29 Sep '15, 4pm

Do cosmetic ingredients really penetrate skin? Episode 92

It’s important to consider the formula from which the ingredient is being delivered for two reasons. First, if it’s a rinse off product, it’s unlikely to result in very much penetration. That’s because penetration is measured in milligrams per square centimeter per unit of time. That unit of time is frequently hours not minutes and certainly not seconds. Therefore it is extremely unlikely that anything that is rinsed off the skin will have time to penetrate. A leave on product, like a moisturizing lotion, gives the ingredients much more time to penetrate. (Note: an exception could be ingredients which are highly substantive to skin.)

Full article: http://thebeautybrains.com/2015/07/do-cosmetic-ingredient...

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