Q.Which vitamin is synthesised by human skin?

Vitamins — Sources and Functions

You need proteins, carbohydrates and fats in large amounts — but you also need tiny quantities of certain organic compounds that the body mostly cannot make on its own. These are vitamins: micronutrients that don't give energy, yet without them essential body processes break down and deficiency diseases appear. Knowing each vitamin's source, job and deficiency disease is a compact, heavily tested topic.

The WHY — small amounts, big roles

Vitamins act mainly as coenzymes and regulators of chemical reactions. Because they are needed in such small amounts but cannot be synthesised (with a few exceptions), they must come from the diet. A shortage causes a specific deficiency disease.

Two families

Key vitamins — source, function, deficiency