Although some self-tanners contain sunscreen, its effect will not last as long as the tan. The skin browning of a sunless tan may provide some UV protection (up to SPF 3), but this low-level protection should be supplemented with additional protection. The stated SPF for the product is only applicable for a few hours after application of the self-tanner. Despite darkening of the skin, an individual is just as susceptible to harmful UV rays, therefore an overall sun protection is still very necessary. There may also be some inhibition of vitamin D production in DHA-treated skin.