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Levels above 50 ng/mL may be too high ... People who are pregnant or breastfeeding also need 15 mcg or 600 IU of vitamin D per day. Doctors use blood tests to determine if someone has adequate ...
1000 IU (25 mcg) per day increases vitamin D blood levels 10 ng/ml (25 nmol/L). 2000 IU (50 mcg) per day increases vitamin D blood levels 20 ng/ml (50 nmol/L). If the vitamin D blood test was 30 ...
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