Every Amanita Dosage Chart Uses a Unit That Can't Carry a Dose
Search for an Amanita muscaria dosage guide and you'll find the same ladder everywhere: sub-threshold 0.1–0.5 g, low 0.5–1.5 g, moderate 1.5–3 g, strong 3–5 g. The numbers are stated to a tenth of a gram, which reads like precision. They're measured in dried mushroom mass, which is the problem — grams tell you how much material you weighed, not how much of the active compounds you swallowed. Published forensic analysis puts muscimol in A. muscaria caps anywhere from 46 to 1,052 parts per million, a 23-fold spread inside a single species (Tsujikawa et al., Forensic Science International, 2006). Run the ladder through that number and its tiers stop being tiers at all. This article does that arithmetic, traces where the gram figures came from, and sets out what's left that actually reduces risk.
It matters more than it used to. RAND's 2025 nationally representative survey of 10,122 U.S. adults put past-year Amanita muscaria use at roughly 3.5 million people, third behind psilocybin and MDMA (RAND Corporation, 2026). Millions of people are copying a chart nobody has ever validated.
Where Did the Gram Numbers Actually Come From?
Not from a clinical trial. There has never been a dose-ranging study of dried Amanita muscaria in humans, and the 2026 narrative review of the compound's place among novel psychoactive substances finds a clinical record built almost entirely on acute poisoning case reports (Ordak, Frontiers in Pharmacology, 2026). The gram ladder is folklore that hardened through repetition: one forum post cites another, a vendor page cites the forum, the next vendor page cites the vendor. Nothing in that chain ever touched a measurement.
The only human data with real numbers attached uses a different unit entirely. In 1978, Tamminga, Crayton and Chase gave pure muscimol to patients under double-blind, placebo-controlled conditions and reported effects by milligram: relaxation at low doses, and myoclonic twitching, somnolence and confusion as the dose climbed (American Journal of Psychiatry, 1978). That's the scale on which this compound is actually active — single-digit milligrams of one purified molecule. Every honest dose statement about muscimol in the pharmacological literature is in milligrams. Every dose statement in the consumer market is in grams of something else.
What Does One Gram of Dried Cap Actually Contain?
Convert the forensic figures and the gap becomes concrete. At 46–1,052 ppm, one gram of dried cap holds roughly 0.046 to 1.05 mg of muscimol. Ibotenic acid in the same samples ran from under 10 ppm to 2,845 ppm, so the same gram carries somewhere between about 0.01 and 2.85 mg of it (Tsujikawa et al., 2006). A broader 2023 survey of 84 samples across 24 Amanita species widened it further, finding ibotenic acid from 0.61 to 32.09 g/kg dry weight (Toxicon, 2023).
Nothing about this is fixable by weighing more carefully. Growing location and mushroom size showed no measurable influence on concentration in the Japanese analytical work, and a fruit body that grew to six times its earlier weight held roughly constant ibotenic acid concentration throughout (Tsunoda et al., 1993). Specimen-to-specimen variation dominates, and it isn't visible, smellable or weighable. Our breakdown of what lab analysis shows about potency covers the species and tissue side of that spread in detail.
Run the Ladder Through That Range and the Tiers Collapse
Here's the arithmetic almost nobody publishes. Take the standard ladder and express each tier in milligrams of muscimol, using the low and high ends of the measured concentration range:
- "Sub-threshold" 0.1–0.5 g → 0.005 to 0.53 mg muscimol
- "Low" 0.5–1.5 g → 0.023 to 1.58 mg
- "Moderate" 1.5–3 g → 0.069 to 3.16 mg
- "Strong" 3–5 g → 0.138 to 5.26 mg
Every tier overlaps every other tier. Completely. A 5-gram "strong dose" of low-concentration material delivers about 0.23 mg of muscimol — less than half the roughly 0.53 mg in a 0.5-gram "sub-threshold" dose of high-concentration material. The ladder can rank two portions of the same jar, and that's genuinely all it can do. Across jars, suppliers and seasons it can't rank anything. A chart whose categories can't be distinguished from one another isn't a dosing tool.
Which is also why the 0.1-gram increments are false precision twice over. A scale reading 0.1 g resolves to 100 mg of mushroom, roughly two orders of magnitude coarser than the milligram quantities that matter — and that mass isn't the quantity you care about anyway. We stock a 0.1 g precision scale and it's genuinely useful for portioning consistently, but we'd rather say plainly that it doesn't solve this. Our guide to preparation as a sampling problem works through what consistent portioning can and can't buy you.
Ibotenic Acid Is Half the Dose, and It Doesn't Track Muscimol
A dosage chart with one number implies one drug. Dried Amanita muscaria delivers at least two active compounds with opposite pharmacology: muscimol is a GABA-A agonist (inhibitory), while ibotenic acid is a glutamate agonist (excitatory) and the more neurotoxic of the pair, with muscimol roughly five to ten times more potent by weight (Michelot & Melendez-Howell, Mycological Research, 2003).
Drying converts some ibotenic acid into muscimol by decarboxylation, which is why dried material differs chemically from fresh (Tsunoda et al., 1993). The conversion is partial and depends on time, temperature and airflow — none of them standardised across suppliers. So "properly dried" describes a process, not a ratio. Two portions of identical weight and identical muscimol content can still carry very different ibotenic acid loads, and the second number is the one associated with nausea, cramping and the dysphoric end of the experience. One figure on a chart cannot represent two independent variables. Why does it get written as though it can?
Are "Caps" and "Grams" Interchangeable? No
The clinical literature mostly counts caps, not grams, and the counts are sobering. A 2022 case report in Wilderness & Environmental Medicine documented two severe poisonings including a fatality at four to five dried caps, with symptom onset between 30 minutes and 2 hours (Meisel et al., 2022). A 2025 Lithuanian series described four hospitalisations from intentional recreational use, one after three dried mushrooms, progressing to respiratory failure requiring mechanical ventilation (Acta Medica Lituanica, 2025).
Those case doses can't be converted into the gram ladder, and not only because of concentration spread. Dried cap mass isn't standardised either — caps sold as whole specimens vary widely in size, so "5 grams" and "five caps" describe different quantities that happen to share a digit. Treat any guide that swaps between the two units mid-paragraph as one that hasn't thought about it.
The Re-Dose Rule Is the Riskiest Line on Most Charts
"Wait 2–3 hours before considering more" appears on nearly every version of the ladder, and in our experience it's the instruction most likely to cause harm — because it sits right at the far edge of the documented onset window rather than safely past it. Meisel and colleagues recorded onset between 30 minutes and 2 hours; delayed absorption pushes some presentations later still. Someone who feels nothing at the 2-hour mark and re-doses may be adding a second unknown quantity to a first one that hasn't finished arriving.
The pharmacology makes stacking worse, not merely additive in a predictable way. GABA-A agonism is exactly the mechanism that alcohol, benzodiazepines and z-drugs act on, so combining any of them compounds central nervous system depression — which is why "never combine with alcohol or sedatives" is the one line on the standard chart that deserves to stay, and to be stated far more strongly than it usually is. If you're going to keep one rule from any dosage guide, keep that one. A single conservative amount with no re-dose window at all is the only version of the instruction that doesn't depend on a number nobody has.
What Still Reduces Risk When the Number Is Unknowable
Losing the dose chart doesn't leave you with nothing. It leaves you with the things that don't depend on knowing milligrams. Buy whole, intact, species-identifiable specimens rather than ground material or edibles — a CDC field investigation of six mushroom-gummy packages across five brands found unlabeled psilocybin or psilocin in four of them, plus undisclosed caffeine, ephedrine and mitragynine (CDC MMWR, 2024). With whole dried caps you at least have a known species and an unknown potency; with unlabeled extracts you may have an unknown everything.
Beyond that: treat every new batch as a fresh unknown regardless of how the last one felt. Change one variable at a time. Never stack with alcohol or sedative medication. Store it away from children and pets. Check your local law first, because the regulatory picture shifts — the FDA's 2024 scientific memorandum concluded that Amanita muscaria and its constituents don't meet the Generally Recognized as Safe standard and render conventional foods containing them adulterated (FDA, 2024), and our guide to the global legal landscape tracks where that stands. And none of this is treatment: Amanita muscaria is not an evidence-based therapy for anxiety, insomnia, ADHD or any diagnosed condition, and anyone considering it for one should talk to a healthcare professional first.
Frequently Asked Questions
What is the correct microdose of Amanita muscaria in grams?
There isn't one that can be stated honestly. Muscimol content in dried caps has been measured from 46 to 1,052 ppm (Tsujikawa et al., 2006), so any gram figure corresponds to a 23-fold range of actual compound. No dose-ranging study in humans has ever been conducted on dried Amanita muscaria.
How many milligrams of muscimol are in a gram of dried cap?
Roughly 0.046 to 1.05 mg, based on the 2006 forensic concentration range — plus somewhere between about 0.01 and 2.85 mg of ibotenic acid, which behaves differently in the body. Those two numbers vary independently, so no single figure describes the dose.
Why do all the dosage charts show the same numbers?
Because they're copied from each other rather than from data. The clinical record for this mushroom is built on acute poisoning case reports, not dose-ranging trials (Ordak, 2026). Repetition across hundreds of pages creates an impression of consensus that no measurement supports.
Does a 0.01 g precision scale solve the problem?
No. A finer scale measures mushroom mass more exactly, but mass was never the quantity in question. Determining active content requires destructive laboratory assay of the finished units — something no home method includes, at any scale resolution.
Are pre-made capsules more consistent than weighing caps yourself?
Only if whoever filled them pooled and blended the material properly, and labelling rarely says. Capsules shift the homogenisation problem to the manufacturer rather than removing it. Consistent unit weight isn't the same as consistent unit content.
How long should I wait before taking more?
The safer answer is not to re-dose within a session at all. Documented onset spans 30 minutes to 2 hours and can run later (Meisel et al., 2022), so the widely repeated "wait 2–3 hours" window overlaps the onset it's meant to clear.
What if a product lists muscimol content in milligrams?
That's the right unit, which is progress — but it's only as good as the testing behind it. Independent verification is rare, no agency checks potency claims on your behalf, and the FDA's 2024 position is the opposite of approval. Treat an unverified milligram figure as a claim rather than a measurement.
Bottom Line
The gram ladder isn't slightly imprecise — it's built on a unit that can't carry the information it claims to carry. Convert it with the published concentration range and all four tiers overlap, to the point where a "strong" five grams of weak material delivers less muscimol than a "sub-threshold" half gram of strong material. The only human dosing data with real numbers behind it is measured in milligrams of purified muscimol, and no product made from dried caps can be described in those terms without an assay. So the takeaway isn't a better chart. Batch-to-batch caution, single-variable changes, no sedative stacking and no in-session re-dosing are the parts of "dosing" that survive contact with the evidence — and anyone selling tenth-of-a-gram precision is selling a number they can't have. On why the word "microdose" transfers so poorly to this mushroom at all, our piece on what microdosing means for Amanita versus psilocybin picks up where this one ends, and our practical guide to mindful use covers the day-to-day side.
Amanita muscaria is not a proven treatment for anxiety, insomnia, ADHD, or any diagnosed condition; anyone considering it for those reasons should speak with a healthcare professional. Always research local regulations before purchase. This article is informational and is not medical advice.
About the author: Viktor writes about mushroom chemistry, sourcing, and safety for Amanita Store, with a focus on what published analytical data actually supports.