"The Substance: Albert Hofmann's LSD" is an award-winning 90-minute documentary from 2011, so this one had its 11th anniversary last year. The writer and director is Martin Witz and it is certainly his most known work. This documentary is partially English, partially German, so make sure you got a good set of subtitles perhaps. The German parts are mostly interview with the guy in the title, who is the one that discovered LSD and who also lived over the age of 100. This means this documentary gives information first hand really because there is probably no bigger expert on the subject than Hofmann, even if his discovery may have been a bit on the lucky side. Other references are about the use of LSD as an illegal drug, even if that part is really not in the center of it all, about LSD as a pharmaceutic drug and also about LSD in terms of war/military. The second aspect is probably the central component of the film as there are long sequences about people who took it and who as a consequence participated in medical tests. I would say that the film perhaps became a bit weaker towards the end, but thanks to the first half / first 60 minutes the informative aspect here is really good enough overall to let me say that this film was a success. I am also a bit on the generous side with it here because it is about a subject that does not really interest me at all as I had no prior knowledge, have never taken LSD or plan to. And still it was interesting to watch for the most part. Those with more affection for the topic will probably enjoy the watch a lot. And these are of course also the ones I recommend seeing it to. Everybody else can check it out too, but should keep their expectations not too high.