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 ...
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 ...
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