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Azeite
New Member
Joined: 21 Apr 2012
Posts: 8
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Sat Apr 21, 2012 7:16 am |
Hi - this is my first post here - I'm just trying to understand how moisturizers work.
As best I can tell, moisturizers have 2 most important parts: a humectant and a barrier (occlusive). Usually the humectant is glycerin and the barrier is petrolatum or mineral oil.
(yes, I realize there are more ingrediants like emolliants, but these seem to be the big 2)
If I understand correctly, most of the time humectants draw moisture to the epidermis from the dermal layers underneath, rarely from the external atmosphere, correct? (unless if it happens to be a very humid environment)
And the point of having a barrier-occlusive on top of the humectant is to keep the moisture from escaping (correct, so far?)
My main question: So if we have a barrier on top of the humectant - then there's no way that the humectant could get moisture from the outside atmosphere anyway, right? (because there's a barrier on top of it)
But here's a complex second question: in a perfect world, the barrier would be layered on top of the humectant. But that's not what's really happening - the two substances are mixed together in the moisturizer cream. So doesn't this mean that the occlusive could be preventing the humectant from attracting moisture from both above and below because both substances are blended together? |
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Thu Mar 28, 2024 2:59 pm |
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