A study from UC San Francisco shows that one 25 mg dose of psilocybin, the psychedelic in magic mushrooms, alters brain activity, structure, and connectivity. These changes lasted at least one month and linked to improved mood, insight, and cognitive flexibility. Findings suggest potential for…
A single high dose of 25 mg psilocybin produced lasting changes in brain function and structure, according to researchers at UC San Francisco. Participants experienced shifts that improved their mental well-being for weeks. The study appeared in Nature Communications.
Scientists recruited 28 healthy adults with no prior psychedelic experience for a placebo-controlled trial. They gave participants two doses one month apart: a low 1 mg dose as control, followed by 25 mg. Sessions occurred in a dimly lit, aesthetically pleasing setting where people wore eye masks, lay on a bed, listened to music, and received monitoring.
Researchers used EEG to track brain activity during sessions. They performed MRI scans and diffusion tensor imaging DTI to assess brain structure and connectivity before dosing and one month later. Participants also filled out assessments on insight, well-being, and cognitive flexibility at multiple points after each session.
EEG readings revealed higher “brain entropy” during the high-dose experience. The Journal of Neuroscience Methods defines brain entropy as the “measure of the complexity of brain activity that has been linked to various cognitive abilities.” Such increases may help disrupt rigid, unhealthy thinking patterns.
Those with the largest rises in brain entropy reported greater psychological insight the day after dosing. At the four-week mark, they also showed better mental well-being. These outcomes point to sustained benefits from the psychedelic experience.
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DTI scans detected alterations in white matter pathways one month post high dose. These pathways relate to decision-making and emotion. Researchers noted that confirmation in future work would mark the first observation of “anatomical ‘neuroplasticity’” from a psychedelic in humans.
The changes suggest more efficient brain connections. Such neuroplasticity could underlie long-term mental health gains. Learn more about stability in research compounds with the Stability Calculator /tools/peptide-storage-guide .
Robin Carhart-Harris, PhD, a neurology professor at UCSF and senior study author, discussed well-being improvements with Medical News Today. “It will therefore be relevant to people with depression and anxiety who will typically be low in well-being,” said Carhart-Harris. “This study suggests psilocybin therapy can improve general mental health and suggests candidate brain and psychological mechanisms for how this happens.”
Zishan Khan, MD, a board-certified psychiatrist and Regional Medical Director with Mindpath Health, called the work “carefully conducted, but still early-stage.” He praised the multimodal approach but noted the small sample size makes results hypothesis-generating, not definitive. Khan stressed that brain shifts might indicate neuroplasticity, yet need longer-term validation.
Andrew Coop, PhD, professor and associate dean for students at the University of Maryland School of Pharmacy, highlighted ongoing Phase III trials for psilocybin. “Psilocybin has the potential to be a mainstream treatment,” he said. The study bolsters a new federal executive order to speed psychedelic research for mental illness access.
In summary, this research connects a single psilocybin dose to persistent brain alterations and mental health gains. Replication in larger groups will clarify therapeutic potential. Use the Dosage & Cycle Planner /tools/peptide-dosage-planner for precise research planning.
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