What is the main purpose of sunless tanning products containing DHA?

The main purpose of sunless tanning products containing DHA (Dihydroxyacetone) is to develop a long-lasting tan. DHA is a colorless sugar that interacts with the amino acids in the skin's outer layer, producing a browning effect. This reaction creates a tan that can usually last several days, depending on skin type and care. Unlike immediate bronzers, which only provide a temporary color that washes off, DHA-based products provide a more sustained tan because they gradually develop over several hours after application, allowing for a more natural appearance.

While the other options relate to skin care and tanning, they do not accurately represent the primary function of DHA in tanning products. For instance, while exfoliating can improve the appearance of the tan by removing dead skin cells, it is not the primary action of DHA. Immediate color is typically provided by bronzers that wash off, rather than DHA which requires some time to develop. Lastly, hydration may be a benefit of some tanning products but is not the primary role of DHA in creating a tan.