"The breakthrough moment came in 1937, when the Temmler-Werke company introduced Pervitin, a methamphetamine-based stimulant. Within months, this [...] was available without a prescription [...] and was widely adopted by all sectors of society to elevate mood, control weight gain, and increase productivity. It’s impossible to untangle Pervitin’s success from Germany’s rapidly changing economic fortunes under the Third Reich."
This explains a hell of a lot about the Nazis.