Vitamins are organic substances in food which are required in small amount but cannot be synthesis in adequate quantities.

Classification of vitamins:

[A] Fat soluble vitamins:

  • Vitamin A (Retinol)
  • Vitamin D
  • Vitamin E
  • Vitamin K


[B] Water soluble vitamins:

  1. Vitamin-B complex:
  • Thiamine ( Vitamin
  • Riboflavin ( Vitamin
  • Niacin (Nicotinic acid and nicotinamide)
  • Pyridoxine (Vitamin
  • Pentathonic acid
  • Biotin
  • Vitamin and folate
  1. Vitamin-C (Ascorbic acid)



  • Davidson’s Principles and practice of Medicine, 21st edition

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