... . APPLICATIONS Riboflavin: A member of the vitamin B complex (water-soluble) including thiamine (vitamin B1), riboflavin (vitamin B2), riboflavin 5'- phosphate, nicotinic acid ... , pyridoxal, pyridoxamine), panthothenic acid (vitamin B3 or vitamin B5), inositol, p-aminobenzoic acid, biotin (vitamin B7), folic acid (vitamin B9), and vitamin B12 (cobalamins). Riboflavin is ...