Free Radicals in Sunless tanning lotions, usually contain a compound called dihydroxyacetone (DHA) which is actually a sugar that degrades to free radical products upon exposure to light, according to the University of North Carolina Chemistry Department. Free radicals can biologically damage your body and skin, and accumulate in your body over time. DHA is the compound in sunless tanning products which reacts with the skin to darken it, except in 100% Herbal Instant Tan which does not use DHA or any other synthetic chemicals; only edible ingredients so you now it's safe for the skin.
Allergic Reaction According to the U.S. Food and Drug Administration (FDA), reports of skin rashes have been received from some consumers who use regular sunless tanning lotion products. The FDA states that they are uncertain as to which ingredients or combination of ingredients cause an allergic reaction in some people. Before using a sunless tanning product, it is wise to test a small area of your skin with the product to make sure you do not have an allergy to it.
False Sense of Protection A 2007 article in the "Journal of the American Academy of Dermatology" states that one of the dangers of using sunless tanning lotions is that they promote users to increase their exposure to UV radiation through sun exposure or indoor tanning devices. This journal article goes on to state that the darkened skin color achieved with sunless tanning products may instill a false sense of protection from UV radiation, and users are less apt to practice safe sun behaviors.
No Sun Protection Sunless tanning lotions contain no--or very little--sunscreen, providing inadequate protection against the sun's UV radiation. Wearing only a sunless tanning lotion without an additional sunscreen product can put your skin at risk for a sunburn or excess sun damage.