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Natural Factors BioCoenzymated Riboflavin 5'-phosphate 50mg B2 - 30 vegetarian capsules Natural Factors Riboflavin 5’-Phosphate is an innovative one-a-day formula that provides 50 mg of bioactive vitamin B2 to support energy metabolism alongside Farm Fresh Factors bioenergetic blend of phytonutrients. This biocoenzymated form of vitamin B2 is readily usable by cells and supports the conversion and activation of nutrients including folate and vitamin B6. Feel the difference!.