Medical Definition of folic acid
: a crystalline vitamin C19H19N7O6 of the B complex that is required for normal production of red blood cells, that is used especially in the treatment of nutritional anemias, and that occurs especially in green leafy vegetables, liver, kidneys, dried beans, and mushrooms—called also folacin, folate, Lactobacillus casei factor, pteroylglutamic acid, vitamin Bc, vitamin M
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