Like creams, serums can be easy to use and highly effective, depending on the formula. Some serums use botanical antioxidants to treat under eye bags. The antioxidants help to prevent collagen damage, maintain the skin’s elasticity and brighten skin pigmentation. Others contain hyaluronic acid or retinol. Retinol, while highly useful for fighting wrinkles and producing collagen, can be harsh on the sensitive eye area, so always test it first. No matter which serum you pick, try to choose one in a rollerball tube for an easy application that also helps disperse fluid build-up.