How does UV-free spray tanning work?

A fine mist of DHA (Dihydroxyacelone) is sprayed onto the skin as a self-tanning agent. It does not produce a “real tan” by increasing skin melanin levels, but it can create a tan appearance by way of the development of a brown skin coloring. The action of DHA is limited to the upper layer of the skin and involves a reaction between DHA and skin proteins. The development of color takes anywhere from 2-24 hours and the intensity is dependent on the formulation concentration of the DHA in the product. Most first-time customers are amazed at how natural and attractive the resulting tan is. Spray tans generally last around a week depending on your individual body chemistry and other factors like how often you shower, shave or exfoliate, each of which can remove some of your “tanned” skin cells.

The FDA has approved DHA for external application to the skin. For misting applications, the FDA recommends protective measures to prevent eye contact, inhalation or ingestion. To ensure complete protection, the FDA suggests wearing protective eyewear, nose filters, earplugs, lip balm, and undergarments.