The Germans were not ashamed of using performance-enhancing drugs on the front lines of World War II. After all, anything that gives your side an edge really matters when the stakes are life and death. Nazi soldiers used Pervitin, a kind of methamphetamine, to stay awake, alert, and march that extra mile during the blitzkrieg conquest of Western Europe. It was so effective that the allies even started experimenting with similar drugs, but none was really perfect for the Allied cause, so the matter was dropped.
Not so in the Soviet Union.
The USSR had some problems unique to their theater of war.
(Museum of the Great Patriotic War)
Aside from the brutality of the fighting between the Nazis and the Communists, two competing ideologies who downright hated each other, the Eastern Front was one of the deadliest of World War II because of one terrifying factor: the weather. Neither side was properly equipped to fight in the long, harsh Russian winter. Hitler didn't trust meteorologists and instead listened to occultists when deciding how to outfit his Eastern armies. The first winter of the Soviet War began in earnest in September 1941 and would get so cold that German troops' eyelids were lost to the cold. Some temperatures were recorded at -45° Fahrenheit near Leningrad (modern-day St. Petersburg).
The Red Army had its own problems with the cold and its own problems in dealing with the cold. Its solution was to use a drug of its own, which they called "heat pills," but the rest of the world knows it as 2,4-Dinitrophenol – a potent high explosive, herbicide, and weight-loss drug.
In Soviet Union, drug eats YOU.
When your choices are to take a potentially dangerous weight-loss drug that makes you feel warm when you're definitely not warm and risk a heart attack or maybe feel every moment of freezing to death while a hundred Nazis try to murder you, the choice becomes very clear when you're the average Red Army Ivan trying not to be one of the 26 million or so dead Soviets by the end of the war. For the USSR chain of command however, they quickly realized they had a problem.
Weight-loss drugs sped up the metabolism of their already too-hungry front line soldiers. It also actually fatigued them further by burning fat for heat instead of energy. Also, it killed a lot of Russian troops, either through heart attacks or fever. But what was the Soviet high command supposed to do? Properly clothe them? That's not how the Red Army works, comrade.