There are two types of vitamins. These are fat and water-soluble vitamins. Fat-soluble vitamins can only be utilized in the body if there is fat in the diet. Water-soluble vitamins can only be utilized when water is present in the diet.

There are four fat-soluble vitamins, also known as lipid soluble vitamins, and these include:

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

These vitamins are related to each other structurally and all are necessary in the body so that the body can maintain its daily repair as well as keep the organs functioning properly. These vitamins are stored in the body's fat and are dissolved in the body fat. This is different from water-soluble vitamins, as water-soluble vitamins only dissolve in water and are not stored in the body.

A person absorbs their fat-soluble vitamins in the intestines. Those individuals who have some sort of disease of the intestine are unable to absorb these vitamins properly and this typically leads to a vitamin deficiency. Fat-soluble vitamins can be found in fatty foods including fish-liver oils. Fish-liver oils are particularly rich in vitamin A and D. Vitamins A and D are also stored in the human liver where it is stored and used as needed.

People require nine water-soluble vitamins. These are eight B vitamins and vitamin C and include:

• Vitamin B1
• Vitamin B2
• Vitamin B3
• Vitamin B5
• Vitamin B6
• Vitamin B7
• Vitamin B9
• Vitamin B12
• Vitamin C

The water-soluble vitamins are inactive in their "free states" and are not stored in the body, so you must replace them on a daily basis. It is easy to do this through a high-quality multivitamin. These water-soluble vitamins are absorbed directly by the intestine and then go straight to the blood. Water-soluble vitamins are lost through the urine on a daily basis. This prevents the body from over-dosing on vitamins, but we must also replace these vitamins on a daily basis. Look for vitamins with high quality ingredients.