Hyaluronic acid is used, in cosmetic formulas for instance, by employing molecules with different molecular weights: in other words, they are of different sizes, each one with a different, specific function.
The larger molecules settle on the surface, providing hydration and creating a film that retains water on the skin, while small molecules, on the other hand, reach the epidermis. And the very small ones sink down to the dermo-epidermal junction, thus providing constant hydration and stimulating the synthesis of collagen and elastin. The fourth cross-linked molecular weight is made up of molecules that are linked together to form, as per its name, a cross-linked structure that instantly multiplies the skin's water reserves up to 50 times, thus counteracting the natural slowdown of cellular metabolism and plumping the skin from the inside.
Face D products that use the four different weights of hyaluronic acid, and which therefore have very high hydrating properties, are Pure Plump HA4 Hyaluronic Acid, Hydrating Firming Body Cream, and our range of Cleanser Micellar Water.