There are two main forms, vitamin D3 and vitamin D2. Vitamin D3, also known as cholecalciferol, is a form of vitamin D that is synthesized in the skin upon exposure to sunlight, says Hodson.

There are two main forms, vitamin D3 and vitamin D2. Vitamin D3, also known as cholecalciferol ... allowance for vitamin D is between 400–600 IU for healthy children and adults.

Currently, the National Institutes of Health (NIH) Office of Dietary Supplements recommends that people ages 1 to 70 consume 15 mcg (600 IU) of vitamin D daily and that people over 71 increase ...

Currently, the National Institutes of Health (NIH) Office of Dietary Supplements recommends that people ages 1 to 70 consume 15 mcg (600 IU) of vitamin D daily and that people over 71 increase ...

Currently, the National Institutes of Health (NIH) Office of Dietary Supplements recommends that people ages 1 to 70 consume 15 mcg (600 IU) of vitamin D daily and that people over 71 increase ...

As per a Harvard report, the Recommended Dietary Allowance for adults 19 years and older is 600 IU (15 mcg) daily for men and women, and for adults >70 years it is 800 IU (20 mcg) daily.

Yet, many people do not get enough vitamin D from sun exposure alone. There are several reasons for this: Dietary supplements may contain vitamin D2 or D3 ... (4,000 IU) for adults, according ...

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.

Infants, 0 to 12 months: 400 IU (10 mcg) a day Children and adults, 1 to 70 years old: 600 IU (15 mcg ... sources like mushrooms and yeast. Vitamin D3 (cholecalciferol) is found in animal ...