Vitamins are classified based on their solubility:

1. Fat-Soluble: Vitamins $A,D,E,K$. These are stored in the liver and adipose tissue.
2. Water-Soluble: Vitamins of the $B$ complex and Vitamin C (Ascorbic Acid).

• Water-soluble vitamins are not stored in the body for long periods (except $B_{12}$) and must be supplied regularly in the diet because they are excreted in urine.
• Deficiency of Vitamin C leads to Scurvy.