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 ...

In June of 2024, the Endocrine Society, influenced by a substantial body of research conducted in recent years, published new ...

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 ...

Even though vitamin D is critical for overall health, research suggests that an estimated 25% of Americans are deficient ...

A 21-year-old man or women exposed to summer UVB light generates 10,000 IU (the equivalent of 250 mcg, 25 multivitamin pills of vitamin D, or 100 glasses of milk) of vitamin D in 15 to 20 minutes.