I think the recommended daily allowance of vitamin A taken internally is 1.5mg. But when I use products like Retin - A, which is in cream form applied topically, should I take that into consideration too in making sure that I dont exceed my daily allowance of vitamin A? Doesn't that also get absorbed by my body?
Does Applying Products Containing Tretinion Topically Count Towards RDA of Vitamin A?
Doctor Answers 2
Tretinoin and vitamin A
Interesting question. Tretinoin and vitamin A are related compounds, but not identical. A certain (small) percentage of Vitamin A is converted to tretinoin by the body. Applying tretinoin topically, however, should have no bearing on vitamin A supplementation.
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Applying Retin A does not go towards the recommended daily allowance for vitamin A
Taking oral retinoids and vitamin A together, on the other hand, may result in symptoms of excess vitamin A (hypervitaminosis A). So when taking oral retinoids, check your vitamins to make sure you are not taking extra vitamin A.
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