MenExpert EyeRegener Roller Serum is a formula that works to reduce the appearance of dark circles, swelling, and puffiness around the eye area. It contains a high concentration of caffeine in addition to kojic acid, which works synergistically to address visible skin problems. What makes the MenExpert EyeRegener Roller Serum so special? OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.