Nutrients

Soybeans are an excellent source of protein and molybdenum. They are a very good source of iron, calcium, phosphorus, and dietary fiber. They are a good source of vitamins B1, B2, B6, and E and folic acid. They also contain other health promoting compounds, including phytosterols, lecithin, isoflavones, phytoestrogens, and protease inhibitors. The amino acid profile of soy is a little low in methionine and tryptophan, but is still regarded as an excellent source of protein, soybeans (38% protein), soy flour (40 to 50% protein), soy protein concentrates (70% protein), and soy protein isolates (90 to 95% protein).