A collagen eye serum is a skincare product designed to treat the delicate skin around the eyes by hydrating, firming, and brightening the area. It typically includes ingredients like vegan collagen to improve elasticity and reduce fine lines, peptides to further smooth wrinkles, and hyaluronic acid for deep hydration. It is often formulated to address concerns such as puffiness and dark circles, with some products featuring a cooling applicator for a soothing massage.