Vitamin D

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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