Vitamins can be classified based on their solubility.

Most are water-soluble, meaning they dissolve in water. In contrast, the fat-soluble vitamins are similar to oil and do not dissolve in water.

Fat-soluble vitamins are most abundant in high-fat foods and are much better absorbed into your bloodstream when you eat them with fat.

There are four fat-soluble vitamins in the human diet:

  • Vitamin A
  • Vitamin D
  • Vitamin E
  • Vitamin K

This article provides a comprehensive overview of the fat-soluble vitamins, their health benefits, functions and main dietary sources.