1. Vitamins are organic substances. 

2. They are micro – nutrients required in small quantities. 

3. Actually vitamins are not synthesised in the body and therefore they are essential nutrients.

4. Though our body cannot synthesis vitamins we do not generally suffer from vitamindeficiency disease.

5. This is because of two sources of vitamins for our body. Diet is the primary source. 

6. In addition, bacteria present in the intestine synthesis vitamins and supply them to us 

7. By themselves vitamins cannot generate any energy or carryout any chemical reaction. 

8. In the body vitamins combine with some of the enzymes and make the enzymes active. 

9. In the absence of vitamins, enzymes become inactive and cannot catalyse the reactions.

10. Vitamins are normally present in all types of natural foods – milk, meat, fruits and vegetables. 

11. Vitamins are of two types: 

1. Water soluble vitamins eg: B complex and Vitamin C and 

2. Fat soluble vitamins eg: A, D, E and K.