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