What is Collagen Volumizing Needle, COVA? Fillers inject gel-type substances under the skin to add volume, but COVA naturally fills volume by inducing skin regeneration and collagen production. You'll feel your skin gradually plumping up over time! While fillers can sometimes clump or migrate after injection, COVA is absorbed evenly within the skin, minimizing such concerns. COVA is composed of PDO components that naturally dissolve within the human body. When fillers are used in thin-skinned areas like around the eyes or mouth, there's a risk of them being noticeable or overcorrection, but COVA is more natural and suitable for thin areas. Side effects often reported with fillers, such as vascular occlusion or embolism, do not occur with COVA. It's a safer choice! Compared to Juvelook Volume or other collagen injections, COVA offers significantly greater immediate effects due to its added physical support.