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What is Soy Protein?Soy Protein Isolate is a concentrated source of high-quality soy protein. Soy Protein Isolate supplies the necessary amino acids, including the essential amino acids, to help support muscle growth. In fact, research shows that Soy Protein Isolate is just as effective as whey protein for building muscle. Soy Protein Isolate provides Glutamine and Arginine, two amino acids associated with hormone release and immune function. Soy Protein Isolate also contains naturally-occurring antioxidants.