When you apply SUNLUXE Self-tanning Gel to your body, DHA works by reacting with dead skin cells on the surface of your body. Essentially, your dead skin cells are darkened to mimic a sun-kissed glow. Keep in mind, this darkening of the skin is just that, momentary. This active agent reacts chemically with the free amino acids in the stratum corneum. As a result of this non-UV Maillard reaction, melanoidin pigments gradually form and provide the appearance of a tan. SUNLUXE Self-tanning Gel Special Features: 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.