To plump up the skin and restore a healthy and hydrated feeling, the concentrated serum Kiehl's Ultra Pure High-Potency Serum 1.5% Hyaluronic Acid helps. Thanks to its minimalist formula, it is quickly absorbed and the active ingredients, including hyaluronic acid, immediately penetrate the skin and start working. The necessary moisture is retained in the skin, the skin is hydrated and plumped, which is noticeable after just one week of regular daily application.