Vitamin D - Calciferols Formed by action of ultra violet light on fungi and yeasts Manufactured synthetically for use as vitamin supplement Cholecalciferol.

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Presentation transcript:

Vitamin D - Calciferols Formed by action of ultra violet light on fungi and yeasts Manufactured synthetically for use as vitamin supplement Cholecalciferol The sun activates 7 dehydrocholesterol present in fat under skin Ergocalciferol

Vitamin D -Calciferols Functions  Absorption and laying down of calcium and phosphorous in bones and teeth  Regulates calcium in the blood  Prevents rickets, osteomalacia and osteoporosis Effects of deficiency Rickets in children and Osteomalacia in adults Osteoporosis Dental caries Conditions where bones are soft and cannot take weight of the body Bones become light, less dense and prone to fractures

Vitamin D -Calciferols Sources Sunlight conversion Fish liver oils Dairy products Oily fish Margarine

Vitamin D -Calciferols Properties  Fat soluble  Insoluble in water  Stable to heat, acids, alkalis, oxygen  Unaffected by cooking or preservation RDA 5 -15µg per day See text book pg. 36