Erythrulose

Erythrulose is a naturally occurring ketose sugar found in certain plants, such as red algae. In the context of self-tanning, it functions as a tanning agent by undergoing the Maillard reaction with amino acids present in the stratum corneum, the outermost layer of the skin. This reaction produces melanoidins, which are brown pigments that mimic a natural tan. Erythrulose is often used in conjunction with Dihydroxyacetone (DHA), the primary active ingredient in most sunless tanning formulations. While DHA provides an immediate colour development, erythrulose's reaction is slower, contributing to a deeper, more natural-looking tan that develops over a longer period, often 24-48 hours. It can also help to prolong the tan's duration and reduce the streaky appearance sometimes associated with DHA-only products, offering a more nuanced and forgiving application.