Soy protein is a high quality, complete plant protein that is comparable to high quality animal protein (e.g., beef, milk, eggs). Soy protein is a lactose-free, cholesterol-free lean source of protein. It is a high quality protein that can be consumed throughout the life cycle. Protein quality is measured by assessing the amino acid content of the protein and the digestibility level. The current method for assessment is the Protein Digestibility-corrected Amino Acid Score (PDCAAS). PDCAAS is the methodology recommended by the Food and Agriculture Organization and the World Health Organization and has been in use since 1991.

As a primary source of protein, soy can help children and adults adequately meet their protein needs. Soy protein is unique in that it is the only complete source of vegetable protein widely available.