I am very concerned about getting too much vitamin A. Is there danger in getting too much vitamin A if I take fish oil, which I've heard contains a lot of vitamin A, in addition to my multivitamin?
Most traditional fish oil supplements
(from the oil in fish meat) do not contain significant amounts of vitamin A and should not be of concern when taken with a multivitamin
On the other hand, fish liver oils such as cod liver oil do contain significant amounts of vitamin A. Some of these products exceed the established upper limit for vitamin A for adults of 10,000 IU per day, or could exceed this limit if taken with multivitamins that contain high amounts of vitamin A. (See amounts of vitamin A found in popular cod and other fish liver oils in the Vitamin A Supplements Review
When calculating the amount of vitamin A you are getting from supplements, note that the upper limit only includes the retinol form, such as retinyl acetate or retinyl palmitate, not beta-carotene. (There are, however, separate concerns with getting too much beta-carotene
Also, keep in mind that Americans are more likely to get too much vitamin A from their diets, rather than too little. Unless you are deficient or have a condition which causes deficiency, you may not need to get any vitamin A from supplements. For more about the risks of getting too much vitamin A, see the Vitamin A Supplements Review >>
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This CL Answer initially posted on 8/19/2015.
Last updated 8/2/2017.