If you’re asking “are self tanners safe,” the key distinction is how the DHA reaches you. A lotion or mousse you spread on your skin is intended for external use. A spray tan can send fine mist toward your eyes, lips, nose and lungs—exposure routes that have not been established as safe. Neither kind of cosmetic tan reliably protects you from ultraviolet (UV) rays.
Are self tanners safe for topical use?
Dihydroxyacetone (DHA) darkens skin by reacting with amino acids in its outer surface cells. The color is temporary and fades as those cells shed. In the United States, the Food and Drug Administration (FDA) permits DHA as a color additive for external application to the body, which is how hand-applied lotions and creams are meant to be used. A mousse applied by hand follows the same basic distinction: keep it on external skin and follow the label.
That does not mean researchers have measured exactly how much DHA, if any, reaches the bloodstream after ordinary use. The FDA says consumers can avoid inhaling or applying retail creams and lotions to the eye area or mucous membranes. It advises keeping DHA off the lips, inside the nose, and in or around the eyes. So use a mitt or your hands as directed, wash your hands afterward, and avoid applying the product to those sensitive areas.
Cell experiments are a reason not to confuse “not fully measured” with “proven harmless at every exposure.” In a 2022 laboratory study published in PLOS ONE, Arlet Hernandez and colleagues exposed HepG3 liver cells to DHA. Millimolar concentrations disrupted cell metabolism and caused cell injury. The study was conducted in cultured cells, not people; it cannot tell us how much DHA enters the body from a self-tan lotion or whether typical topical use causes those effects. It does, however, underline why exposure route and dose matter.
Why spray tans need extra precautions
With an all-over spray, avoiding the face and breathing zone can be difficult. The FDA’s U.S. guidance says DHA should not be inhaled, swallowed, or applied to the lips or mucous membranes, including the nose and the area in and around the eyes. It says the risks of those exposures are unknown, and DHA is not permitted for use in the eye area. The FDA has not approved DHA use as an all-over spray or mist in tanning booths because safety data for that use have not been submitted for review.
If you choose a salon spray tan, ask what they do to protect your eyes and mucous membranes and prevent inhalation. Do not assume closing your eyes alone protects the whole eye area, or that a nose filter protects your mouth. If the salon cannot explain its protective measures, a hand-applied product avoids the airborne mist. For a closer look at what to ask, read our guide to DHA spray-tan safety.
A European Commission Scientific Committee on Consumer Safety estimate cited in a 2022 study put DHA exposure from spray-tanning applications at 0.04–0.61 milligrams (about 0.0000014–0.000021 ounces), depending on the cabin and protective measures. That estimate describes exposure, not demonstrated harm. It also does not establish the amount inhaled or absorbed in every salon session. Research on DHA-treated liver cells cannot fill that gap or be used to predict a customer’s individual risk.
FDA rules apply in the United States; local cosmetic and salon requirements may differ elsewhere. Wherever you are, check the product label and ask a salon directly about protection from mist.
A self-tan is not UV protection
The color from DHA is a surface reaction, not a dependable sunscreen. Most sunless tanners do not contain sunscreen, and the appearance of a tan does not show that your skin is protected from sunburn or other UV damage. Only a product that contains sunscreen ingredients and is labelled with an SPF may provide sun protection. Check its label and use sunscreen separately as directed; do not rely on the tan itself.
If you have a reaction after using a self-tanner, stop using it and seek advice from a clinician, particularly if symptoms are severe or affect your eyes or breathing.