A pyridoxamine derivative of vinyl glyoxylate remains after the gamma elimination. The 3'-hydroxyl group of pyridoxamine allows for efficient hydroxyl radical scavenging. In the process, the cofactor shuttles between PLP and the pyridoxamine phosphate (PMP) form. The trapped pyridoxine and pyridoxamine are oxidized to pyridoxal phosphate in the tissue. Pyridoxamine was marketed as a dietary supplement, often as the hydrochloride salt, pyridoxamine dihydrochloride.