Mccosmetics Prof. Hyaluronic Acid, 5 x 5mlHyaluronic Acid Hyaluronic Acid is especially suitable for very dry and dehydrated skin and for the treatment of wrinkles and expression lines. The active principle of hyaluronic acid, due to its effect on the maintenance of water molecules in the tissue, restores skin hydration, prevents the loss of transepidermal water and contributes to the filling of wrinkles by restoring collagen levels.