Soy Protein vs Whey Protein for Building Lean Muscle Mass
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I keep hearing that soy protein is bad for men because it can increase estrogen levels but then I see some vegan bodybuilders who are absolutely huge. I am wondering if this is just an old myth or if there is some truth to it.
I am considering adding some soy protein isolate to my routine to save some money because whey is getting so expensive here in the UK. Do you think it is safe to use as a primary protein source? I am mostly focused on building lean muscle and staying healthy.
I would love to see some actual evidence or hear from guys who have used soy for a long time. Did you notice any negative side effects or did it work just as well as whey? I am trying to keep an open mind and make the best decision for my physique.