In this episode of All-In, Bryan Johnson discusses his exploration of psychedelics as potential tools for longevity and cognitive enhancement. He shares his experiences with substances like 5-MeO-DMT and psilocybin, describing the neurological and physiological changes he observed through scientific monitoring, including alterations in brain connectivity, metabolism, and gut microbiome composition.
The conversation also examines the significant risks associated with psychedelic use. Johnson and David Friedberg address the importance of proper supervision and mental preparation, while exploring how these substances can lead to dramatic shifts in personal priorities. They note that these changes can be so impactful that some investors include contractual clauses restricting psychedelic use by company executives.

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Bryan Johnson shares his transformative experiences with psychedelics, particularly focusing on 5-MeO-DMT and psilocybin. During his 5-MeO-DMT experience, which he describes as the most powerful psychedelic in existence, Johnson experienced complete ego dissolution, leading to a profound state of unity with existence. After the session, he reported feeling psychologically younger by decades, with persistent positive changes in his mood and relationships.
With psilocybin, Johnson observed significant neurological and physiological changes. Using a brain interface called kernel, he noted how psilocybin dampened his default mode network while promoting new neural connections. The substance also affected his metabolism and gut microbiome composition.
Johnson's interest in psychedelics for longevity was sparked by preclinical evidence showing anti-aging benefits in mice. Through what he calls "the world's most studied, quantified experiment with psilocybin," Johnson has come to believe that psychedelics might be more effective at rejuvenating the body than traditional methods like diet and exercise.
Johnson and David Friedberg discuss the significant risks associated with psychedelic use. Johnson emphasizes the importance of proper supervision, setting, and mental preparation, noting that psychedelics can trigger permanent psychological changes or psychosis in some individuals. Friedberg raises concerns about how psychedelic use can dramatically alter personal priorities, citing examples of tech executives making life-changing decisions after psychedelic experiences. This concern is so significant that Johnson mentions one investor included a clause prohibiting his psychedelic use during the company's lifespan.
1-Page Summary
Johnson shares a profound, transformative experience with 5-MeO-DMT and the significant brain and body effects, including a metabolic reset and gut microbiome changes, from Psilocybin.
Bryan Johnson's recent foray into 5-MeO-DMT, which he declares the most powerful psychedelic in existence, led to a transformative experience that eclipses all other significant life events he’s undergone.
Johnson explains that upon taking 5-MeO-DMT, one's consciousness expands vastly beyond normal experience, without the visual hallucinations associated with DMT, such as "elves." During his encounter with 5-MeO-DMT, Johnson felt his ego and individuality dissolve, leading to a need to release all attachments, desires, and control to prevent panic and fear. When he surrendered, he experienced an indescribable state of bliss and oneness, where the default mode network—which constructs the self and ego—was completely dissolved.
After the psychedelic session, Johnson describes feeling rejuvenated by 30-40 years psychologically, akin to returning to a childlike state of wonder and openness. He notes that these changes in mood, behavior, and relationships have persisted for days following the experience.
Unlike 5-MeO-DMT which obliterated his sense of self, psilocybin ‘dampens’ Johnson’s default mode network, fostering neuroplasticity and maintaining a youthful ...
Johnson's Psychedelic Experiences and Their Effects
Bryan Johnson's interest in psychedelics for longevity stems from his exploration of scientific evidence on health and longevity. He has embarked on a psychedelic journey, viewing these substances as potential tools for rejuvenating the brain and body.
Initially, psychedelics weren't on Johnson's list for anti-aging solutions. Traditionally viewed as ancient medicine for mental health issues or used in rituals, his curiosity was piqued by preclinical evidence suggesting an anti-aging benefit in mice using psilocybin. He expressed enthusiasm about the potential of psychedelics, stating, "Honestly, I am so encouraged by psychedelics."
Continuing with his investigations, Johnson now believes psychedelics may have a superior effect on rejuvenating the body compared to more conventional longevity methods such as diet, exercise, and supplements. His personal experiences with 5-MeO-DMT lead him to feel that this psychedelic compound offers a more profound "reset" for himself as a human being, beyond the benefits realized from a healthy diet, regular exercise, adequate sleep, or even sauna and hyperbaric oxygen therapy sessions.
Through what he describes as "the ...
The Use of Psychedelics as Longevity Therapies
Bryan Johnson and David Friedberg address the potential for both dramatic personal transformation and considerable risks associated with the use of psychedelics.
Johnson discusses the profound changes that psychedelic use can have on a person's brain, equating it to a reconfiguration of more than 60 trillion cells. This can be one of the most dramatic reconstructions that a person can experience. Johnson emphasizes the need for careful consideration before using psychedelics, highlighting the necessity for it to be done with a licensed professional and in the right state, as they are extremely powerful.
David Friedberg brings up the philosophical question of personal identity in the context of psychedelics—whether one remains the same person after such significant rewiring. There are concerns that psychedelics can induce permanent psychoses and trigger schizophrenic states, especially in those potentially predisposed to such conditions.
Johnson is aware of the possibility of bad trips that can leave people scarred and underscores the importance of approaching psychedelics with caution and rigor. He notes the dangers of consuming psychedelics like magic mushrooms without knowing the strain, dose, or the right environment—pointing out the need for quantification, supervision, and a proper setting to reduce risks.
Despite these risks, Johnson mentions that one investor was so concerned about his psychedelic use that a clause was included in the investment deal documentation to prohibit him from ...
The Risks and Downsides of Psychedelic Use
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