It is a very good source of protein B vitamins and minerals. Tofu - also known as bean curd is made from soya milk by coagulating the soya proteins with calcium or magnesium salts. The whey is discarded and the curds are processed.Our soya bean is a significant source of iron calcium and soya protein. It is also a good source of omega-3 fatty acids dietary fiber vitamin b2 magnesium vitamin k and potassium.