(±) -1,2-Propanediol-d8 is the deuterium labeled (±) -1,2-Propanediol. (±) -1,2-Propanediol (1,2- (RS) -Propanediol) is an aliphatic alcohol and frequently used as an excipient in many agent formulations to increase the solubility and stability of agents[1][2].