IP-6 (inositol hexaphosphate) is a component of certain dietary fibers, particularly most cereal grains, legumes, and seeds high in oil. Many researchers believe some of fiber's health benefits may be due to the antioxidant, immune-enhancing, and cardiovascular-supporting activities of IP-6. In-vitro and animal research has shown IP-6 to have significant protective and growth-regulating effects on certain cells and tissues, including those of the colon, breast, and prostate. Source Naturals IP-6 is free of other active ingredients. Only IP-6 in this form has consistently demonstrated positive research results.