Under-eye filler falls in the category of injectable filler or also known as dermal fillers. The filler serves as a volumizer to the under-eye area. The most common and popular filler ingredient used for the under eye is the hyaluronic acid. However, other known fillers that can serve the same purpose like collagen, lactic acid, and calcium, but hyaluronic is commonly used because it is the thinnest ingredient that can complement the thin skin of the under eyes. The most common brands of hyaluronic acid fillers used are Juvederm, Restylane, and Belotero which is the thinnest HA filler and the most ideal for the eye area.