The ultimate performance enhancing drug the Germans prototyped was D-IX which was not mentioned in the article. Each tablet contained 5 mg of oxycodone, 5 mg of cocaine and 3 mg of methamphetamine, so it was potent stuff.<p>> German researchers found that equipment-laden test subjects (inmates from Sachsenhausen concentration camp) could march in a circle for up to 90 kilometers per day without rest while carrying a 20 kilogram backpack.<p><a href="https://en.wikipedia.org/wiki/D-IX" rel="nofollow">https://en.wikipedia.org/wiki/D-IX</a>