Many B vitamins function individually or in combination with enzymes inside your body to help release energy from carbohydrates, fat and protein. Vitamin B coenzymes play an important role in generating the energy necessary for your body’s cells. They are co-dependent in their metabolic activities and a deficiency of one B vitamin can affect the functioning of organ systems.Niacin is the only B vitamin that can be synthesised in the liver from an amino acid. In its coenzyme forms, niacin is crucial for transforming food into energy. Niacin’s beneficial effects on blood lipids are well-documented.