Soy protein is a complete protein that ranks right up there with the best in the Protein Digestibility Corrected Amino Acid Score (PDCAAS). Soy protein is generally very low in or free of fat, cholesterol, and lactose.  Soy protein powder is approved for those who are lactose intolerant, and can be used as a meat substitute. Much more than just an ingredient for a protein shake, Discount Soy protein can be used for cooking instead of flour, producing high protein foods that are extremely low in fat, a bodybuilder's dream come true! Soy protein is derived exclusively from soy beans.