soy protein

It isn't that it has estrogen in it, but rather that soy acts as a (rather weak) estrogen in the body. This is, soy contains phytoestrogens.

Soy protein is not the best option for those wanting to gain muscle mass.

Soy has a biological value of 74 I think. Egg is 100. Whey is higher than 100.

But I'm no expert on the BV thing so don't quote me on that.
 
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