Most metabolic processes require vitamins.
Many coenzymes are composed of vitamins that help enzymes function.
Vitamins do not supply energy.
But it functions as coenzyme in the release of energy from carbohydrate,protein and fat.
Some vitamins are known as precursors (inactive in food,but converted into active in the body).
Body needs vitamins in small amounts (e.g. Milligram (mg)µgram (ug)).
If needs regularly.