Gastroaid Digestive Gastroaid Is A Health Supplement That Can Help Alleviate Behavioural Symptons Asssociated With Gastric Ulcers And Hindgut Acidosis As Well As Maintin Healthy Function In Your Horse. Gastroaid Helps With Picky Eating, Lack Of Energy, Weight Loss And Suspect Back Pain. Digestive Is A Powder Designed To Be Used Initially When The Symptons Of Digestive Issues Are Noticed. It Forms A Protective Gel Lining On The Stomach Wall And Protects The Horse From Further Damage.