Deep Hydration (Hyaluronic Acid) Serum

Four molecular weights of hyaluronic acid in one serum — crosspolymer, sodium hyaluronate, acetylated, and hydrolysed. One fluid ounce, fragrance free.

The point of using four rather than one is molecule size: larger forms sit at the surface, smaller ones travel further in. Most serums use a single weight.

Apply to clean, slightly damp skin before moisturiser — hyaluronic acid works by holding water, so it needs some to hold. Selected by our physicians.