Hyaluronic Acid, 1 oz glass bottle Handcrafted using both high and very low molecular weight hyaluronic acid, in order to reach different layers of the skin. The very low molecular one is less viscous then the high molecular one, but more effective for the deeper layers of the skin. The key benefit of hyaluronic acid is hydration and the great ability to retain moisture. Hyaluronic acid attracts and binds to water molecules and increases the water content of the skin. Try applying a hyaluronic serum straight out of the shower or after washing your face, on damp skin. Then, make sure to follow up with a moisturizer packed with emollients, to keep the hydration 'locked in'.