Soy Protein Isolate is a good vegetable source of high-quality complete protein that has an excellent amino acid profile. Soy products, including soy protein, have naturally occurring phytoestrogens and beneficial proteins such as genistein and daidzein. Make sure youre getting the basic building blocks of good health with high-quality Soy Protein Isolate from NOW. Diets low in saturated fat and cholesterol that include 25 grams of soy protein a day may reduce the risk of heart disease. One serving of NOW Soy Protein Isolate Powder provides 25 grams of soy protein.