Fermented Grain Drinks in Ayurveda: Sura, Maireya, and the Therapeutic Use of Fermented Beverages

Rohan Kapoor — Fri, 05 Jun 2026 07:30:00 +0000

When I first encountered Ayurveda’s discussions of fermented beverages, the most striking feature was not a single recipe but the range of distinctions the texts make. The Charaka Samhita does enumerate eighty-four selected asava preparations, but it does not present them as eighty-four grain drinks arranged like a modern pharmaceutical catalogue. In Sutra Sthana 25, the number arises from source materials drawn from grains, fruits, roots, pith or heartwood, flowers, branches, leaves, bark, and sugar. Charaka also states that further combinations of ingredients and processing methods could produce innumerable variations.

The classical literature therefore treats fermentation as both food processing and medicine-making. It distinguishes cereal-derived intoxicating drinks, sour grain ferments, and self-fermented herbal formulations. It also treats alcohol as a substance whose effects change with its ingredients, preparation, age, quantity, timing, accompanying food, the drinker’s strength, and habituation. These are traditional Ayurvedic descriptions rather than modern clinical proof, but they demonstrate close attention to preparation, individual suitability, and the consequences of misuse.

Where the Classical Material Actually Appears

The principal Charaka passages are distributed across Sutra Sthana 25, which enumerates the selected asavas; Sutra Sthana 27, whose Madya Varga compares fermented and sour preparations; and Chikitsa Sthana 24, which discusses appropriate drinking, intoxication, susceptibility, and treatment of madatyaya. The Sushruta Samhita discusses liquid substances, including fermented beverages, in Sutra Sthana 45—not in Sharira Sthana.

Term	Verified Description	Important Correction
Asava	A broad self-fermented preparation. Charaka lists several possible source materials and says its effects depend on the ingredients and processing.	The eighty-four selected asavas are not all grain beverages or eighty-four fully standardized modern recipes.
Sura	A cereal-derived alcoholic preparation, commonly associated in later Ayurvedic pharmaceutic descriptions with cooked grain and a fermenting starter.	Charaka Chikitsa Sthana 24 does not give the claimed sesame-oil recipe or a universal three-to-seven-day fermentation schedule.
Prasanna	The clear upper or supernatant portion associated with sura in Ayurvedic pharmaceutic literature.	It is not simply rice-cooking water left overnight.
Arishta	A medicated fermented preparation. In later pharmaceutical usage, the principal herbs are generally first prepared as a decoction and fermented with a sweetening material.	Its therapeutic indication depends on the complete formula, not on fermentation alone.
Asava in later pharmacy	Generally prepared without first converting the principal herbal material into a decoction; the exact liquid, herbs, sweetening agent, and fermentation procedure vary by formula.	Defining every asava as fermented raw herbal juice is too narrow.
Kanjika or Dhanyamla	A sour fermented cereal liquid described separately from intoxicating grain beverages.	A modern carrot-and-mustard kanji recipe should not be presented as a verbatim classical formula without a textual source.

Sura and the Meaning of Madya

Madya is a broad term for intoxicating fermented drink, whereas sura is one cereal-derived member of that larger group. Charaka’s Madya Varga separately discusses sura, madira, jagala, arishta, maireya, dhātakyasava, sauviraka, tushodaka, and amla-kanjika. The text describes maireya as sweet and heavy, while dhātakyasava is listed separately and described as mild, dry, and appetizing. Maireya therefore cannot be defined simply as barley fermented with Dhataki flowers.

Charaka states that fresh liquor is generally heavy and liable to aggravate the doshas, whereas properly aged liquor is described as lighter, appetizing, digestive, and channel-clearing. In Chikitsa Sthana 24, madya is assigned ten qualities: laghu, ushna, tikshna, sukshma, amla, vyavayi, ashu, ruksha, vikashi, and vishada. The same chapter warns that alcohol used improperly or excessively can act like poison.

The text also recognizes differences in susceptibility. It describes hungry, thirsty, weak, emaciated, exhausted, angry, frightened, and unaccustomed individuals, as well as those taking little or dry food, as liable to become intoxicated rapidly. Classical Ayurveda consequently does not treat fermented alcohol as a universally strengthening or digestion-promoting substance. Quantity, context, constitution, strength, food, and habituation remain essential considerations.

Asava, Arishta, and the Role of Dhataki

In later Ayurvedic pharmacy, asava and arishta are self-fermented herbal dosage forms. A fermentable carbohydrate source such as jaggery, sugar, or honey supports microbial activity and generates ethanol within the preparation. The self-generated ethanol can assist the extraction of both water-soluble and alcohol-soluble constituents and contributes to preservation. The ingredients, proportions, vessel, duration, and quality-control requirements must nevertheless be taken from the authoritative formula for the individual medicine; a single thirty-day fermentation rule cannot be applied to every asava or arishta.

Dhataki flowers, obtained from Woodfordia fruticosa, occur in many but not all asava-arishta formulations. Laboratory investigations have isolated alcohol-producing yeasts and other microorganisms from the flowers and indicate that this associated microbial community can assist fermentation. It is therefore reasonable to describe Dhataki as a traditional fermentation aid where a formula includes it. It is not accurate to describe the flowers merely as a packet of “fermentation enzymes,” nor does the detection of compounds such as ellagic acid prove a particular clinical benefit in every finished medicine.

Each named asava or arishta remains a distinct formulation with its own ingredients, processing instructions, dose, and traditional indications. Fermentation alone does not make different products interchangeable. Manufacturing quality also matters. An analytical investigation of marketed Kumaryasava and Mustakarishta samples reported variation in measured ethanol values and emphasized the need for appropriate standardization and quality control.

What Modern Fermentation Science Can—and Cannot—Confirm

Fermentation may involve lactic-acid bacteria, yeasts, or mixed microbial communities, depending on the substrate, starter, temperature, time, hygiene, and other processing conditions. It can change acidity, flavour, preservation, nutrient availability, and plant chemistry. However, the word “fermented” does not automatically mean “probiotic.” Scientific consensus reserves the term probiotic for identified live microorganisms that have been shown, in adequate amounts, to confer a health benefit.

Microbial identity matters: Sour taste, bubbles, or a traditional name cannot establish which species or strains are present, whether they remain alive, or whether they are safe.
Health effects are product-specific: Findings from one controlled ferment cannot automatically be transferred to sura, kanjika, rice water, or a medicated asava-arishta.
Nutritional claims require analysis: Fermentation may alter vitamins, starches, amino acids, and other compounds, but it does not guarantee clinically important quantities or effects.

No verifiable 2018 systematic review was located that matched the original claim that traditional Asian grain beverages broadly demonstrated anti-inflammatory, immune-modulatory, and gut-protective effects in humans. Reviews of fermented foods support their microbial diversity and research potential, but evidence for clinical outcomes remains dependent on the particular food, organisms, process, dose, and population studied. Classical terms such as dipana and vata-shamana should not be translated directly into unproven claims about microbiome diversity, intestinal permeability, or probiotic efficacy.

Kanjika Is Not the Same as Every Modern Kanji Recipe

The carrot, mustard, salt, grain, and water recipe supplied in the original article was not verified as a formula from the Ashtanga Hridaya. Classical amla-kanjika, dhanyamla, sauviraka, and tushodaka belong to a vocabulary of sour cereal preparations and are discussed separately. Charaka describes amla-kanjika as sour and attributes appetizing, digestive, and laxative actions to it, while sauviraka and tushodaka receive their own descriptions. A household vegetable ferment may be a legitimate culinary tradition without being relabelled as an exact classical prescription.

Why Overnight Fermented Rice Water Was Removed

The proposed “Prasanna” method—leaving cooked rice water at room temperature for twelve to twenty-four hours and drinking it—was not supported by the cited classical material and introduces a food-safety concern. Cooked rice can contain surviving spores of Bacillus cereus. The longer cooked rice or its starchy water remains at room temperature, the greater the opportunity for bacterial multiplication and toxin formation. Sourness, effervescence, smell, or appearance cannot verify that an uncontrolled household ferment is microbiologically safe.

The claimed 2020 study reporting improved intestinal-flora diversity and reduced intestinal-permeability markers in adults with irritable bowel syndrome after fermented rice water could not be verified in the named journal and has been removed. Without an identifiable paper, authors, DOI, or trial record, it should not be used to support a therapeutic recommendation.

For related reading on Ayurvedic digestive health, see our post on Ayurvedic digestive health. For culinary fermentation, see our post on Ayurvedic pickling and achar preparations. For information about Triphala, see our Triphala complete guide; Triphala should not be assumed to be a necessary companion to fermented preparations unless a qualified practitioner recommends it.

Fermented Ayurvedic medicines may contain self-generated alcohol and should be taken only in the labelled dose under the guidance of a qualified Ayurvedic physician or other appropriate healthcare professional. Avoid alcohol-containing preparations during pregnancy, with alcohol-related liver disease, before driving, or together with medicines that may interact with alcohol unless a clinician has specifically approved their use. Purchase licensed products, inspect the full ingredient and dosage information, and do not replace prescribed treatment with an uncontrolled home ferment.

Actionable tip: Instead of preparing overnight rice-water “Prasanna,” first identify the exact substance being considered. Is it an ordinary food ferment, a historical madya, or a licensed asava-arishta medicine? For a medicinal product, review the complete label, ingredients, dose, alcohol declaration where provided, contraindications, and current medicines with a qualified practitioner. This follows the classical emphasis on substance, processing, quantity, timing, strength, food, and individual suitability without converting an unverified household experiment into therapy.

Grain Fermentation – Ayurved Healing