Mechanism walk · Nutrition

How vitamin D walks calcium into bone

Skin, liver, kidney, then K2 steering calcium into bone.

5 scenes: skin → liver → kidney → K2 steering → calcium deposit

1. 01Sun → Skin
2. 02Liver · 25-hydroxylation
3. 03Kidney · 1α-activation
4. 04Bone · osteocalcin
5. 05Bone · deposit

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