O

Bone trabeculae Hydroxyapatite crystals

Bone trabeculae Hydroxyapatite crystals

Ca10(PO4)6(OH)2

Ca10(PO4)6(OH)2

Skin

25-Hydroxychole-

calciferol

(calcifediol)

Cod liver oilO

Cholecalciferol (vitamin D3) 50-5000^g/day

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