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There are 13 well identified vitamins. Here are their sources, functions, and symptoms of deficiency.

Vitamin Source Function Deficiency
Vitamin A carotene from carrots and other vegetables, dairy products, liver, and fish-liver oil skin, mucous membranes, bones, vision, reproduction
skin dryness, dry mucous membranes
Vitamin B1
pork, organ meats, brewer's yeast, wheat germ, berries, nuts, legumes carbohydrate metabolism Beriberi - muscular weakness, swelling of the heart, and leg cramps.
Vitamin B2
liver, milk, meat, dark green vegetables, whole grain and enriched cereals, pasta, bread, and mushrooms metabolism of carbohydrates, fats, and respiratory proteins skin lesions and sensitivity to light
Vitamin B3
liver, poultry, meat, canned tuna and salmon, whole grain and enriched cereals, dried beans and peas, and nuts the release of energy from nutrients Pellagra - sunburn-like eruption of the skin.

Vitamin B6

whole grains, cereals, liver, avocados, spinach, and bananas. metabolism of amino acids, formation of red blood cells skin disorders, kidney stones.
Vitamin B12
liver, kidneys, meat, fish, eggs, and milk formation of proteins, red blood cells, and nervous system function anemia
Folic Acid
B vitamin
organ meats, leafy green vegetables, legumes, nuts, whole grains, and brewer's yeast forming body protein and hemoglobin, Prenatal development Neurological disorders
Pantothenic acid
B vitamin
abundant in food, manufactured by intestinal bacteria metabolism of proteins, carbohydrates, and fats unknown
B vitamin
abundant in food, manufactured by intestinal bacteria formation of fatty acids, carbohydrate energy release unknown
Vitamin C
Ascorbic Acid
citrus fruits, strawberries, cantaloupe, pineapple, broccoli, tomatoes, spinach, green peppers, cabbage, and turnips formation and maintenance of collagen which supports body structures, bones, and teeth Scurvy - hemorrhages, loosening of teeth, bone damage.
Vitamin D egg yolk, liver, tuna, fortified milk, and sunshine bone formation, retention of calcium and phosphorus Rickets - deformation of rib cage, skull, and bowlegs
Vitamin E vegetable oils, wheat germ, liver, and leafy green vegetables formation of red blood cells, muscles, and tissues unknown
Vitamin K alfalfa, fish livers, leafy green vegetables, soybean oil, and liver coagulation of blood blood clotting disorders