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Coenzymated Vitamin B2Energy and Metabolism50 mg Per CapsuleVitamin SupplementVegetarian Delivers B2 Directly in Its Active form So It's Ready to PerformEssential for Cellular Energy MetabolismScience-Backed Quality Since 1969Like many other B-complex vitamins riboflavin must be converted into its active form to be utilized by your cells hence the importance of riboflavin 5'-phosphate supplements. In the human body this process takes place in the cellular mitochondria when dietary riboflavin is converted by the enzyme riboflavin kinase into riboflavin 5’-phosphate (R5P) which is the principal form of riboflavin found in cells and tissues. Swanson Ultra R-5-P lets your body sidestep this process by delivering the vitamin directly in its active form so it’s ready to perform its vital functions in cellular energy metabolism.