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.

and for adults >70 years it is 800 IU (20 mcg) daily. While it is advisable to pay attention to Vitamin D intake, it is also recommended to not overdo it. Vitamin D toxicity is as harmful as its ...