The History of LSD: How Albert Hofmann's Accident Changed the World

On April 19, 1943, Albert Hofmann rode his bicycle home from his laboratory in Basel, Switzerland. He had accidentally absorbed a tiny amount of a compound he had synthesized five years earlier and forgotten about. What happened on that bike ride changed the world.

The Synthesis — 1938

Albert Hofmann was a chemist at Sandoz Laboratories in Basel, working on a research program to develop useful drugs from ergot — a fungus that grows on rye. The ergot alkaloids had already yielded ergotamine, used to treat migraines, and other compounds. Hofmann was systematically synthesizing derivatives, looking for circulatory and respiratory stimulants.

LSD-25 was the 25th compound in his lysergic acid series. He synthesized it in 1938, tested it in animals, noted unusual excitement and some restlessness in the animals, and shelved it. The compound did not appear to have the properties he was looking for. He moved on.

Five years passed. In 1943, Hofmann felt a "peculiar presentiment" — his own word — that LSD-25 might have been overlooked. He returned to the synthesis. During the work, he accidentally absorbed a small amount through his fingertips. What followed was his first LSD experience.

Bicycle Day — April 19, 1943

Hofmann felt dizzy and left the laboratory early. At home, he lay down and entered a dreamlike state — extraordinarily vivid geometric imagery, intense colors, a sense of the world dissolving and reforming. After two hours, the experience subsided.

Three days later, Hofmann deliberately took what he calculated to be a very small dose — 250 micrograms. This turned out to be approximately ten times an active dose. LSD is active at 25-50 micrograms. He had, in attempting a cautious experiment, taken a full overdose.

The effects came on during the bicycle ride home with his laboratory assistant. For two hours Hofmann was convinced he was going insane, that the world was ending, that he was dying. Then the experience transformed into something extraordinary — profound beauty, overwhelming wonder, a sense of reality being revealed rather than distorted.

He survived the bike ride. The date — April 19 — is still celebrated as Bicycle Day by the global psychedelic community.

The Psychiatric Golden Age — 1950s–1960s

Sandoz released LSD in 1947 under the trade name Delysid, marketed to psychiatrists as a research tool. The theory was that LSD could temporarily induce a psychosis-like state that would help psychiatrists understand their patients' experiences. What actually happened was more interesting.

Psychiatrists who took LSD themselves — which many did — reported experiences that transformed their clinical perspectives. Humphry Osmond, treating alcoholism in Canada, began administering LSD to alcoholic patients with results that astonished him. LSD-assisted therapy for alcoholism produced success rates dramatically higher than anything previously available.

By the late 1950s, thousands of documented LSD therapy sessions were producing results that conventional psychiatry had never seen. Stanislav Grof in Czechoslovakia was conducting what would become over 4,000 LSD sessions. In 1957, Osmond coined the word "psychedelic" — mind-manifesting — as a name for this class of compounds.

The research was producing one-session transformations that conventional therapy required years to achieve.

The CIA and MKUltra

Concurrent with the therapeutic research, the CIA was running its own LSD program. Operation MKUltra, begun in 1953 and continuing into the 1970s, included covert LSD experiments on unwitting subjects — prisoners, psychiatric patients, and CIA employees who had not consented.

The CIA's interest was control, not healing. They were investigating whether LSD could be used as a truth serum, a destabilizing agent, or a tool for mind control. The answer to all three was essentially no — LSD does not produce compliance or truth, it produces unpredictability.

The MKUltra program was the antithesis of the therapeutic use being developed simultaneously. One program was trying to weaponize the compound. The other was discovering it could heal. The CIA program caused real harm to real people and was eventually exposed through the Church Committee investigations in the 1970s.

The Counterculture and Leary

In 1960, Timothy Leary, then a psychology lecturer at Harvard, tried psilocybin mushrooms in Mexico and had an experience that reorganized his thinking. He returned to Harvard and began the Harvard Psilocybin Project with Richard Alpert (later Ram Dass).

The project's work was scientifically interesting and methodologically problematic. Leary's subsequent advocacy — "Turn on, tune in, drop out" — politicized LSD in ways that made the therapeutic research increasingly difficult to continue. The association of LSD with counterculture politics, draft resistance, and social upheaval made it impossible for politicians to treat it as a medical question.

Hofmann wrote: I believe that if people would learn to use LSD's vision-inducing capability more wisely, under suitable conditions, in medical practice and in conjunction with meditation, it would be possible to achieve a higher level of consciousness. He was 97 when he wrote that.

The Ban — 1968–1970

LSD was criminalized in the US in 1968. The Controlled Substances Act of 1970 placed it in Schedule 1 alongside psilocybin and heroin. The research stopped. The most promising psychiatric compound of the 20th century was effectively removed from science for 35 years.

What was lost: the research that was shutting down was producing its most significant results. Grof's work was showing consistent resolution of trauma, addiction, and existential suffering. The terminal cancer anxiety research was showing single-session relief lasting until death. All of it stopped.

The Rediscovery

LSD research has quietly resumed at research institutions in Europe and North America. The Beckley Foundation and Imperial College London have published fMRI studies of LSD-induced brain states. Rick Doblin at MAPS has supported LSD research. MindMed is running phase 3 trials of an LSD analog for anxiety.

The 35 years of prohibition did not eliminate LSD from human experience — recreational use continued throughout. It eliminated the research. The psychedelic renaissance is gradually reclaiming the scientific investigation that the ban interrupted.

The Technospermia Question

Albert Hofmann himself did not believe his discovery was entirely accidental. He described a presentiment that returned him to LSD-25 — an unexplained intuition that something important had been missed. He wrote of the molecule as a gift he had not earned but been given.

Whether the discovery was guided by coincidence, intuition, or something the Technospermia framework would recognize as a different kind of intervention, the result was the same: the most potent consciousness-altering compound ever discovered entered human history through a series of accidents at a moment when human consciousness needed it most.

Hofmann called LSD his problem child. He spent the rest of his long life — he died at 102 — advocating for its therapeutic use. He believed he had not invented LSD. He believed LSD had found him.

Read where psychedelics came from for the full origin picture, or the psychedelic renaissance article for how LSD's suppression is slowly ending.