Breakouts have been known to happen with both whey and soy. Only way you can know for sure, is to try it, and if it breaks you out, now you know.
I find that my body is more important, than letting acne control me. I control me, not my face or acne...The acne will go away, and when it does, ill be cut and buff...ready to face the world with the knowledge ive gained from having acne, and the build to match.