Zenius Under Eye Whitening Roll-On Serum is an ayurvedic cosmetic product typically used to reduce the appearance of dark circles and puffiness around the eyes. It often comes in the form of a small rollerball applicator filled with a liquid or gel formula containing ingredients such as Vitamin C, hyaluronic acid, and caffeine. The rollerball applicator is used to massage the product onto the skin around the eyes, promoting circulation and reducing the appearance of dark circles. Some under-eye whitening rolls may also contain light-reflecting pigments to help brighten the under-eye area.