There have also been allegations of an experimental drug tested upon unwilling inmates in 1944 designated "D-IX" at the Sachsenhausen facility. Designed to increase stamina and endurance, this drug, supposedly consisting of a cocktail of cocaine, methamphetamine (Pervitin), and oxycodone (Eukodal), was designed to see use from members of the Wehrmacht, Kriegsmarine and Luftwaffe to enhance mission performance where longevity and exhaustion become pertinent issues. While these drugs were used in their individual forms by all branches of the German military, the nature and use there of D-IX specifically (especially experimentation upon Sachsenhausen prisoners) lacks enough substantiation to be considered credible, though experiments by the Nazis upon unwilling prisoners utilizing psychoactive compounds is far from myth, and could hardly be ruled outside the realm of plausibility.