Okay so first of all, this stuff smells HORRIBLE. It smells like a cheez-it that has been soaked in water and left in a very hot humid car for hours on end. It clumps constantly and doesn't mix easily. BUT IT WAS A LIFESAVER. My daughter had negative reactions to breast milk (even with dietary changes), and all other types of formula. She had to be on medication just to get her acid to stop long enough to eat. Nutramigen decreased her gassy tummy and spit up. We used it up until their Toddler version and would recommend to others who are struggling finding a tummy friendly allergen friendly formula. It smells so bad but it must taste pretty good because my daughter drank it until she was 2 with no complaints or refusals.