Short answer: there is no verified evidence that psilocybin protects pancreatic beta cells in people. A 2024 cell study in a rat beta cell line showed higher cell viability and fewer apoptosis markers under high glucose and fat stress, but it did not clearly restore glucose-stimulated insulin secretion. Findings in a dish do not prove benefit in living organisms.
Human trials that measure beta cell preservation or function after psilocybin are, to my knowledge, not published. Animal data are mixed and often point to indirect mechanisms, such as immune or liver effects, rather than direct beta cell protection. Typical human exposure is brief and likely below the concentrations used in the cell study, which limits translational certainty.
Given this, psilocybin is scientifically interesting but not a proven approach to protect beta cells. Safety, legal status, and potential interactions add further uncertainty. I cannot verify any clinical benefit at this time.
For a compact overview of the current evidence and caveats, see this summary: psilocybin and pancreatic protection.
Bottom line: promising in the lab, unproven in people.