Pervitin was a methamphetamine that became a key part of Nazi military strategy. Even though it primary looked like a medicine, and it was available in every pharmacy with a prescription, the Germans will struggle with addiction and consequences caused by Pervitin for years. The popularity of the "courage pill" among the German soldiers was so huge, that almost 35 million of these pills were dispensed from April to July in 1940.
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https://www.youtube.com/watch?v=lxhhVu4IOxg