Which Vitamin is involved in Redox reactions?

Riboflavin is involved in redox reactions. Co-enzyme Activity of Riboflavin: Riboflavin exists in tissues tightly bound (but not covalently) with enzymes. Enzymes containing riboflavin are called flavoproteins. The two coenzymes are FMN (flavin mononucleotide) and FAD (flavin adenine dinucleotide) (Fig. 34.4). A. FAD Accepts Hydrogen During the oxidation process, FAD accepts two hydrogen atoms from substrate. In turn, FAD is reduced to FADH2. The two nitrogen atoms of the isoalloxazine nucleus accept the hydrogen atoms Reference: Vasudevan Textbook of Biochemistry pg no. 393