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Vitamins 

“small organic molecules present in diet which are required in small amounts.”

• Most of the vitamins are not synthesized in the body and hence they must be supplied in the diet. How ever few vitamins are synthesized in the body. Though most of them are present in diet as such some are present as precursors. The precursor forms of vitamins are called as provitamins. In the body these provitamins are converted to vitamins.
Vitamins are divided into two groups. 
1. fat soluble VITAMIN 
2. water soluble vitamins.
 1. Fat Soluble Vitamins
They are vitamins A, D, E and K. They have some common properties.
1. Fat soluble.

2. Require bile salts for absorption.

3. Stored in liver.

4. Stable to normal cooking conditions.

5. Excreted in feces.

2. Water Soluble Vitamins:
They are members of vitamin B complex and Vitamin C. Their common properties are
1. Water solubility.

2. Except Vitamin B others are not stored.

3. Unstable to normal cooking conditions.

4. Excreted in urine.
Read more.. https://www.worldhealthkit.com/vitamins/