Why is retinol banned in Europe?

Online Answer
The FDA, Norwegian, and German health agencies have also raised concerns that applying any form of vitamin A (like retinol) to your skin while pregnant could potentially prove toxic to a developing fetus, but, like many of the ingredients on this list, it's a judgement call.
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Finally, If your skin care routine involves applying several products, apply the retinol cream first, and give it a minute or two to absorb into your skin.
The FDA, Norwegian, and German health agencies have also raised concerns that applying any form of vitamin A (like retinol) to your skin while pregnant could potentially prove toxic to a developing fetus, but, like many of the ingredients on this list, it's a judgement call.