Fundamental hydration elixir Recommended for Skin Instants that are dehydrated and lacking in lipids. A real shock treatment to boost hydration, Sérum Yall~ contains ultrahigh doses of hyaluronic acid and antioxidant plant extracts. This intense hydrating treatment provides the amount of moisture skin needs to function properly and feel comfortable. The effect is instant, as the fine lines caused by dehydration are plumped up. Hyaluronic acid is an essential molecule naturally found in the skin.