All of the following vitamins are involved in sulphur containing amino acid metabolism except?

Vitamin B6, B9 and B12 are involved in sulphur containing amino acid metabolism. Vitamin B6 (Pyridoxine) is the co-enzyme of cystathionine b synthase. Vitamin B9 (Folic acid) and B12 (Cobalamin) are involved in the conversion of homocysteine to methionine by methionine synthase. Clinical impoance: Reference: Harpers illustrated biochemistry 30th edition