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Science

The science behind psilocybin microdosing: neuroplasticity and mental flexibility

Written by

Pleun

At Fungki, we don’t just look at what people experience – we also look at what’s happening underneath. In recent years, there had been a clear shift in scientific research on psychedelics. Where these substances were long associated with stigma and strict regulation, they are nog being re-examined in the context of mental health and brain function.

A recent review article published in Progress in Neuro-Psychopharmacology & Biological Psychiatry (2025) brings these developments together. In this article, we summarize the key insights from this research – without exaggeration, and with a focus on what is actually known.

From stigma to renewed interest

Since the 1970s, research into psychedelics was largely put on hold. That picture has changed significantly over the past decade. Institutions such as the U.S. Food and Drug Administration have granted psilocybin Breakthrough Therapy designation in specific research contexts. This does not mean it is a freely applicable treatment, but it does indicate that early findings show enough potential to justify accelerated further research.

The key shift from the past: psilocybin is increasingly being approached as a therapeutic tool, rather than a recreational substance.

What happens in the brain?

The effects of psilocybin differ fundamentally from traditional medication. While many antidepressants are aimed at stabilizing existing patterns, psilocybin appears to temporarily increase mental flexibility.

  1. Activation of 5-HT2A receptors
    Psilocybin binds to serotonin receptors, particularly the 5-HT2A receptor in the prefrontal cortex. This area plays a key role in how we think, interpret, and respond.
  2. Neuroplasticity
    Research suggests that psilocybin supports processes related to neuroplasticity – the brain’s ability to form new connections. Rather than a “reset,” a more accurate metaphor is: temporary expansion within a system that is usually quite fixed.
  3. Increased connectivity (entropy)
    During the effects of psilocybin, communication between different brain regions increases. Networks that typically operate separately begin to interact more. This may help explain why some people report new perspectives or feel less constrained by habitual patterns of thinking.

How does psilocybin compare to other substances?

In comparative research (including substances such as LSD, MDMA, and ketamine), psilocybin stands out for several reasons:

  • A relatively favorable safety profile in controlled settings
  • A low potential for dependence
  • Effects that, in some studies, appear to last longer than those of substances like ketamine

It is important to note that these findings come from clinical contexts – typically under professional guidance and with carefully controlled dosages.

What does this mean for microdosing?

Most of the current research focuses on higher doses used in therapeutic settings. Microdosing – taking sub-perceptual amounts – has been studied less extensively, but is often placed within the same biological framework: the idea that small stimuli, combined with structure and rhythm, may influence how the brain functions.

At Fungki, we therefore don’t view microdosing as a standalone solution, but as part of a system: the protocol provides structure. The truffles act as the catalyst.

Conclusion

The current “psychedelic renaissance” is not a baseless hype – but it is not a finished story either. What we do know: psilocybin appears to influence processes in the brain related to flexibility, connectivity, and adaptation. What we do not yet fully understand: how these effects translate into long-term, everyday use outside of clinical settings. That is precisely why nuance matters more than certainty.

Read the full study

Would you like to dive deeper into the results of this research? Read the full study here: Askariyan et al 2025 – An overview of psilocybin, LSD, MDMA, and ketamine in revitalizing psychedelic-assisted therapy