The skinny on the soy........................many believe that because of the estrogen "like" properties of some of its chemical components it would be good for the hair. I personally don't think it would effect aggressive hair loss.
As for the other protiens..............mix 'em up.......a general rule of thumb.....quick absorbing Whey immediatly after your work out..............slower absorbing (ie. Caseinate) at night to battle the catabolic fast that occurs while you sleep.
Steroids...............playin' Russian Roullette with the precious "still functioning" follicles, but I must admit I have given into temptation before, and they are effective, even for beginers. I think the quick results build quick enthusiasm and confidence and can keep one in the boring weight lifting game longer, as they see visible, quick results. Not all steroid gained muscle is lost, but it is discouraging on "non gear" months to see 50% of your "hard earned :lol: " muscle disappear. But you have to remember you still got (ball park) 25-30% more muscle than you would have with out the "stuff".