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Vitamin D ( Calciferol )
Cholecalciferol D3, Ergocalciferol D2
Cholecalciferol D3
An animal form of vitamin D, can be formed by the action of the suns UV light on skin to D3
Ergocalciferol D2
Plant form of vitamin D, compound found in fungi and yeast, when they are exposed to UV light, ergosterol is converted to Ergocalciferol
Effect of deficiency
Rickets in children-bones soft, weak, lead to bow legs, risk of fracture, Osteomalacia in adults- low bone mass due to loss of calcium, softening of bones, Osteoporosis in elderly and PMW-bones weaken, become brittle, fragile, tooth decay
Sources of cholecalciferol
Animal sources-fish liver oils, oily fish, eggs, margarine, milk
Sources of Ergocalciferol
Plant source-fungi, yeast
Properties of vitamin D
Fat soluble, insoluble in water, heat stable, unaffected by oxygen, acids, alkalis
RDA value of vitamin D
Children/Adult/Pregnancy/Lactation- 10ug Teen-15ug
Biological Functione
Healthy bones, calcification of teeth, aids absorption of calcium and phosphorus, controls level of calcium in blood, inhibits development of bone disorders