There are 13 essential vitamins needed for normal cell function, growth, and development. Each of the vitamins has an important job and is required for the body to function properly. Vitamin D can be synthesised by the skin when it is exposed to sunlight but most vitamins cannot be made by the body. Vitamin deficiency can cause health problems so it is important to ensure you get enough of the essential vitamins by eating a balanced and varied diet.
Vitamins are grouped into two categories:

Water-Soluble Vitamins.
• Thiamin (vitamin B1)
• Riboflavin (vitamin B2)
• Niacin (vitamin B3)
• Pantothenic acid
• Vitamin B6
• Biotin (vitamin B7)
• Folic acid
• Vitamin B12
• Vitamin C

The nine water-soluble vitamins are directly absorbed into the bloodstream. Vitamin B12 is stored in the liver but the other vitamins cannot be stored in the body and are passed through our urine. Our bodies require a continuous daily supply of them.

Fat-Soluble Vitamins.
• Vitamin A
• Vitamin D
• Vitamin E
• Vitamin K

The four fat-soluble vitamins are dissolved in lipids (fats) before they are absorbed into the bloodstream. Once absorbed into the body, they are stored in fatty tissues and the liver. They stay in the body for longer..