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Actives, Percentages & Layers
Hello!
I have been wondering for a while if applying a cosmetic product on the skin can change the final concentration of the actives depending on how many times you “layer” it.
i.e. A cream has a 5% urea but I apply it twice. Does it mean that the concentration of urea on the skin is closer to 10% than to 5%?
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3 Replies
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No.
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No because when you apply it a second time you are still only applying 5%. You are also applying the 95% of the formula that isn’t your active ingredient. So, the total on your skin remains 5%
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Thank you both very much!
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