What Is Microdosing?

Microdosing means taking a very small amount of a psychedelic, far below the amount that produces a full experience, usually on a regular schedule over several weeks. With psilocybin mushrooms, the aim is a dose so small that you can go about a normal day: work, exercise, conversation, chores. Most people describe a well-judged microdose as barely noticeable, or not noticeable at all.

Microdosing has moved from a niche practice to a mainstream conversation in little more than a decade. That popularity has outpaced the science. This guide explains what microdosing is, where the idea came from, what careful research has found so far, and how people who choose to microdose approach it as safely and honestly as possible.

Where the idea came from

Small doses of psychedelics were discussed by researchers as far back as the mid-twentieth century, but the modern practice owes most to the American psychologist James Fadiman. In his 2011 book The Psychedelic Explorer's Guide, Fadiman described a simple protocol and invited people to report their experiences. The protocol that now bears his name involves taking a microdose on one day and then having two days off, with the days in between serving as a comparison.

The mycologist Paul Stamets later popularized a different approach, sometimes called the Stamets stack, which combines a psilocybin microdose with lion's mane mushroom and niacin (vitamin B3), typically taken four or five days a week followed by days off. Stamets has also co-authored observational research on people who microdose, which we discuss below.

How small is a microdose?

There is no official definition, but a microdose is usually described as somewhere around one twentieth to one tenth of a typical full dose. For dried Psilocybe cubensis, that is often expressed as roughly 0.05 to 0.25 grams, and many people start at the very bottom of that range or below it. Because psilocybin content in dried mushrooms commonly varies by a factor of two or more between batches, a dose that is invisible from one bag can be noticeable from another.

That variability is the main reason many people prefer pre-measured capsules. They take the scale out of the equation and make each dose day more consistent. Our microdose shelf lists capsules from several makers. Always read the label for the amount per capsule, and remember that different brands are not interchangeable.

A practical test: if you clearly feel altered, see visual changes, or find it hard to concentrate, that was more than a microdose. Take less next time.

Why people microdose

People who microdose describe a wide range of reasons: wanting to feel more present, more creative, more focused or more emotionally balanced, or simply curious about a practice they have read about. Large online surveys have collected thousands of these self-reports. Self-reports are valuable for understanding why people do something, but they cannot tell us whether the effects come from the psilocybin itself, from expectation, or from the routine of paying closer attention to one's own life.

We think it is important to be clear about this. Microdosing is not an approved treatment for anything in Canada, and nothing in this guide is medical advice. If you are struggling with your mental health, please speak with a health professional.

What the research actually shows

The most informative studies on microdosing are the ones that use a placebo, because expectations are powerful when people know what they have taken.

In 2021, Balázs Szigeti and colleagues at Imperial College London published a creative "self-blinding" citizen science study in the journal eLife. Participants who already microdosed prepared their own capsules, some containing their usual microdose and some empty, and mixed them up using a protocol so they did not know which they were taking on any given week. Across 191 people who completed the study, measures of well-being improved over the four weeks, but the improvement was similar whether people were taking microdoses or placebos. Participants also tended to score higher when they believed they had taken a microdose, whether or not they had.

A smaller, laboratory-style study by Federico Cavanna and colleagues, published in Translational Psychiatry in 2022, gave 34 volunteers either 0.5 grams of dried mushroom or a placebo in a double-blind design. The active dose produced stronger subjective effects than placebo, but mainly among participants who correctly guessed which they had taken. The researchers found no evidence of improved creativity, cognition or well-being, and concluded that expectation likely accounts for at least some of the benefits people report.

Other research points in a more positive direction, but with important caveats. In 2022, Joseph Rootman and colleagues, with Paul Stamets among the authors, published an observational study in Scientific Reports that followed 953 people who microdosed psilocybin and 180 who did not for about a month. The microdosing group reported small to medium improvements in mood and mental health compared with controls. The authors were clear about the limits of the design: participants were self-selected, knew whether they were microdosing, and the study was not placebo-controlled.

Taken together, the honest summary is that the research is early and mixed. Some people report benefits, and those reports deserve to be taken seriously as experiences. The best-controlled studies so far suggest that expectation plays a large role. Larger, longer clinical trials are under way, and our understanding may well change.

Popular schedules

Whichever routine you choose, the common thread is regular days off. Tolerance to psilocybin builds quickly, and breaks keep a routine from drifting upward in dose.

The Fadiman protocol: one dose day followed by two days off, repeated. Simple, with plenty of rest and built-in comparison days.
Every other day: one day on, one day off. Some people find this easier to remember.
The Stamets approach: four or five days on, then two or three days off, often alongside lion's mane and niacin.
Intuitive dosing: dosing only on chosen days once you know how you respond. Best saved for people with some experience of a structured schedule.

Many people follow a schedule for four to eight weeks and then take a break of two to four weeks before deciding whether to continue. A break is also a good time to notice whether anything feels different without the routine.

A simple way to start

If you decide to microdose, a careful first month might look like this. Begin with the smallest available capsule or amount. Take your first dose on a quiet day at home, not a workday, so you can see how it affects you. Choose a schedule and stick to it for a few weeks rather than changing several things at once. Avoid driving on dose days until you are confident it does not affect you.

Keep a journal

A journal is the most useful tool in microdosing, precisely because expectations are so powerful. A few lines a day is enough: whether it was a dose day, how you slept, your mood and energy on a simple scale, and one sentence about anything you noticed. After a few weeks, compare dose days with rest days and with your break weeks. You may find clear patterns, or you may find that the routine of paying attention was the most valuable part. Both are worth knowing.

Some people go one step further and borrow from the Szigeti study by asking a friend to mix a few look-alike placebo capsules into a week. It is an honest way to test your own impressions.

Functional mushrooms and stacks

Many microdose capsules blend psilocybin with functional mushrooms such as lion's mane, reishi or cordyceps, or with other botanicals. Functional mushrooms do not contain psilocybin and are sold widely as supplements. Research on them is ongoing, and claims made about them often go beyond the evidence. If you are interested in them on their own, see our supplements shelf, and always read the full ingredient list of any blend, especially if you have allergies or take medication.

Interactions and who should not microdose

A microdose is still psilocybin, so the same cautions apply as for larger doses, even if the risks are lower.

Antidepressants: SSRIs and SNRIs can blunt the effects of psilocybin, and people sometimes respond by taking more. Never stop or change an antidepressant on your own, as discontinuation can cause its own problems. Talk to your prescriber.
Lithium: a review of online reports led by Johns Hopkins researchers found that nearly half of reports describing lithium combined with a classic psychedelic involved seizures. Do not combine them.
MAOIs: these can intensify and prolong psilocybin's effects. Avoid the combination unless a doctor has advised otherwise.
Other medications: antipsychotics, some heart medications and other serotonergic drugs can also interact. Ask a pharmacist.

Do not microdose if you are under 19, pregnant or breastfeeding, or have a personal or close family history of psychosis, schizophrenia or bipolar disorder. Our safety guide covers these points in more depth.

Possible downsides

People who microdose sometimes report anxiety, restlessness, trouble sleeping, headaches or stomach upset, especially if the dose is too high. Some notice irritability on the day after a dose. Psilocybin can also cause small, temporary increases in heart rate and blood pressure. Researchers have raised questions about very long-term, frequent use of drugs that act on serotonin receptors, including the 5-HT2B receptor linked to heart valve health, but this has not been well studied in people who microdose psilocybin (Tagen et al., 2023). That uncertainty is one more reason to use regular breaks and to avoid indefinite daily use.

The law in Canada

Microdosing does not change the legal status of psilocybin. It remains a controlled substance under the Controlled Drugs and Substances Act, with limited legal access through clinical trials, section 56 exemptions and Special Access Program requests made by health care practitioners. Our magic mushrooms guide explains these pathways.

The bottom line

Microdosing is a small practice surrounded by big claims. Approach it with curiosity and humility: start very low, follow a schedule with real breaks, keep honest notes, take medication interactions seriously and stay open to the possibility that what you notice is partly the power of attention and expectation. That is not a reason to dismiss your experience. It is a reason to understand it clearly.

Sources

This guide is general information, not medical or legal advice.

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