Different issues: D3: a derivative of cholesterol converted to D2, then D3, crucially important for Ca+2 absorption from food, muscle strength, immune function, etc. 54 nmol/L is below optimal. Does D3 concentration determine Ca+2 concentration? No; would not work; is determined by many interacting issues (especially binding/release from bone, uptake within cells under brain control in complex ways not fully understood
Answered 4/23/2015
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