What do you think the reaction of cosmetics after applying on the skin?

What do you think about the reaction of cosmetics after applying on the skin?
There are two action after applying skincare products and cosmetics.
1.      Absorption
After applying skincare products and cosmetics, some substances will go through the stratum corneum and reach the deeper epidemis, dermis, and subcutaneous tissue.
2.      Adsorption
After applying skincare products and cosmetics, the substances will stay at stratum corneum only.

The cosmeceuticals take effect by percutaneous absorption. The main function of skin is to provide barriers to prevent the stimulations from the environments. It also adjusts the water and heat loss of the body. Such that the cosmeceuticals need to go through the stratum corneum.

Stratum corneum contains flat and dead cells and lipids. The lipids are ceramide, cholesterol, fatty acid, triglceride, and the other grease. 

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