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B-Carotene important antioxidant
Found in plants
Retinoic acid regulates growth of cells (acne treatment)
Toxic: Hypervitaminosis A, congenital defects
Calcium homeostasis: Increase calcium in blood,
increase bone resorption,
increase calcium absorption from intestine,
increase calcium reabsorption from kiney
Free radical scavenger protects vit E and A
Coenzyme in hydroxylation reactions- collagen synthesis
Keeps Fe2+ reduced in gut allowing iron absorption
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