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A systematic study of microdosing psychedelics
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Abstract
The phenomenon of 'microdosing', that is, regular ingestion of very small quantities of psychedelic substances, has seen a rapid explosion of popularity in recent years. Individuals who microdose report minimal acute effects from these substances yet claim a range of long-term general health and wellbeing benefits. There have been no published empirical studies of microdosing and the current legal and bureaucratic climate makes direct empirical investigation of the effects of psychedelics difficult. In Study One we conducted a systematic, observational investigation of individuals who microdose. We tracked the experiences of 98 microdosing participants, who provided daily ratings of psychological functioning over a six week period. 63 of these additionally completed a battery of psychometric measures tapping mood, attention, wellbeing, mystical experiences, personality, creativity, and sense of agency, at baseline and at completion of the study. Analyses of daily ratings revealed a general increase in reported psychological functioning across all measures on dosing days but limited evidence of residual effects on following days. Analyses of pre and post study measures revealed reductions in reported levels of depression and stress; lower levels of distractibility; increased absorption; and increased neuroticism. To better understand these findings, in Study Two we investigated pre-existing beliefs and expectations about the effects of microdosing in a sample of 263 naïve and experienced microdosers, so as to gauge expectancy bias. All participants believed that microdosing would have large and wide-ranging benefits in contrast to the limited outcomes reported by actual microdosers. Notably, the effects believed most likely to change were unrelated to the observed pattern of reported outcomes. The current results suggest that dose controlled empirical research on the impacts of microdosing on mental health and attentional capabilities are needed.
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“therapeutic benefit of low doses of psychedelics remains to be demonstrated in a well-controlled clinical study”
From Psychedelics and Other Psychoplastogens for Treating Mental Illness. (2021) · cites this paper as [249]
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“the data on human psychedelic microdosing are equivocal”
From Psychedelics and Other Psychoplastogens for Treating Mental Illness. (2021) · cites this paper as [249]
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“but other studies did not find this effect in a general population sample (12) and a general sample without individuals diagnosed with a mood, anxiety, substance use, psychotic or dissociative disorder (13).”
From Trait mindfulness and personality characteristics in a microdosing ADHD sample: a naturalistic prospective survey study (2023) · cites this paper as [13]
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“Though one prospective (survey) study investigating adults (excluding individuals with mood, anxiety, substance use, psychotic or dissociative disorders) did not find a change in mindfulness scores after MD (13)”
From Trait mindfulness and personality characteristics in a microdosing ADHD sample: a naturalistic prospective survey study (2023) · cites this paper as [13]
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“though other studies investigating healthy individuals did not find this effect (13, 29).”
From Trait mindfulness and personality characteristics in a microdosing ADHD sample: a naturalistic prospective survey study (2023) · cites this paper as [13]
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“but was increased in a sample consisting of adults without mood, anxiety, substance use, and psychotic or dissociative disorders (13).”
From Trait mindfulness and personality characteristics in a microdosing ADHD sample: a naturalistic prospective survey study (2023) · cites this paper as [13]
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“The discrepancy between the findings by Polito and Stevenson (13) and the current study could potentially be explained by different sample characteristics as they excluded individuals with certain mental disorders, such as mood and anxiety disorders.”
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“The finding that mindfulness was enhanced in MD individuals is in line with previous studies reporting this association (6, 11), but in contrast to one previous prospective MD study that did not find any changes in mindfulness after 6 weeks of MD (13).”
From Trait mindfulness and personality characteristics in a microdosing ADHD sample: a naturalistic prospective survey study (2023) · cites this paper as [13]
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“Interestingly, these variables were not those that participants most expected to change, suggesting that long-term changes may be due to biological changes and not only expectations (Polito and Stevenson, 2019).”
BackgroundSelf-blinding citizen science to explore psychedelic microdosing
Szigeti, B., Kartner, L., Blemings, A., Rosas, F., Feilding, A., Nutt, D. J., Carhart-Harris, R. L., & Erritzoe, D. (2021) · eLife · doi:10.7554/elife.62878 · Cited by 192
Metadata
- Authors
- Polito, V., & Stevenson, R. J.
- Affiliations
- Macquarie University (AU)
- Corresponding author
- Polito, Vince
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2019-02-06
- Volume
- 14
- Issue
- 2
- Pages
- e0211023
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC6364961
- OpenAlex
- W2895986834
- Cited by
- 235
- References
- 87
- Citations by year
- 2026: 19 · 2025: 31 · 2024: 36 · 2023: 30 · 2022: 32 · 2021: 39 · 2020: 29 · 2019: 18
- FWCI
- 34.45
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Topics
- Social Sciences › Psychology › Clinical Psychology › Psychedelics and Drug Studies
- Social Sciences › Psychology › Social Psychology › Paranormal Experiences and Beliefs
- Social Sciences › Psychology › Social Psychology › Psychological Well-being and Life Satisfaction
- Keywords
- microdosing, psychedelics, psychological functioning, mood, depression, stress, attention, distractibility, absorption, neuroticism, creativity, mystical experience, sense of agency, expectancy bias, mental health, well-being
- MeSH terms
- Patient Reported Outcome Measures, Adult, Attention, Culture, Dose-Response Relationship, Drug, Female, Hallucinogens, Humans, Male, Mental Health, Middle Aged, Personality, Psychometrics, Empirical Research, Young Adult
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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