- DHA: At Norvell, we use the best ingredients to provide the best tans starting with DHA. Dihydroxyacetone, DHA is the most commonly used active ingredient in most sunless tanning products and gives an even and natural tan. We work with the #1 supplier of DHA to ensure we have the freshest, best, DHA available. The FDA has approved DHA for sunless tanning and Norvell adheres to the FDA recommended guidelines: use of protective undergarments, nose filters, lip balm, protective eye shields and earplugs, when getting a spray tan.