Dihydroxy (also known as DHA) is a simple carbohydrate that is primarily used as an ingredient in sunless tanning products. It is often derived from plant sources such as sugar beets and sugar cane, by the fermentation of glycerin.

DHA is a triose carbohydrate chemical formula C3H6O3. It is a hygroscopic white crystalline powder. It has a sweet cooling taste and a characteristic odor. It is the simplest of all ketoses and, having no chiral center, is the only one that has no optical activity. The normal form is a dimer which is slowly soluble in one part water and 15 parts ethanol.When freshly prepared, it reverts rapidly to the monomer in solution.