25(OH) Half-life 15 days in circulation, 8 weeks in adipose tissue
Tmax 5 days
Absorption half-life 1.3 days
NOAEL 100 ng/ml OR 10,000 IU for 50 kg b.w. person
Sun exposure for 30 minutes is equivalent to 10,000 IU
100 IU = 1 ng/ml for 50 kg b.w.
Body mass * 2 = IU per ng/ml
1 mcg = 40 IU
100 IU per minute of sun exposure for Vitamin D3
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