VITAMIN A – a fat soluble vitamin or vitamin mixture found especially in animal products (as egg yolk, milk, or fish-liver oils) whose lack causes injury to epithelial tissues (as in the eye with resulting visual defects). It plays a role in maintaining normal vision, skin, reproductive function and protection against infection.
VITAMIN B COMPLEX a group of water-soluble vitamins found widely in foods that include essential coenzymes and growth factors – called also B complex; compare biotin, choline, nicotinic acid, panthothenic acid, thiamine.
VITAMIN B2 riboflavin
VITAMIN B6 pyridoxine or a closely related compound.
VITAMIN B12 a complex cobalt – containig member of vitamin B complex that occurs especially in liver, is essential to normal blood formation, neural function, and growth, and is used especially in treating pernicious anemia.
VITAMIN C a water soluble vitamin C6 H8 O6 that is present especially in fruits and leafty vegetables, apparently fucntions as an enzyme in certain bodily oxidations and synthesis, and in used medicinaly in the preventionand treatment of scurby – called also ascorbic acid.
VITAMIN D any or all of several fat-soluble vitamins that are chemically related to steroids, are essential for normal bone and tooth structure, and are found especially in fish-liver oils, egg yolk, and milk or produced by activation (as by ultraviolet irradiation) of sterols.
VITAMIN E any of several tocopherols of which the lack in various mammals and birds is associated with infertility, muscular dystrophy, or vascular abnormalities and which occur especially in leaves in seed germ oils.
VITAMIN K any of several fat-soluble vitamins essential for the clothing of blood because of their role in the production of prothrombin.