Dear M.E.B.: I think many media sources avoid the complexity of the issue. The preferred unit to describe doses of vitamin A are now micrograms RAE, or “retinol activity units.” Different vitamin A ...

If I am taking vitamin A, what is a reasonable dose? I have seen reports that taking too much can cause liver damage, but ...

The Australian regulator admits it may have underestimated the extent of the side effects from vitamin B6 supplements ...

For example, 3,000 IU of vitamin A (as retinol) is 900 mcg RAE. About 18,000 IU beta carotene, which is less potent than ...

Supplements are part of the daily routine for over half of adults in the United States. However, they aren't regulated in ...

Women who might become pregnant should be especially cautious with vitamin A supplements or avoid them entirely .

Newborn babies should be given a vitamin K jab instead of drops to prevent blood clotting problems, national health council Gezondheidsraad has said in new recommendations. A lack of vitamin K can ...

If I am taking vitamin A, what is a reasonable dose? I have seen reports that taking too much can cause liver damage, but nobody says how ...

If I am taking vitamin A, what is a reasonable dose? I have seen reports taking too much can cause liver damage, but nobody says how much is a problem. — M.E.B.

For example, 3,000 IU of vitamin A (as retinol) is 900 mcg RAE. About 18,000 IU beta carotene, which is less potent than ...