During my last vacation, I watched an insane documentary about the Nazis' extensive amphetamine use and Adolf Hitler's drug addiction.

The film made an incredible claim: that Hitler killed himself because his doctor cut off his amphetamine supply.

This theory sounded crazy — I had to look into it — but when I got back to work, I couldn't find the documentary.

I wondered whether I had entered some type of twilight zone (cruise ships have pretty strange channels). But my parents saw it too — we couldn't have all imagined the same thing.

At first glance, I thought it was the 2014 BBC documentary "Hitler's Hidden Drug Habit: Secret History." But I watched the whole thing, and the filmmakers made no mention of this wild can't-get-drugs suicide theory.

Dr. Theodor Morell. Public domain To be clear, though: Yes, Hitler was very, very into drugs.

Various scholars have outlined his extensive substance use. His personal physician, Dr. Theodor Morell, pumped him full of all sorts of treatments, from nerve tonics to Pervitin, a type of amphetamine common in Germany at the time.

Morell's personal journals list 74 medications that he gave the führer, according to the BBC documentary, sometimes administering up to 20 injections a day. The floor of Hitler's bunker where he spent his last days was also said to be littered with medications when researchers entered it years later.

There was apparently a rift between Hitler and his doctor in the days before his death. Morell fled the country, and then on April 30, 1945, Hitler killed himself.

But would a lack of access to Morell's cache of drugs explain why Hitler did it?

There are simpler explanations for Hitler taking his own life — the fact that he was rapidly losing the war, for one.

I tried to find other people who had seen the same documentary I had and came across just one person on Twitter:

But "America's Greatest Monuments" didn't pan out. I ultimately contacted a few researchers who were involved in the BBC documentary to see whether they had heard of the suicide theory.

Sarah Bailey, a pharmacologist at the University of Bath, expressed strong doubts to Tech Insider:

"It is clear from the documents of the time that Hitler's medicines were numerous and wide ranging. However, it is not clear how much or how frequently these medicines were given. As a pharmacologist, we have to be careful that the dose of any medicine determines whether it may have a medicinal effect rather than a toxic effect.

"It is documented that Hitler took amphetamine (not methamphetamine which is chemically slightly different, more addictive and faster acting). However this did not appear to be routinely in use and we do not know how frequently or how much he was given. Many other medicines appeared to have been given more routinely.

"From the information we had in preparation for making this film, it is too limited to make any conclusions. My personal feeling is that Hitler was not a meth addict but was an experimental subject for many of Dr Morrell's ideas about medicines."

The clearest condemnation of this crazy theory came from Sir Richard J. Evans, a historian who has extensively studied World War II and the Third Reich.

Evans directed me toward an essay he wrote in a recent book of his titled, "Was Hitler Ill?" In it, he outlines how considering whether Hitler was insane or sick is a futile endeavor:

"Hitler was not insane or deranged, or suffering from drug-induced delusions," he writes, "or laboring under the effects of some chronic disease such as syphilis, or acting in an unresolved hypnotic trance: on the contrary, he was sane according to any reasonable definition of the term, and fully responsible for his actions."

In response to the idea that Hitler killed himself because his amphetamine injections were cut off, Evans was unwavering: "I'm afraid this is complete rubbish," he told Tech Insider in an email.

But the most convincing argument came from Roland Jones, a colleague of Bailey's at University of Bath. Jones said he agreed with Bailey's assessment and added that if Hitler wanted to get amphetamine, "he could easily have obtained it elsewhere."

After all, he was Hitler.

So while we'll label this theory debunked for now, questions about that enigmatic documentary remain. Why would someone make a documentary about it? And where did the filmmakers' evidence come from?

If you have any credible information about who made it, or have seen the documentary, too, email us at science@techninsider.io.