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 ...

Several vitamin D supplements are available to help you maintain your health goals in the colder seasons. In this article: ...

She added: "Most of us are low or deficient in Vitamin D, this vitamin supports ... Children aged 1 to 10 years should not have more than 50 micrograms (2,000 IU) a day. Infants under 12 months ...