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.

Medically reviewed by Suzanne Fisher, RD Foods with vitamin D include dairy products, fatty fish, eggs, and mushrooms. While ...

Unfortunately, it’s not unusual to have low levels of the vitamin. While there isn’t a consensus on the ideal amount of ...

Breastfed infants and children with certain medical conditions are also susceptible to vitamin D deficiency. If a healthcare professional has recommended a vitamin D supplement for calcium ...

Women who have regular sunlight exposure do not need any extra vitamin D. However, in the absence of adequate exposure to sunlight, 5 mcg/day or 200 IU in the form of cholecalciferol is recommended.