Inosine is a nucleoside, one of the basic compounds comprising cells. Each GP Inosine capsule contains 200 mg of Inosine. It is a precursor to adenosine, an important energy molecule, and plays many supportive roles in the body. Inosine is a precursor to uric acid, a compound that occurs naturally in the body. Uric acid is believed to block the effect of a toxic free-radical compound (peroxynitrite) that may play a role in the development of multiple sclerosis.