Glossary Term
Maillard Reaction (Tanning)
The Maillard reaction is the browning reaction between reducing sugars and amino acids. It is how self-tan works: DHA (dihydroxyacetone) or erythrulose reacts with amino acids in the top layer of the skin to form brown compounds called melanoidins, which give the look of a tan with no UV at all. It is also why DHA bronzers used on a sunbed keep developing colour for hours after a session, and why that colour fades as the top layer of skin naturally sheds.