Neutrogena Hydro Boost Hyaluronic Acid Serum 30 ml is a high to low-weight hyaluronic acid face serum that helps retain skin moisture and protect it from drying out. Is formulated using our 17% Hydration Complex & Glycerin, recommended by dermatologist for all skin types especially sensitive skin.This formula penetrates nine layers deep into the skin. Helps nourish the skin because it contains vitamin B5 and water magnets that lock in. it's the best whitening serum ever.