Hyaluronic acid is the molecule the skin uses to hold on to water: a single molecule can bind many times its own weight in water, which translates into a complexion that looks fuller, smoother and plumper. In Chrissie formulas you will find it at different molecular weights, so that it works both on the surface and in the outermost layers of the skin.

In this selection you will find serums, creams, eye contour and body treatments that help hydrate and restore density to the skin's appearance. It is the right active if your skin feels tight, if you notice dehydration lines or if your complexion looks dull and lacking in firmness — even on oily skin, which can be dehydrated while still producing sebum.

You can pair it with practically any other active. Apply it on still slightly damp skin and seal it in with a face cream. To learn more, read our guide to hyaluronic acid, or discover the treatments for dehydrated skin.