soy and whey protein.
because creatine is listed as a "supplement" and not a "drug" by the FDA (in the USA), makers of creatine are not held to any standards...some brands may be inadvertently cross-contaminated with anabolic steroidal agents...not a good thing.
My opinion...doesn't really matter...if you want to risk kidney damage & the possibility of taking an "illegal" steroid (by mistake) & failing a drug test...
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