I don't worry about back acne... I'm not THAT vain (except for the size of my muscles ), but then I've never gotten much in the way of pimples.

I was more concerned about a drop in size/strength as one compound was phased out and another one was introduced. I know they're "the same" for all practical purposes, but didn't know if it would take another few weeks for the new compound to be felt.

Thanks all,

-BigLittleTim