Riboflavin 5'-PhosphateTHORNE Riboflavin 5' Phosphate delivers 36. 5mg of vitamin B2 in its bioactive, tissue ready form that the body can utilize directly without conversion. Unlike standard riboflavin supplements, this formula provides riboflavin 5' phosphate sodium, the active form that bypasses the body's conversion process. Not derived from yeast, it is suitable for individuals with sensitivities or absorption challenges. Riboflavin plays a crucial role as a cofactor