Dehydroascorbic acid (DHA) is an oxidized form of
ascorbic acid (vitamin C). It is actively imported into the
endoplasmic reticulum of cells via glucose transporters. It is trapped therein by reduction back to ascorbate by glutathione and other thiols. The
(free) chemical radical semidehydroascorbic acid (SDA) also belongs to the group of oxidized ascorbic acids.