This vitamin is part of the coenzyme FMN and FAD needed in energy metabolism
Vitamins. THIAMIN-B1 Chief Functions in the Body: Part of the coenzyme TPP(thiamin pryophosphate) used in energy metabolism. RIBOFLAVIN-B2 Chief Functions in the Body: Part of coenzymes FMN(flavin mononucleotide) and FAD(flavin adenine dinucleotide) used in energy metabolism.