In fact, one study found that soy protein supplements did not produce the same positive results when compared with whey — suggesting that whey has some advantage over protein sources. (blog.nkdnutrition.com)
One group ate a normal diet while the other group took 60 gram soy protein supplements. (legionathletics.com)
Not to mention, the vast majority of soy protein supplements tend to be genetically modified. (gymjunkies.com)