800 IU (20 mcg) per day increases vitamin D blood levels 8 ng/ml (20 nmol/L). 1000 IU (25 mcg) per day increases vitamin D blood levels 10 ng/ml (25 nmol/L). 2000 IU (50 mcg) per day increases ...

He had recommended: "I take 25 mcg (1,000 IU), which is within the limits of what's considered safe (anything under 100 mcg a day for adults or 50 mcg for children, according to the NHS ...

The NIH notes that symptoms of vitamin D toxicity are most likely to appear when a person’s daily intake is at least 10,000 IU (250 mcg). However, experts have cautioned that much smaller ...

This amount depends on your age. According to the National Institutes of Health (NIH), amounts start at 25 mcg (1,000 IU) for newborns and go up to 100 mcg (4,000 IU) for adults. It’s important ...