vitamin b functions

• Vitamin B1 has a central role in energy-yielding metabolism, especially carbohydrate metabolism.
• Vitamin B2 has a central role in energy-yielding metabolism, and is involved in lipid and carbohydrate metabolism.
• Vitamin B3 is not necessarily a vitamin because it can be synthesised from tryptophan.
• Vitamin B3 has a role in metabolic function through the synthesis of the coenzymes NAD and NADP.
• Vitamin B3 deficiency or tryptophan deficiency can cause pellagra. Symptoms include photosensitive dermatitis, diarrhoea, dementia and death if left untreated.
• Vitamin B5 is part of the molecular structure of Coenzyme A and Acyl Carrier Protein (ACP).
• The active coenzyme of Vitamin B6 is pyridoxal 5'-phosphate, which is important in amino acid and glycogen metabolism and steroid hormone action.
• Biotin is cleaved from biocytin in foods by intestinal microflora.
• Vitamin B7 is a coenzyme of carboxylase enzymes, making it important in metabolism and blood glucose balance.