In the body, through flavokinase and FAD synthetase, riboflavin is converted to its active forms, flavin mononucleotide (FMN) first, and then flavin adenine dinucleotide (FAD), which are essential for the synthesis of various compounds, including niacin, folic acid, vitamin B6, and heme proteins (1, 11, 43)
doi: 10.1152/physrev.00040.2012 28 NandiAYanLJJanaCKDasN
This equals: one 12-ounce regular beer (5% ABV), one 5-ounce glass of wine (12% ABV), one 1.5-ounce shot of distilled spirits (40% ABV), or one 8-ounce malt liquor (7% ABV)
Tell your doctor right away if you experience any of the following: Muscle cramps Weakness Irregular heartbeat Seek immediate medical attention if you experience an allergic reaction