I really wanted to love it- upsets my stomach

I am surprised that this protein powder has upset my stomach and made me throw up both the times I have had it. I was introduced to this by a friend. we shared one scoop in two smoothies. It was delicious. So I never felt it affecting my stomach. Anyone who is lifting regularly will naturally go for at least one full scoop. For years I have taken two scoops of Optimum Nutrition and never have I thrown up. just one scoop of the one, on two different occasions has given me severe diarrhea, non stop vomiting and nausea.

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