Vitamin Requirements of Humans and their Deficiency Symptoms

AIPMT-NEET Biology Aspirants, read out the next AIPMT-NEET Biology Study material/ Notes about Vitamins -their major food sources, major functions in human body and what are the diseases related to deficiency of vitamins, important for AIPMT-NEET Biology. Free online notes for AIPMT-NEET.

B-complex Vitamins and Vitamin C are Water-soluble vitamins, while Vitamin A, D, E, K are Fat-soluble vitamins.

Vitamin Major Sources Major Functions in the Body Deficiency Symptoms/ Diseases
Water-Soluble Vitamins
Vitamin B1(thiamine) Legumes, whole grains, potatoes, Coenzyme in CO2 removal during cellular Beriberi (fatigue, nerve disorders, anemia), loss of appetite, weakening of heart
Vitamin B2 (riboflavin) Dairy products, meats, enriched, grains, vegetables Component of coenzymes FAD and FMN Inflammation and breakdown of skin such as cracks at corners of mouth, eye irritation
Vitamin B3 (niacin) Liver, lean meats, grains, nuts Component of coenzymes NAD+ and NADP+ Pellagra , inflammation of nerves, mental disorders
Vitamin B5 (pantothenic acid) Liver, eggs, yeast Part of coenzyme-A, a key connection between carbohydrate and fat metabolism Loss of coordination; tingling of hands and feet; adrenal problems, reproductive problem
Vitamin B6 (pyridoxine) Cereals, vegetables, meats Coenzyme used in amino acid metabolism Irritability, convulsions, muscular twitching, anemia
Vitamin B7 (biotin) Meat, vegetables, legumes Coenzyme in fat synthesis, glycogen and amino acid metabolism Loss of hair, Scaly skin inflammation, neuromuscular disorders
Vitamin B9 (folic acid) Green vegetables, oranges, nuts, legumes, whole grains, also synthesized by bacteria in intestine Coenzyme in nucleic acid and amino acid metabolism Anemia, birth defects
Vitamin B12 (cyanocobalamin) Red meats, eggs, dairy products, also synthesized by bacteria in intestine Coenzyme in the production of nucleic acids and in formation of red blood cells Pernicious anemia, numbness, loss of balance
Vitamin C (ascorbic acid) Citrus fruits, broccoli, tomatoes, cabbage, green peppers Used in collagen synthesis; antioxidant; improves absorption of iron Scurvy (degeneration of skin and teeth, breakdown of skin, delayed wound healing
Fat-Soluble Vitamins
Vitamin A (retinol) Green vegetables, milk products, liver Component of visual pigments; maintenance of epithelial tissues Night blindness, flaky skin
Vitamin D(calciferol) Fortified milk, cod liver oil, egg yolk; also synthesized in skin exposed to sunlight Increases absorption of calcium and promotes bone formation; absorption of phosphorus Rickets (bone deformities) in children, bone softening in adults
Vitamin E (tocopherol) Whole grains, nuts, seeds Antioxidant; helps prevent damage to cell membranes; muscle maintenance Nervous system degeneration
Vitamin K (phylloquinone) Intestinal bacteria, liver, green leafy vegetables Essential to blood clotting Blood clotting problems
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