Vitamins are organic compounds and are essential nutrients for the body as it is unable to synthesize them on its own. Vitamins can be of two types: water-soluble and fat-soluble.
The water-soluble vitamins dissolve in water and are not stored by our body, so they must be taken regularly because the excess quantities are eliminated through the urine. All B vitamins and vitamin C (ascorbic acid) are water-soluble.
The fat-soluble vitamins dissolve in fats and can be stored inside our body to be used when needed. Vitamins A, D, E and K belong to this group. Of these, only vitamin D can be synthesized by our body with exposure to sunlight, while the others must be introduced with food.