Vitamin is an organic molecule or chemical compounds that is an important micronutrient which is required to act properly in limited amounts for the digestion of the organism. Vitamins are either water-soluble or fat-soluble. Many vitamins do not exist in individual molecules, but belong to similar classes known as vitamers. The multiple functions of vitamin A are essential for growth and development, immune system maintenance and good vision. This vitamin is essential for proper vision by incorporating retinal molecules that absorb light and work during dim light and color differentiation. Due to the unusual role of the retinal as a visual chromophore, vision loss, especially in reduced light. Vitamin D belongs to a class of fat-soluble secosteroids that enhance the absorption of calcium, magnesium and phosphate by the lower intestine and other biological effects. Diet vitamin D is biologically inactive or derived from the synthesis of the skin. Vitamin D controls calcium homeostasis and its metabolism. Vitamin E is a fat-soluble antioxidant that inhibits reactive oxygen species from cell membrane protection. Several biological roles have been postulated, including a fat-soluble antioxidant. Vitamin E serves as a radical scavenger and supplies free radicals with hydrogen (H) atoms. Vitamin K refers to fat-soluble vitamins present in fruit and sold for structurally similar dietary products. For the modulation of certain blood-coagulation proteins or the control of calcium binding in bones and other tissues, the human body requires vitamin K.