Hyaluronic acid is a natural substance that is often used as a supplement, serum or in other forms. This article lists the top 7 benefits of hyaluronic acid . 5D Multi-Molecular Hyaluronic Acid for Deep, Lasting Hydration This advanced formula features five different sizes of hyaluronic acid molecules—from high to low molecular weight—to help hydrate every layer of your skin. Larger molecules help lock in moisture on the surface, while smaller ones absorb more easily to deliver hydration deep into the skin. Leaves skin feeling plump, smooth, and comfortably dewy without heaviness or stickiness. L'Oreal Paris Revitalift Hyaluronic Acid Eye Serum , 20ml, 1.5% Hyaluronic Acid and 1% Caffeine, Lightweight Texture, Non-Sticky, Reduce Fine Lines Under Eyes 4.0 (547) Get 72Hr intense hydration with new POND'S Hydra Light Serum . Formulated with 2% Hyaluronic acid complex. This deep hydrating serum has micro hyaluronic acid molecules which restore moisture in skin’s deepest layers for an instant plumping action.