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General description	- fat - soluble vitamin
Found	- fish - liver - milk - cheese - butter - eggs
Anti-aging role	- vision - potent stimulator of growth hormone production - skin (acne, psoriasis) - bones - reproductive organs - boosting immunity (enhance TH2) - protect against cancer - healthy thyroid function
Deficiency symptoms	- night blidness or loss of adaptation to the dark - dry eye disease, sty in the eye - increased susceptibility to infection (sinus and bronchial infection) - drying out of skin and mucous membranes - loss of the teste and smell - loss of vigor - defective teeth and gums - slow growth
Therapeutic doses	7000 - 10 000 IU. RDA for men - 3000 IU (900 mcg) RDA for women - 2300 IU (700mcg) European RDA - 800 mcg
Maximum safe level	3000 mcg - long - term usage 7500 mcg (25 000 IU) - short - term usage People over the age sixty - five and those with liver disease are advised to take no more than 15 000 IU
Side effects	- birth defects - reduction in bone mineral density - increase blood lipids
Interactions	- isotretinoin - resorcinol - topical sulfur - tazarotene

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