Vitamin D is crucial in strengthening bones, boosting the immune system, and regulating mood. While our bodies have the ability to produce vitamin D when exposed to sunlight, there are individuals ...

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 ...