There are mainly two types of vitamins classified based on their solubility.
Fat soluble and water soluble vitamins
There are fat-soluble and water-soluble vitamins.
Fat-soluble vitamins are stored in the fat tissues of our bodies, as well as the liver. Fat-soluble vitamins are easier to store than water-soluble ones, and can stay in the body as reserves for days, some of them for months.1
Fat-soluble vitamins are absorbed through the intestinal tract with the help of fats (lipids).
Water-soluble vitamins do not get stored in the body for long - they soon get expelled through urine.
Water-soluble vitamins need to be replaced more often than fat-soluble ones.
Vitamins A, D, E and K are fat-soluble.
Vitamins C and all the B vitamins are water-soluble.2