all i know is that i was drinking ensure for a long time trying to put some weight on and it was causing really bad chest pain and tightness. glucerna, (sugarfree ensure) did the same thing. i'd be careful with the shakes especially if they contain milk ingredients. but of course, why not try one and see if it affects you personally. it's the only way to know - we all have different bodies and reactions. my best to you.