Is Soy Protein Powder vegan?

Soy protein powder makes one of the best alternative protein sources for vegans seeking to avoid animal based products. Soy is the only complete protein, including all 9 essential amino acids necessary for a healthy diet.

Soy protein powder is only low in the amino acid Methionine, which is important for muscle development. Additional Methionine is sometimes added to soy protein powder to make up for the low concentration. Alternatively, Methionine is also found in high concentration in brazil nuts, oats, wheat, figs, whole grain rice and onions.