Definition: generic descriptor for all steroids exhibiting the biologic activity of ergocalciferol or cholecalciferol, the antirachitic vitamins popularly called the “sun-ray vitamins.” They promote the proper use of calcium and phosphorus, thereby producing growth, together with proper bone and tooth formation, in young children; the sulfate, a water-soluble conjugate, is found in the aqueous phase of human milk; vitamin D1 is a 1:1 mixture of lumisterol and vitamin D2.
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Examples: glitazone, GI cocktail, etc.