La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Serum is a serum that contains two types of hyaluronic acid and vitamin B5 to hydrate skin immediately and over time. It also contains anti-inflammatory ingredients like vitamin B5 and thermal spring water, making it safe for acne-prone skin. This serum is lightweight enough to balance hydration on oily complexions, and can target fine lines and wrinkles with regular use. Here are some insights from user and expert reviews: Pros Great for plumping skin and restoring hydration Layers well with moisturizers Leaves skin feeling smooth Easy to use daily Hydrating and soothing