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Can you mix retinol and zinc pyrithione? 

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While lack of response in serum retinol may be explained by generally adequate status, the lack of impact on zinc status requires further exploration.
This may provide a possible explanation for the documented nutritional interactions between zinc and retinol.
Thus, water-miscible, emulsified, and solid preparations of retinol are approximately 10 times as toxic as are oil-based retinol preparations.
We report here that retinol caused cellular DNA damage probably involving cellular iron accumulation.

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