Hista resist for several months and it has been a game changer.After years of not being able to breathe through both nostrils , blowing my nose countless times a day, sneezing fits , itchy skin all over my body , just to name a few symptoms- all have subsided . I recommend this product to my customers as I work for the last 25 years for a nutritional pharmacy in New York City . We sell DAO alone but this product is so much more complete and despite the price you would spend as ...