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vitamin A either of two, or a mixture of two, hydrocarbon compounds found in fruits, vegetables, and dairy products, required in human nutrition for producing the vision pigments of the eye and for maintaining the membranes of the body.
vitamin B see vitamin B complex. [2 definitions]
vitamin B complex a group of vitamins essential in human nutrition, found mainly in eggs, liver, yeast, and certain vegetables.
vitamin b1 thiamine.
vitamin b12 a compound found in meat, milk, eggs, and other animal products, required in human nutrition for producing red blood cells and maintaining nerves and muscles; cobalamin.
vitamin B2 riboflavin.
vitamin b3 niacin.
vitamin b6 a compound found in meats, green vegetables, and whole grains, required in human nutrition for metabolism; pyridoxine.
vitamin C ascorbic acid.
vitamin D in human nutrition, a sterol produced in the liver, or any of several closely related sterols found in fish, eggs, or fortified milk, required for proper bone development and calcium absorption.
vitamin E a compound found in vegetable oils and whole grains, required in human nutrition for the maintenance of blood cells, membranes, and liver and brain tissue; tocopherol.
vitamin K in human nutrition, a substance produced in the intestines by bacteria, or acquired in the diet from milk or green vegetables, required for the synthesis of blood-clotting proteins.
vitamin P bioflavonoid.