This topic attracts two kinds of writing: breathless evangelism and joyless debunking. Both are lazy. LSD was synthesized—so yes, invented—but its psychoactive effects were discovered later, which is why both verbs survive. Albert Hofmann first made LSD-25 at Sandoz in 1938 and recognized its extraordinary effects in 1943. Then came the bicycle, and history acquired a mascot.
The version worth rescuing
Hofmann synthesized LSD while studying ergot derivatives; the compound did not initially look especially useful. If the answer depends heavily on dose, person, place or preparation, then the context is not a footnote. It is part of the phenomenon.
What the poster on the wall is really saying
In 1943 he unintentionally absorbed a small amount and experienced unusual effects, prompting a deliberate self-experiment days later. That does not make the observation trivial. It makes the claim testable, which is a considerable improvement over incense and certainty.
How the story became bigger than the fact
The famous bicycle ride occurred during that early deliberate experiment and became counterculture mythology long after the laboratory event. This matters because psychedelic culture has a long and occasionally magnificent tradition of turning “possibly” into “obviously.”
How counterculture turned it into an icon
The more interesting history includes psychiatry, intelligence agencies, prohibition, art and the transformation of a Swiss pharmaceutical compound into a global symbol. There are real questions here. They become easier to see once the promotional fog and psychedelic folklore are moved out of the way.
The evidence is uneven, the culture is noisy and the human experiences can be enormous. A decent article should be capable of holding all three facts at once.
Where that leaves us
There is enough here to justify attention and not enough to justify evangelism. That middle ground is less marketable, admittedly, but it is also where most serious understanding begins.
The adjacent question lives in What Does LSD Feel Like? A Description Without Pretending Every Brain Is the Same.
The studio detour
The essay ends in words; the same theme keeps going in the studio. Browse LSD-inspired art & apparel, the psychedelic T-shirts collection, or see Albert Hofmann Bicycle Day T-shirt.