I used this product pre- and post-op and four months post-op developed a bleeding ulcer that kept me in ICU for four days. My surgeon (Ronnie Keith, D.O.) told me he thought I might be the second patient in his bariatric program to have such a GI problem due to this protein supplement. Other patients take this with no problems whatsoever. Unfortunately, there are as many opinions about the need for protein supplement as there are bariatric programs. My surgeon even disagreed on the amount of supplement needed with his program coordinator, who is also a registered dietician. It's a kooky business out there! Once I came home from the hospital, I threw away all my cans of Pure Whey Protein Stack and never looked back.
(indicates that they have used the product)