We sell all three Amanitas and we've already compared muscaria to each of them. This is the missing third side of the triangle, and researching it turned up something we didn't expect: PubMed indexes exactly one paper on Amanita regalis, and it's a 1979 report of three people who were poisoned by it after mistaking it for an edible parasol mushroom. Their symptoms included copious salivation and sweating — which is awkward, because our own product page sells regalis as muscarine-free.
Neither species supports a potency ranking, because the data doesn't exist. Tsujikawa's 2006 GC-MS analysis measured two Amanita pantherina caps at 1,554–1,880 ppm muscimol and 188–269 ppm ibotenic acid. For Amanita regalis, no published alkaloid quantification exists at all — the entire indexed clinical literature is Elonen's 1979 case report of three patients, two of whom showed cholinergic signs. What the comparison does establish is that both species are brown-capped, so both lose muscaria's red identification mark, and misidentification is the documented harm in both.
The interesting comparison here isn't which is stronger. It's that the two species most easily confused with each other are also the two most easily confused with something edible.
What Do We Actually Know About Amanita pantherina?
More than about regalis, though still not much. Tsujikawa's team quantified two pantherina caps from the Japanese market by gas chromatography–mass spectrometry: 188 to 269 ppm ibotenic acid and 1,554 to 1,880 ppm muscimol. Both exceeded every Amanita muscaria sample in the same study for muscimol.
On the clinical side, Moss and Hendrickson's 15-year poison-centre review included 10 pantherina cases against 23 muscaria, and pantherina was consistently the worse of the two: any GI symptoms in 80% of cases against 35%, CNS depression 70% against 35%, and CNS excitation 70% against 35%.
Two chemical samples and ten clinical cases. That's the entire evidential base for the species we describe as the strongest Amanita.
And Amanita regalis?
Effectively nothing, and the one thing there is doesn't flatter it. Searching PubMed for Amanita regalis returns a single record: Elonen, Tarssanen and Härkönen, published in Acta Medica Scandinavica in 1979.
Three patients ate varying amounts of the mushroom, all of them believing it was Macrolepiota procera, the parasol mushroom. Symptoms started one to two hours later. All three had marked gastrointestinal symptoms — nausea and heavy vomiting. Two developed central nervous system effects and cholinergic symptoms: hallucinations, confusion or loss of consciousness, alongside copious salivation or sweating.
Everyone recovered within 4 to 24 hours with no damage to liver, kidneys or central nervous system. The authors added one line that matters more than the rest: it appears cooking does not completely neutralise the toxic agents of Amanita regalis.
The Problem With Our Own Product Copy
Two of our pages take opposite positions on the same compound, and the evidence sides against the more expensive one.
Our regalis page sells the species as "muscarine-free", arguing that muscarine causes the unpleasant physiological effects and its absence makes for a cleaner experience. Our pantherina page lists muscarine as a benefit — "helps prolong sleep and improve its quality" with "an anti-ulcer effect".
Same molecule, sold as an asset on one page and as a liability worth paying to avoid on the other. Both claims can't be right, and the regalis one is contradicted by the only clinical record the species has.
The regalis page also states its muscimol concentration is typically higher than muscaria's. No published analysis has compared them, a point our regalis versus muscaria article already made.
Side by Side, Honestly
| Amanita pantherina | Amanita regalis | |
|---|---|---|
| Published alkaloid quantification | Two caps: 1,554–1,880 ppm muscimol, 188–269 ppm ibotenic acid | None |
| Indexed clinical literature | 10 poison-centre cases in one review | One 1979 report, three patients |
| Documented cholinergic signs | Present in the syndrome | Copious salivation or sweating in 2 of 3 |
| Cap colour | Brown to grey-brown with white warts | Brown to liver-brown with yellowish warts |
| Documented misidentification | Confused with edible and with muscaria | All three patients thought it was Macrolepiota procera |
| Recovery in the reported cases | Most symptoms under 24 hours; 5 of 34 intubated across both species | 4–24 hours, no organ damage |
| Our price per gram | €1.55–1.70 | €0.99–1.18 |
Why Losing the Red Cap Matters More Than Potency
Amanita muscaria has the most recognisable cap in mycology. A bright red cap with white warts is close to unmistakable, and that single visual fact does more for safety than any amount of written guidance.
Both pantherina and regalis give that up. A brown cap with pale warts sits in the same visual space as several edible species, and Elonen's three patients are the proof — they didn't misidentify regalis as a different Amanita, they misidentified it as dinner.
So the honest ranking of risk between these two isn't about muscimol at all. It's that each one costs you the identification shortcut, and neither has enough published chemistry to tell you what you're getting in exchange. Our pantherina ID guide and regalis identification article cover the structural markers that actually work.
Does Cooking or Drying Change the Comparison?
Partly, and not in the direction people hope. Drying decarboxylates ibotenic acid into muscimol, which reduces the nauseating excitatory component. Elonen's note that cooking didn't neutralise the toxins fits what's known about muscarine: it's thermostable and survives heat intact.
That means processing shifts the ibotenic-to-muscimol balance in both species while leaving the cholinergic fraction untouched. Our pantherina drying article works through why the muscaria protocol doesn't transfer cleanly to either of these.
Which Would We Actually Recommend?
- Neither, as a first Amanita. Start with muscaria if you're going to start at all — it has the most chemistry published, the most clinical data, and a cap you can identify.
- If you want the species with some measured chemistry, that's pantherina — two samples, which is thin, but it beats zero.
- Don't buy regalis for the muscarine-free claim. It's the one claim in our catalogue that a published paper directly contradicts, and we'd rather you knew that.
- Buy capsules or whole caps, not powder, for either species. Powder removes your ability to check what you have, and for brown-capped Amanitas that check matters more.
- Recalibrate from a low dose with every batch of either. With this little published data, your own log is better evidence than anything on a label.
- Never forage either one. Both documented harm patterns start with someone who was confident about what they'd picked.
What Would Settle This
A per-batch certificate of analysis reporting muscimol, ibotenic acid and muscarine for each species. Nobody in this trade publishes that as standard, us included, and until someone does, every potency comparison between these two mushrooms is assertion.
We'd also welcome anyone quantifying regalis at all. A species sold across Europe on a specific chemical claim, with zero published measurements behind it, is not a satisfactory state of affairs — and saying so is more useful than repeating the claim.
Frequently Asked Questions
Which is stronger, Amanita pantherina or Amanita regalis?
Nobody knows. Two pantherina caps have been measured at 1,554–1,880 ppm muscimol; regalis has never been quantified in published literature. Any ranking between them, including the ones on product pages, is assertion rather than measurement.
Is Amanita regalis really muscarine-free?
The claim is contradicted by the only clinical paper on the species. Two of the three patients in Elonen's 1979 report had copious salivation or sweating — textbook muscarinic signs — and the authors noted cooking did not fully neutralise the toxins.
Which one is more dangerous?
Pantherina has more documented cases and was the more symptomatic species in a poison-centre review, with GI symptoms in 80% of cases against muscaria's 35%. But regalis's documented harm came from misidentification, which is a different and arguably more common failure mode.
Can you tell them apart in the field?
With difficulty, and that's the point. Both are brown-capped with pale warts, neither has muscaria's unmistakable red, and all three patients in the regalis report thought they had picked an edible parasol mushroom. Neither is a foraging species for non-experts.
Does drying make either one safer?
Only partly. Drying converts ibotenic acid to muscimol, reducing the nauseating phase. Muscarine is thermostable and survives it, which fits the 1979 observation that cooking regalis did not neutralise its toxic agents.
Shop Amanita pantherina and regalis
Dried Amanita pantherina (50 g €85, 100 g €155) and pantherina capsules (120 caps €79) cover the species with some measured chemistry. Amanita regalis caps (50 g €59, 100 g €99) are cheaper per gram — buy them for rarity and appearance, not for the muscarine claim. If you're new to this genus, Amanita muscaria Grade A (100 g €79) is the better starting point. Read who should avoid these species first. Free shipping on orders over €50.
Related Articles
- Amanita pantherina vs Amanita muscaria
- Amanita regalis vs Amanita muscaria
- Amanita regalis Explained
- Amanita pantherina Identification Guide
- Amanita pantherina Drying and Decarboxylation
- Amanita pantherina Active Compounds
- Who Should Avoid Amanita pantherina
Sources
- Elonen E, Tarssanen L, Härkönen M. Poisoning with brown fly agaric, Amanita regalis. Acta Med Scand. 1979;205(2):121-123. PubMed 760400
- Tsujikawa K, Mohri H, Kuwayama K, et al. Analysis of hallucinogenic constituents in Amanita mushrooms circulated in Japan. Forensic Sci Int. 2006;164(2-3):172-178. PubMed 16464551
- Moss MJ, Hendrickson RG. Toxicity of muscimol and ibotenic acid containing mushrooms reported to a regional poison control center from 2002-2016. Clin Toxicol (Phila). 2019;57(2):99-103. PubMed 30073844
- Feeney K, Kababick J, Wise S. An examination of cholinergic symptoms produced by the fly agaric mushroom Amanita muscaria (Agaricomycetes): revisiting the role of muscarine. Int J Med Mushrooms. 2025;27(7):1-15. PubMed 40228215
- Michelot D, Melendez-Howell LM. Amanita muscaria: chemistry, biology, toxicology, and ethnomycology. Mycol Res. 2003;107(2):131-146. PubMed 12747324