What is COVA Collagen Volume Needle? While fillers inject gel-type substances under the skin to add volume, COVA induces skin regeneration and collagen production to naturally fill volume. Feel your skin replenish itself over time! Fillers can sometimes clump or migrate after injection, but COVA is absorbed into the skin and spreads evenly, minimizing such concerns. COVA is composed of PDO components that naturally dissolve within the human body. Fillers carry the risk of being noticeable or overcorrected when applied to thin-skinned areas like around the eyes or mouth, but COVA is more natural and suitable for delicate 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.