Dihydroxyacetone (DHA) is a simple carbohydrate and a type of sugar. It is commonly used in the cosmetic industry as a key ingredient in self-tanning products. When applied to the skin, DHA reacts with amino acids in the outer layer, resulting in a temporary browning effect that mimics a natural tan. DHA is also used in food products as a sweetener and flavoring agent. It is considered safe for consumption and is often found in low-calorie and sugar-free items. Additionally, DHA is a naturally occurring compound in the body, playing a role in various metabolic processes.