19/11/2025
"set" and "setting" profoundly influence psychedelic experience.
I propose a third pillar: bodyset. Health biomarkers meaningfully influence how the brain, mind and body receives and processes psychedelics.
Here’s the idea: psychedelics don’t land on a blank canvas. They interact with the autonomic nervous system, inflammatory load, metabolic stability, sleep quality, hormonal environment, and overall physiological resilience of the person taking them. These internal conditions may tilt an experience toward insight and bliss or toward anxiety and dysregulation.
If this is accurate, then biomarkers could help predict the direction, intensity and quality of a trip. Bodyset is an effort to qualify this third pillar.
By measuring 249 biomarkers, the most quantified psychedelic experience ever, my team and I are making a first attempt to map the foundational physiological patterns that may reliably predict an optimal psychedelic experience.
Below is what the field already knows about set and setting, and how bodyset expands the framework.
1/ Set and setting strongly shape psilocybin outcomes
Mental state "set" and environment "setting" have been shown to influence nearly every dimension of the psychedelic experience. In a study analyzing 400+ psilocybin sessions across 261 participants, set and setting shaped three core experiential domains:
+ Oceanic Boundlessness (OBN): m positive feelings, including bliss, unity, transcendence, and spiritual experience.
+ Dread of Ego Dissolution (DED): measures negative feelings associated with "bad trips," such as anxiety and loss of self-control.
+ Visionary Reconstructivization (VRC): Measures hallucinogenic effects, including visual hallucinations and changes in sensory interpretation.
Here are some findings
+ Dose positively correlated with all three dimensions.
+ Setting matters: PET scanner environments increased anxiety and DED, highlighting how sterile or restrictive environments shape negative outcomes. Makes me grateful I have the kernel brain imager to measure my brain in real time while being in an open, positive environment.
+ Openness predicted positive experiences (OBN, VRC)
+ Physical activity before dosing predicted more bliss and vivid imagery
+ Emotional excitability predisposed participants to higher anxiety but also increased insight. Younger age was also linked to more anxiety.
+ Recent psychological problems blunted positive aspects, reducing feelings of bliss, boundlessness, and complex imagery.
2/ Bodyset: the emerging foundation for prediction and optimization
Physical health is emerging as a third determinant of psychedelic response alongside set and setting.
This is supported by evidence linking physical biomarkers to mental states:
+ Cortisol, an index of stress physiology, correlates with well-being
+ BDNF, crucial for neuroplasticity, is altered in many psychological disorders
+ HRV predicts M**A treatment response in depression
+ Autonomic balance before DMT predicts co-activation and the intensity/positivity of the experience
+ Inflammation affects emotional regulation and could plausibly shift a trip’s emotional valence
These early findings suggest physical markers may shape how psychedelics interact with the brain. Influencing depth, clarity, insight, emotional tone, and resilience.
Like a popcorn kernel needing the right conditions to pop, a successful psychedelic experience requires the right set, setting, and bodyset.
Author: Bryan Johnson
