Vitamins are organic substances that are essential for human health. Plants can produce most vitamins, while humans can only produce a few and must obtain the others from food. Vitamins help break down proteins and fats, allow the body to function properly, and help the body fight diseases. There are various types of vitamins including vitamins A, B, C, D, and E, and they can be water soluble or fat soluble. Deficiency in vitamins can lead to diseases such as night blindness, beriberi, pellagra, anemia, and rickets.