---
title: "Scientists Unlock the Recipe for the Psychedelic Beer Consumed in the Eleusinian Mysteries"
description: "The Eleusinian Mysteries were annual celebrations that took place in the autumn, approximately twenty kilometers west of Athens, at a sanctuary dedicated to the goddesses Demeter and Persephone."
url: https://www.thebeertimes.com/en/psychedelic-effects-of-kykeon-in-the-eleusinian-mysteries/
date: 2026-02-18
modified: 2026-02-22
author: "Carlos Uhart M."
image: https://www.thebeertimes.com/wp-content/uploads/2026/02/Elaboracion-de-Kykeon-en-los-misterios-de-Eleusis.jpg
categories: ["Culture"]
tags: ["Culture", "History", "Psychedelics"]
type: post
lang: en
---

# Scientists Unlock the Recipe for the Psychedelic Beer Consumed in the Eleusinian Mysteries

For nearly two millennia, the [Eleusinian Mysteries](https://www.thebeertimes.com/en/kykeon-and-the-eleusinian-mysteries-in-greece-an-ancestral-psychedelic-beer/) constituted the most important esoteric tradition of classical antiquity, drawing pilgrims from across the Mediterranean to participate in rituals that promised a profound transformation of consciousness and a new understanding of life and death.

![Preparation of Kykeon in the Eleusinian Mysteries](https://www.thebeertimes.com/wp-content/uploads/2026/02/Elaboracion-de-Kykeon-en-los-misterios-de-Eleusis.jpg)*Preparation of kykeon*

At the heart of this initiatory experience was the kykeon, a ceremonial beverage whose exact composition remained shrouded in mystery for centuries.

Now, an international team of researchers led by the National and Kapodistrian University of Athens has provided experimental evidence supporting one of the most fascinating hypotheses about this sacred elixir: that it contained a potent psychedelic derived from the ergot fungus, and that the priestesses of Eleusis possessed the technological knowledge to transform a toxic fungus into a substance capable of inducing visionary experiences.

## The Historical Context and the Ergot Hypothesis

The Eleusinian Mysteries were annual celebrations held in the autumn, approximately twenty kilometers west of Athens, at a sanctuary dedicated to the goddesses Demeter and Persephone.

The central rite involved the ingestion of kykeon, a kind of beer whose main ingredients, according to the Homeric Hymn to Demeter, were water, barley, and mint.

The initiates, after a nine-day fasting period, would utter the sacred formula “I have fasted, I have drunk the kykeon” before experiencing what ancient sources describe as a transcendental revelation about death and the afterlife.

The poet Pindar would write centuries later:

> Blessed is he who, after beholding these rites, goes beneath the earth; he knows the end of life and knows its divine beginning.

In the 1970s, mycologist R. Gordon Wasson, chemist Albert Hofmann (who synthesized LSD), and classicist Carl A. P. Ruck proposed that the active agent in kykeon might have been ergot, the fungus Claviceps purpurea that infects cereals.

This hypothesis, however, faced a fundamental objection: ergot is extremely toxic.

Its accidental consumption throughout history has caused epidemics of ergotism, a disease known in the Middle Ages as St. Anthony’s Fire, characterized by terrible hallucinations, convulsions, dry gangrene of the extremities, and massive mortality, such as the Paris epidemic of 1418 that claimed fifty thousand lives.

The question researchers needed to answer was how the ancient Greeks could have used this deadly substance without suffering its devastating effects.

## The Archaeological Discovery

The archaeological find that revitalized this hypothesis came from an unexpected site: Mas Castellar de Pontós, near the ancient Greek colony of Emporion in present-day Catalonia.

In a sanctuary dedicated to the two Eleusinian goddesses, archaeologists discovered fragments of ergot inside a ceremonial vase and, notably, in the dental calculus of a twenty-five-year-old man, providing direct evidence of the consumption of this fungus in ritual contexts associated with the deities of Eleusis.

This discovery demonstrated that, at some time and place in antiquity, ergot was connected to the cult of Demeter and Persephone, although it did not explain how its toxicity was avoided.

## Recreating an Ancient Technique?

The key to solving this puzzle lay in a suggestion initially made in the appendix to the thirtieth-anniversary edition of “The Road to Eleusis”: that the ancient Greeks might have used a simple alkaline preparation, made with water and ashes, to hydrolyze the toxic ergopeptides present in ergot, transforming them into simpler, psychoactive lysergic acid amides, such as LSA (lysergic acid amide) and its epimer iso-LSA.

The ancient Greeks were familiar with alkali-based medicines, lending historical plausibility to the possibility that the Eleusinian priestesses had empirically developed this method.

To subject this hypothesis to experimental testing, the researchers designed a full factorial study that would systematically evaluate the parameters of this reaction.

The selected variables were the initial pH of the lye (10.5, 11.5, and 12.5), the concentration of powdered ergot in the lye (5, 10, and 20% weight/volume), and the reaction time (15, 30, 60, and 120 minutes) at boiling temperature.

Control samples were prepared using distilled water instead of lye, and all samples were analyzed using thin-layer chromatography, proton nuclear magnetic resonance spectroscopy, and ultra-high-performance liquid chromatography coupled with high-resolution quadrupole time-of-flight mass spectrometry.

## Lye Preparation and Ergot Identification

The lye used in the experiments was prepared following a method that would have been within the reach of the Eleusinian priestesses. Dry wood chips from oak and olive trees were incinerated at six hundred degrees Celsius to produce ash, which was then boiled in distilled water at a ratio of one part ash to two parts water.

After settling overnight, the supernatant was decanted and filtered, yielding a lye solution with an initial pH of 12.5.

The solutions with pH 10.5 and 11.5 were prepared by exposing aliquots of the primary solution to atmospheric air for two and five days, respectively, allowing atmospheric carbon dioxide to gradually neutralize the alkalinity.

The ergot used in the experiments was identified micromorphologically and molecularly.

## Analysis of the Chemical Transformation

When analyzing the samples with a technique called nuclear magnetic resonance, scientists could see exactly which chemical substances were present.

In the samples that did not receive lye treatment—that is, those only boiled in water—the signals from the toxic ergot compounds, mainly ergocristine and ergocryptine, were clearly observed.

In contrast, in the samples treated with the most concentrated lye, those toxicity signals disappeared completely.

And more importantly, in their place appeared the characteristic signals of two new substances, LSA and iso-LSA, which are psychoactive compounds and much less dangerous.

This change in chemical signals demonstrated beyond doubt that the lye treatment had transformed the poisonous molecules into others with psychedelic properties.

## Confirmation by Mass Spectrometry

To confirm more precisely what was seen in the nuclear magnetic resonance analysis, the researchers used a more advanced technique called UHPLC coupled with mass spectrometry, which allows for the identification and measurement of each substance individually.

The results were conclusive. In the samples treated with the strongest lye for 120 minutes, none of the poisonous ergopeptides like ergotamine or ergocristine were present.

They had all disappeared, completely transforming into LSA and iso-LSA. The only thing left were traces of ergometrine, a much safer substance that has actually been used in medicine.

Exact measurement showed that, under ideal conditions, for every gram of ergot, 0.54 milligrams of LSA and 0.48 milligrams of iso-LSA were obtained.

The researchers also discovered that even larger amounts could be obtained if more ergot or shorter times were used, but in those cases, not all toxic compounds were completely eliminated, making the mixture less safe.

For example, using more ergot, they obtained up to 1.15 milligrams of LSA, but traces of dangerous substances still remained.

This confirmed that the optimal conditions for achieving a clean and safe beverage were precisely those they had identified: a very high pH, a small amount of ergot, and two hours of boiling.

## Statistical Modeling of the Responses

To ensure the results were not due to chance, the researchers subjected all data to statistical analysis. This analysis confirmed that the results were robust and that the only variable that truly mattered was the alkalinity level of the lye.

Neither the amount of ergot used nor the cooking time, by themselves, had a decisive impact if the pH was not adequate.

In simple terms, what determines whether the chemical transformation occurs is how basic the mixture is, and this effect follows a predictable pattern: increasing alkalinity improves the result up to a certain optimal point, beyond which it ceases to be relevant because the reaction is already complete.

The mathematical models developed from the experiments proved to be very accurate in predicting the amount of LSA and iso-LSA obtained under each condition.

This means that scientists not only verified that the method works, but can also calculate in advance how much psychoactive compound will be produced if the pH and other parameters are known.

This statistical precision reinforces the validity of the finding and rules out the possibility that the results are due to chance or experimental errors.

## Understanding the Eleusinian Mysteries

The results of this study demonstrate that it is possible to transform the toxic ergopeptides of ergot into psychoactive compounds through a simple lye treatment process, exactly as Wasson, Hofmann, and Ruck suggested nearly half a century ago.

The persistence of traces of ergometrine and ergometrinine does not compromise the safety of the preparation, as these compounds are simple lysergic acid amides with a well-characterized medicinal profile and significantly lower peripheral vasoconstrictive toxicity than complex ergopeptides.

In the context of the Eleusinian Mysteries, detoxification primarily involved the elimination of lethal ergopeptides, a requirement that lye treatment satisfactorily fulfills.

A legitimate concern about this hypothesis is the potability of the resulting preparation, as a solution with a pH above 11.5 is highly caustic for oral consumption and can damage the esophageal epithelium.

However, the researchers demonstrated that the highly basic initial pH can be neutralized by exposure to atmospheric carbon dioxide and by the addition of the ergot powder, while maintaining the reaction yield.

Adding the resulting solution to the barley and mint preparation, which is typically slightly acidic, would further neutralize the pH, making the kykeon safe to drink.

## The Composition of Ancient Ergot

Regarding the origin and composition of the ergot used in antiquity, comparative phylogenetic and genomic analyses indicate that ergopeptide biosynthesis arose in the Claviceps purpurea lineage after the genus diversified in the Paleocene-Eocene, approximately fifty-six to thirty-four million years ago, through the recruitment of the lpsA/lpsB non-ribosomal peptide synthetases into the ancestral ergot alkaloid pathway.

This evolutionary timescale addresses the concern expressed by Hofmann about the impossibility of knowing the chemistry of ergot cultivated on the Rarian plain during the second millennium BC.

Considering the cosmopolitan distribution of Claviceps purpurea and the evolutionary scale, two millennia represent an insignificant interval, so the ergot that infected ancient Eleusinian barley likely contained the same major classes of ergopeptides as modern strains.

Even if minor compositional differences existed, all ergopeptides ultimately hydrolyze into the same lysergic acid amides, accompanied only by harmless amino acid byproducts.

## What Quantities Were Needed for the Ritual?

Regarding the amounts of ergot required for the ritual, the average ergot alkaloid content in the sclerotia of Claviceps purpurea sensu lato is a few milligrams per gram, typically in the range of 0.01 to 1.3 milligrams per gram, and can reach up to 2.88 to 7.26 milligrams per gram in some cases.

The minimum effective dose of pure LSA is approximately 0.5 milligrams, and up to two thousand participants could attend the Eleusinian initiations simultaneously.

Consequently, the temple priestesses would likely have needed a few kilograms of sclerotia, along with twenty times that amount of freshly prepared lye solution.

These quantities could have been easily obtained and processed within the secrecy of the temple. Given that the results showed a production of 0.54 milligrams of LSA and 0.48 milligrams of iso-LSA per gram of ergot under optimal conditions, approximately one gram of ergot would have been sufficient for each initiate.

The required amount could have been even smaller, considering the nine-day fasting period observed by initiates before consuming the kykeon and the intensification of effects in a ritual context.

## The Synergistic Role of Mint?

Finally, the researchers propose a possible synergistic role for the constituents of pennyroyal mint, identified as Mentha pulegium, beyond the merely aromatic.

The main monoterpene component of pennyroyal essential oil, (R)-(+)-pulegone, is known to interact with central nervous system pathways involved in nociception, sedation, psychotropic activity, and analgesia.

Furthermore, its aqueous extract, rich in rosmarinic acid, modulates monoamine oxidase A, suggesting nootropic and mood-stabilizing effects.

It is proposed that these secondary metabolites could contribute to a psycho-stimulating and synergistic “entourage” effect with LSA and iso-LSA, analogous to the synergy between terpenes and THC in cannabis or between DMT and β-carbolines in ayahuasca, possibly reducing anxiety and prolonging the entheogenic effects.

This hypothesis, however, requires validation through specific co-administration studies.

## Conclusions and Future Perspectives

This study provides the first experimental evidence that toxic ergopeptides can be chemically transformed into psychoactive substances through an ancient process involving a lye reaction, a technique that could have been employed by the ceremonial priestesses of Eleusis.

The results strongly support the hypothesis that the entheogenic properties of kykeon could be attributed to the use of ergot, as suggested by R. Gordon Wasson, Albert Hofmann, and Carl A. P. Ruck nearly half a century ago.

It is important to note that the purpose of this work was not to establish a novel analytical method for the quantification of LSA and iso-LSA, nor to optimize hydrolysis conditions using response surface methodology, nor to reassess the pharmacological properties of ergot alkaloids, LSA, and iso-LSA, which are already well-documented.

Rather, the study’s focus was to demonstrate the feasibility of this transformation within the specific historical-technological context under investigation, an objective that has been successfully achieved.

Looking ahead, the researchers anticipate that applying advanced organic residue analysis techniques to existing and future archaeological finds from the site of Eleusis could provide the material evidence needed to further corroborate and enrich the “psychedelic Eleusis” hypothesis.

In the meantime, this study represents a significant milestone in our understanding of one of antiquity’s most mysterious and influential rituals, demonstrating that empirical knowledge of the properties of plants and fungi, transmitted through generations of priests and priestesses, may have reached a level of sophistication at Eleusis that we are only beginning to fully comprehend.

## Frequently Asked Questions (FAQ)

### 1. Is kykeon the same as modern LSD?

Although they share a chemical basis, they are not the same. LSD (lysergic acid diethylamide) is a synthetic substance created in a laboratory, while kykeon contained LSA (lysergic acid amide), a natural compound found in ergot. LSA produces similar visionary and sedative effects but is generally less potent and has a different physical character compared to pure LSD.

### 2. Why didn’t the initiates at Eleusis die from ergotism?

The key lies in alkaline hydrolysis. According to recent research, the priestesses used a lye solution (water mixed with ashes) to cook the fungus. This chemical process transformed the toxic and lethal alkaloids of ergot, responsible for “St. Anthony’s Fire,” into psychoactive compounds safe for human consumption in controlled doses.

### 3. What other ingredients did Kykeon contain besides the fungus?

The traditional recipe mentioned in the Homeric Hymn to Demeter consisted of water, barley, and pennyroyal mint (Mentha pulegium). Current research suggests that mint was not just a flavoring agent, as it contains pulegone and rosmarinic acid, substances that could have acted synergistically with the psychedelic to reduce anxiety and enhance the trance state.

### 4. Is there archaeological evidence for the use of ergot in Greek rituals?

Yes. The most significant find occurred at Mas Castellar de Pontós (Spain), a settlement linked to the Greek colony of Emporion. There, remains of ergot were found inside a ceremonial vase and in the dental tartar of an individual, confirming that the use of this fungus was integrated into the cults dedicated to Demeter and Persephone outside of Athens.

### 5. How many people participated in the rituals and how much brew was prepared?

It is estimated that up to 2,000 people could be initiated simultaneously each year in the Telesterion at Eleusis. To supply such a crowd, the priestesses would have only needed to process a few kilograms of ergot, as approximately one gram of the treated fungus per person was required to induce the mystical experience after the long ritual fast.

## References

Antonopoulos, R. K., Dadiotis, E., Ioannidis, K., Cheilari, A., Mitsis, V., García-Campaña, A. M., Gámiz-Gracia, L., Hernández-Mesa, M., Narváez, A., Hoffman, M. A., Ruck, C. A. P., Gonou-Zagou, Z., Aligiannis, N., & Magiatis, P. (2026). Investigating the psychedelic hypothesis of kykeon, the sacred elixir of the Eleusinian Mysteries. *Scientific Reports*. [https://doi.org/10.1038/s41598-026-39568-3](https://doi.org/10.1038/s41598-026-39568-3)

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