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Definition: Hyaluronic Acid! It’s one of the main contents of the dermis’ glycosaminoglycans, which retain water. Remember that HA starts to decline from the age of 25! The epidermis loses the principal molecule responsible for binding and retaining water molecules, resulting in loss of skin moisture. Hyaluronic acid has a high molecular weight and is very hydrophilic, this means that it’s attracted to water. It functions as a ‘molecular sponge’ allowing extensive hydration. It also functions as a transdermal delivery system for other activities (like Uber). It is a “giving humectant” meaning that it attracts water, but also forms a film.
A 70 kg adult has about 15 g of HA in her body, and half of it is in the skin.
Claudia Tua Clark