Because hyaluronic acid is a natural humectant capable of holding 1,000 times its own weight in water, this ingredient should be applied first before your moisturizer. Topically, hyaluronic acid serums are much more potent and can penetrate into the skin deeper. If you are looking for a product recommendation, we recommend SkinCeuticals H.A. Intensifier. This product is a multi-functional corrective serum that reduces the look of crow’s feet, nasolabial folds (parenthesis around the mouth or laugh lines) and marionette lines (lines from the corners of the mouth down to chin) for smoother, firmer skin. Clinical studies demonstrate that this product significantly improved the appearance of plumpness and firmness. This can be used on the entire face, under eyes, and on lips