In some countries, vitamin D is listed in micrograms, and the relationship is as follows: 2.5 mcg (micrograms) = 100 IU. 5 mcg = 200 IU. 10 mcg = 400 IU. 15 mcg = 600 IU. 20 mcg = 800 IU.

Generally adequate vitamin D levels in the blood are 20 ng/ml or above for adults. People aged 1 to 70 years should aim to get at least 15 mcg or 600 IU of vitamin D per day. Those who are older ...

Discover the essential daily intake of vitamin D to promote bone health, boost immunity, and improve overall well-being.

Vitamin D3, a form of vitamin D, promotes strong bones, good immune health, and mental well-being. You can get vitamin D3 from fortified foods, eggs, and fatty fish — or by spending time in the sun.

There are two types of vitamin D supplements available for over-the-counter purchase (vitamin D2 and vitamin D3). Vitamin D3 is the type that most experts believe should be utilized in clinical ...