What is it?
Hyaluronic acid is a macromolecule present in the extracellular matrix that forms part of different tissues, fundamentally connective tissue. It is one of the three crucial components of the dermis together with collagen and elastin.
Hyaluronic acids of different sizes and molecular weights (MWs) are used in cosmetics. High MW ones generally act on the surface by creating a protective film that reduces transepidermal water loss, while low MW ones act on the epidermis to improve hydration.
What does it do for your skin?
Hyaluronic acid has two main properties: viscoelastic and hygroscopic.
The viscoelastic property means it acts as a stabilising agent on the skin structure by encouraging the reorganisation of the extracellular matrix for a plumping and firming effect.
The hygroscopic property means that, thanks to its ability to retain water, hyaluronic acid has a high moisturising capacity both at depth and on the surface, so regular use makes the skin more hydrated, elastic, firm and supple