Soy Pro Isolate is the latest that soy has come. I think you meant estrogen and It does. What they do now is advertise it as "gender specific" meaning that men will get the testosterone blood levels up and woman will get estrogen. I don't buy it so I stick to whey, casein and egg proteins. The people who use it are mostly woman or vegetarians. Not many bodybuilders. It's used in allot of bars and in some blended protein powers so read labels. It mixes much better than the old soy, but I'm sticking with the old school proteins.
Soy is an "old-school" protein. Bodybuilders have been using it since the 60s and 70s (at least). I've used it, on an off, since the late 80s, as a number of weight-gainers had soy as one of its primary proteins. I also used it, when I couldn't affoard milk-and-egg or egg protein powders. Back then, it was marketed under the name, Supro (which was soy protein isolate).
In fact, it still is today. More recently, I've purchased GNC's Soy & Whey Protein, when it was marked down. Except for the standard gritty composition, it tastes fairly good and works well.
Bill Pearl and Arnold Schwarzenegger were two legends, who used this type of protein frequently, especially Pearl, when he went vegetarian. Judging by the way he looked at the 1971 NABBA Mr. Universe, it's safe that one need not fear being feminized by using such soy protein.
