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Question

Dosage of vitamin d needed to achieve 35 to 40 ng/ml (90-100 nmol/l)
historically, 400 iu (10 ug) of vitamin d was recommended for better health because it closely approximated the amount of vitamin d in a teaspoonful of cod liver oil. However, 800 to 1, 000 iu is the dose that may have a better chance of giving a patient a normal vitamin d level. In some countries, vitamin d is listed in micrograms, and the relationship is as follows:
2.5 mcg (micrograms) = 100 iu.
5 mcg = 200 iu.
10 mcg = 400 iu.
15 mcg = 600 iu.
20 mcg = 800 iu.

Prabir Brahmachari · Accepted Answer

Dosage of vitamin d needed to achieve 35 to 40 ng/ml (90-100 nmol/l)
historically, 400 iu (10 ug) of vitamin d was recommended for better health because it closely approximated the amount of vitamin d in a teaspoonful of cod liver oil. However, 800 to 1, 000 iu is the dose that may have a better chance of giving a patient a normal vitamin d level. In some countries, vitamin d is listed in micrograms, and the relationship is as follows:
2.5 mcg (micrograms) = 100 iu.
5 mcg = 200 iu.
10 mcg = 400 iu.
15 mcg = 600 iu.
20 mcg = 800 iu.