Dihydroxyacetone (DHA)

The sugar that gives self-tanners their colour by reacting with the dead outer layer of the skin.

Type
Self-tanning agent

Why it is flagged

Barely penetrates living skin; the EU allows it up to 10% in self-tanners. The Canadian Dermatology Association advises keeping spray-tan mist out of the eyes, nose, lips and lungs.

Sources

Also listed as

1,3-dihydroxy-2-propanone, dihydroxyacétone, dihidroxiacetona, diidrossiacetone, dihydroxyaceton