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.
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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