What Is Probiotic Tea? A Guide to Fermented Tea Leaves (Beyond Kombucha)

Awa Bancha · Goishi-cha · Ishizuchi-san Kurocha · Myanmar Lahpet · Yunnan Suancha

Welcome to a tea universe that most people don't reach. It is populated by large, heterogeneous, course leaves and an insane collection of (friendly) microorganisms. Many of these teas are genuinely rare, with sweet and sour tasting notes that are reminiscent of fruit. They are anaerobically fermented teas: fermented in absence  of oxygen by a wild ecosystem of lactic acid bacteria. Some people attribute a long list of heatlh benefits to these leaves; we can safely claim that many of these teas are delicious.  And you're always welcome to our tea bar to try them.

Our team is familiar with five living traditions of anaerobically fermented tea; there are, most likely, several others that we haven't encountered.

In Japan, the island of Shikoku is home to Awa Bancha (阿波晩茶) from Tokushima, Goishi-cha (碁石茶) from Kochi, and Ishizuchi-san Kurocha (石鎚黒茶) from Ehime. Lahpet (လက်ဖက်) is a most interesting pickled tea of Myanmar that is more often eaten than drunk. The (not very creatively named) Suancha (酸茶, 'sour tea') is a specialty of the De’ang and Bulang peoples of western Yunnan. 

It is important to specify: Goishi-cha and Ishizuchi-san Kurocha go through two types of fermentation: an aerobic 'pile' process, similar to that of cooked pu er or Toyama Kurocha, followed by an anaerobic barrel fermentation (akin to that of Awa Bancha).

Fermented Probiotic Loose Leaf Teas

Tea	Region	Leaf type	Fermentation mode	Heritage status
Awa Bancha (阿波晩茶)	Tokushima, Japan (Shikoku)	C. sinensis var. sinensis; yamacha + Yabukita	Single-stage anaerobic (LAB only)	Important Intangible Folk Cultural Property, 2021
Goishi-cha (碁石茶)	&Otoyo;-chō, Kōchi, Japan	C. sinensis var. sinensis; yamacha + Yabukita	Two-stage: aerobic mould → anaerobic LAB	Important Intangible Folk Cultural Property, 2026
Ishizuchi-san Kurocha (石鎚黒茶)	Saijō, Ehime, Japan	C. sinensis var. sinensis	Two-stage: aerobic mould → anaerobic LAB	Important Intangible Folk Cultural Property, 2023
Lahpet (လက်ဖက်)	Shan State, Myanmar	C. sinensis var. assamica (large-leaf)	Single-stage anaerobic (LAB; pits / sealed sacks)	UNESCO ICH submission, 2026
Suancha (酸茶)	Yunnan, PRC (De’ang & Bulang)	C. sinensis var. assamica	Single-stage anaerobic (LAB; bamboo tubes / pits)	PRC ICH VIII-268, 2021; UNESCO 2022 (sub-item)

Table 1. Sources: Japanese Agency for Cultural Affairs national database;^1,16,26 PRC ICH database;⁴³ Mekong Tourism Organisation.⁴²

 

Awa Bancha (阿波晩茶) — Tokushima, Japan

History

Awa Bancha is produced in the mountainous interior of Tokushima Prefecture, in and around Kamikatsu (上勝町), the Naka River valley, and Minami Town. Local lore ties its origin story to the Buddhist monk Kobo Daishi (aka Ku Kai, 空海, 774–835 CE), founder of the Shingon school, who is said to have brought tea seeds back from Tang-dynasty China and introduced the technique of fermenting boiled leaves in wooden vessels. We have found no documents that prove or disprove this story.

We can, however, quote the 1882 Tokushima Prefecture Statistical Table (明治15年 徳島県統計表), which records bancha production at approximately 284 metric tonnes — nearly double that of green tea in the same year. Whereas modern Japanese folks drink predominantly green tea, Tokushima's traditional bancha seems to have been the drink of the people back in the day!

By the early 2000s, Awa Bancha was considered a regional relic, mostly consumed by old folks in the villages. There are, fortunately, many people working to preserve this wonderful tea these days. The Japanese government, in 2021, designated the manufacturing technique as a National Important Intangible Folk Cultural Property (重要無形民俗文化財). Our old friends Ikawa (in Naka) and Kana and Sil (in Kamikatsu) are some of the young folks sharing Awa Bancha with the world.

In Shizuoka, the Tatara family and the Bancha Research Association are working hard to preserve old tea recipes from Japan. Tatara San uses heirloom leaves from Shizuoka to create some really delicious 'Awa Bancha Style' fermented tea.

Geography and process

Awa Bancha's production zones sit within evergreen forests. Tea is usually made in the middle of summer, when heat and humidity feel overwhelming to most modern urban folks. These conditions strongly favour lactic acid bacteria proliferation.

The kill-green step involves boiling the leaves. In Kamikatsu, producers then rub the leaves by hand in a boat-shaped wooden trough called a cha-suri-bune (茶摺り舟). In the Naka valley, a motorised kneading machine handles this step, and boiling often continues for up to twenty minutes over wood-fired cauldrons fed by spring water.

The rubbed leaves are packed into wooden barrels (oke, 桶); some younger producers use food grade plastic tubs. The mass is trampled to expel air, sealed with 'basho' (a type of banana) leaves, weighted with stones, and flooded with the parboiling liquor. No starter culture is added. The bacteria driving fermentation live in the barrel walls themselves, in the leaves, and in the room.⁴ After 10 days to four weeks, the liquid is drained and the leaves are sun-dried for two to three days on straw mats.¹

Microbiology

Since every granny that we know has her own recipe of Awa Bancha, we tend to take most articles as a valid representation of the tea samples in question - but probably not of the whole Awa Bancha universe.  

We found the following interesting: most spontaneous lactic fermentations of plant matter are dominated by Lactiplantibacillus plantarum — a workhorse species found in kimchi and sauerkraut. Awa Bancha (in this article), tends to be rich in Lactiplantibacillus pentosus. Source: Nishioka and colleagues, who found that three of the four samples ielded almost exclusively L. pentosus and one had a mixed community.^3,4 

Why L. pentosus rather than L. plantarum? A 2019 regional comparison by Horie and colleagues pointed to the presence or absence of an aerobic mould phase as the key ecological selector: two-stage teas like Ishizuchi Kurocha, which have a mould phase, are dominated by L. plantarum; single-stage Awa Bancha is dominated by L. pentosus.¹¹

A 2025 study from the same group formalised the mechanism: catechins and lactic acid produced during an aerobic phase jointly select for L. plantarum over L. pentosus — and since Awa Bancha has no aerobic phase, that selection pressure simply doesn’t apply.⁶⁶

The barrel itself matters enormously. Producers’ barrels are demonstrably distinct from one another at the strain level — each barrel is its own microbial terroir, maintained year after year without any starter culture.⁴

Chemistry - Rich in GABA and Lactic Acid

The samples of Awa Bancha tested in the following research contained 0.4–3.8 g lactic acid per 100 g dry leaf (higher values from Naka producers), and GABA ranges from 2.2 to 80.5 mg per 100 g — at the upper end comparable to the highest naturally fermented foods.^3,56 

 

Goishi-cha (碁石茶) — Kochi, Japan

History

Goishi-cha is produced in the mountainous interior of Otoyo (大豊町), Kochi Prefecture. The name comes from the shape of the little 'tea cakes' which resemble the 'stones' (ishi) used in a game of Go.  Locally (and unappealingly) the tea was also known as uma no kuso-cha “horse-dung tea”. What a disservice to this wonderful tea!¹⁶

The oldest surviving text using the two characters 碁石茶 appears in the a regional geographical compendium dated 1746. The tea may go back further still, but we have no data about its shape, flavour or handcrafting process. 

From at least the eighteenth century through the Meiji era, goishi-cha was produced for the salt-barter trade with the Seto Inland Sea islands. Boats from Naoshima and Awaji brought salt up the Yoshino River to Otoyo; and took back goishi-cha. On those salt-producing islands, where fresh water was brackish, goishi-cha became the base forchagayu (茶粥) — a tea-cooked rice porridge whose acidity and lactic character were thought to counteract the saline water.¹⁶ 

At its height — the Taisho era, 1912–1926 — hundreds of farming households participated in production. Like many of Japan's wonderful regional specialties, the  postwar era plunged the production of this tea into sharp decline. The reasons: convergence of rural depopulation, the spread of sencha, and the abandonment of chagayu. Encouragingly, the Goishi-cha Cooperative was founded around 2010, with seventh-generation producer Ogasawara San at its centre. The cooperative loans the Ogasawara family’s century-old barrels and mushiro mats to member producers each season — because those barrels carry the house mould community, the microbial heritage of the tradition.¹⁷ In 2026, goishi-cha was formally designated a National Important Intangible Folk Cultural Property.

The two-stage process

The production season runs June to August, requiring several consecutive sunny days for the final drying. The total process takes about sixty days.

After harvest by sickle — uniquely, both mature and newly grown leaves are taken without discrimination — the branches are steamed for one to two hours in a wooden bucket. This inactivates leaf oxidases, softens cell walls, and produces the mushijiru (蒸し汁) steam condensate that is reserved for the second fermentation stage. The stripped leaves are spread fifty to seventy centimetres deep on mushiro mats on the earthen floor of the muro (室, fermentation room) for seven to ten days. The muro and its mats host indigenous mould communities — principally Aspergillus, Penicillium, and Mucor — that proliferate over the leaves, degrading cell walls, hydrolysing gallate-type catechins to free EGC and gallic acid, and heating the pile internally.^13,23

The mould-covered leaves are then transferred into wooden kioke (木桶) barrels — some over a century old — and the reserved mushijiru is poured over them. A wooden lid is weighted with heavy stones; during fermentation, gas production visibly lifts the lid assembly. In this oxygen-free environment, lactic acid bacteria — predominantly Lactiplantibacillus plantarum — take over.^21,13 After ten to twenty days, the compressed mass is extracted, cut into squares, and sun-dried on mushiro for two to three days.

Microbiology | Chemistry

No surprise! Some Aspergillus (the same family found in Hunan's brick tea) plays an important role in the aerobic fermentation part. The founding systematic study of goishi-cha microbiology (Okada and colleagues, 1996) identified Aspergillus fumigatus-type moulds as numerically dominant in the aerobic phase, with secondary contributions from Penicillium, Mucor, and Scopulariopsis brevicaulis.¹³ Seura and colleagues (2023) summarised the full microbial succession: aerobic moulds release tannase that hydrolyses EGCG and ECG; lactic acid bacteria — chiefly L. plantarum — then dominate the anaerobic phase.²¹

The most chemically distinctive feature of goishi-cha — and of all two-stage anaerobic teas — is pyrogallol. Gallic acid, released during the aerobic mould phase by hydrolysis of galloylated catechins, is decarboxylated by the moulds into pyrogallol. In the KAKEN-funded Kochi University study, pyrogallol reached 178 µg per mL of extract and was estimated to contribute approximately 28% of the tea’s superoxide-anion scavenging activity — a remarkable contribution from a single phenol that is essentially absent in single-stage anaerobic teas.²²

Ishizuchi-san Kurocha (石鎚黒茶) — Ehime, Japan

History

Ishizuchi-san Kurocha is produced on the slopes of Mt. Ishizuchi (石鎚山, 1,982 m) — the highest peak in western Japan and a sacred centre of Shugendo mountain asceticism. Like its Shikoku cousins, it is linked by oral tradition to Kobo Daishi, who is said to have conducted ascetic training on Mt. Ishizuchi after returning from Tang China and transmitted a fermented-tea technique to the local community.²⁵

Production was vigorous through the Edo and Taisho; periods. By the start of Heisei (1989), only one elderly couple remained, and the tea was widely described as maboroshi no o-cha (幻のお茶) — the phantom tea. Revival came in 1996 when Toda Kumi, president of the Satsuki-kai (さつき会) women’s research group in Saijō City, saw the last producer on a local television broadcast and resolved to preserve the technique. With support from the Ehime Prefectural Agricultural Improvement Extension Centre, the Satsuki-kai obtained the production method directly from the last household. Repeated failures with the anaerobic step delayed success until 1998. Production grew from a single household to three groups; in 2015 the Ishizuchi Kurocha Promotion Council was established. On 22 March 2023, the manufacturing technique was formally designated a National Important Intangible Folk Cultural Property — only the second such designation in Ehime in 42 years.^25,26

Process — and the unique hand-rolling step

The production sequence resembles goishi-cha’s two-stage system, but adds a step found in no other Japanese post-fermented tea: hand-rolling between the aerobic and anaerobic phases. After roughly an hour of steaming and approximately a week of aerobic fermentation, the mould-covered leaves are hand-rolled before being repacked for the anaerobic stage. This crushing of the leaf cells accelerates substrate release and fundamentally alters the chemistry of the subsequent fermentation.²⁵

The aerobic phase is dominated by Aspergillus section Nigri — principally A. niger and A. luchuensis.^27,30 After hand-rolling, leaves are repacked into barrels or plastic bags, weighted, and held for approximately two weeks of anaerobic fermentation.

Microbiology

Lactiplantibacillus plantarum dominates the anaerobic phase (80–100% of the lactic community), with Levilactobacillus brevis as the secondary species (0–20%).^28,30 A culture-based study by Yamamoto and colleagues found that yeasts — principally Pichia kudriavzevii and P. manshurica — persist into the anaerobic phase and metabolise lactate as a sole carbon source, suggesting they regulate the intensity of lactic fermentation rather than merely tolerating it.²⁷

We don't have enough data about its chemistry.

 

Myanmar Lahpet (လက်ဖက်)

History

Lahpet is the tea that disrupts every assumption about what tea is for. In most traditions, tea is drunk. Lahpet is primarily eaten. Two forms are recognised: lahpet-so (လက်ဖက်စို, “wet lahpet”), the fermented leaf eaten alone or with condiments; and lahpet thoke (လက်ဖက်သုပ်, “tossed lahpet”), the salad dressed with peanut oil, garlic, lime juice, fried peas, sesame, dried shrimp, and shredded cabbage. Lahpet thoke is ubiquitous in Burmese restaurants and one of the most distinctively Burmese dishes in the world.

No one in our team has yet visited Myanmar nor witnessed the production of this most interesting delicacy.

Microbiology

This seems to be a WILD ecosystem. The most comprehensive microbiological study of lahpet (Bo, Kim and Han, 2020) used culture, PCR-DGGE, and 16S/ITS amplicon sequencing on 14 products from eight Myanmar regions. Lactobacillus spp. and Acetobacter spp. were most abundant by amplicon sequencing; the two dominant cultured LAB were Lactiplantibacillus plantarum and Secundilactobacillus collinoides. LAB viable counts ranged from 4.80 to 7.74 log CFU/g.³⁵ Among yeasts, Pichia manshurica, Candida boidinii, and Cyberlindnera jadinii dominated.³⁵ A 2024 study additionally identified a thermotolerant Cyberlindnera rhodanensis capable of producing extracellular thermostable β-glucosidase.³⁶

Yunnan Suancha (酸茶) — De’ang & Bulang Peoples

History

Suancha (酸茶, “sour tea”) is the anaerobically fermented tea of the De’ang (德昂族) and Bulang (布朗族) peoples of western Yunnan. Their relationship with tea is unlike any other group on earth. The De’ang creation epic Daoguda Lenggele Biao (达古达楞格莱标) narrates that lightning and wind sent 102 tea-leaf spirits down from heaven; most returned, but one youth and one girl remained and became the De’ang ancestors.

Extremely cool fact! Tea is literally the origin of human life in De’ang cosmology — the only ethnic group in China to trace its lineage to the tea plant.^43,45

For years we've looked for this type of tea in Yunnan, in 2025 we received some samples from Fion Wu, one of the most talented tea researchers and teachers that we know. In 2026, we met a fantastic tea grower from Taiwan, who also hancrafts tea in Yunnan. His sour tea is a treat!

Process

Suancha is made from large-leaf var. assamica harvested as one bud plus two to four leaves. After steaming or boiling for kill-green, leaves are kneaded then packed into one of two traditional vessel systems.

The earthen-pit method wraps steamed-and-kneaded leaves in fresh broad-leaf plant material, buries the package in a prepared pit layered with banana leaves, and seals it with earth against air and rainwater.^43,45 The predominant bamboo-tube method packs leaves into large bamboo tubes (da long zhu, 大龙竹), tamps firmly to expel air, seals with fresh banana leaves, and buries the tubes mouth-down in an earthen pit lined with banana leaves. Fermentation runs approximately two months for edible “wet tea” (食用茶) and four to nine months for drinking-grade “dry tea” (饮用茶).⁴³

For drinking-grade tea, the fermented leaves are foot-pounded in a stone mortar, hand-rolled into balls, pressed into flat cakes, and sun-dried; finished cakes are stored in cloth bags or hung above the hearth.^43,52

Microbiology

Suancha is dominated by Lactiplantibacillus plantarum, which surges from near-zero at the raw-leaf stage to 32.7% of the total bacterial community at peak fermentation, followed by Paucilactobacillus vaccinostercus (8.3%), Secundilactobacillus paracollinoides (4.9%), and minor contributions from Pediococcus, Bifidobacterium, and Levilactobacillus brevis.⁴⁷

The yeast community is dominated by Candida metapsilosis (12.9–81.3% of the fungal community across fermentation), Cyberlindnera fabianii, and Debaryomyces hansenii.⁴⁷ The LAB–yeast interaction here is cooperative: Candida metapsilosis consumes residual oxygen and builds the reducing environment that allows Lp. plantarum to dominate. The absence of oxygen prevents Aspergillus growth entirely, which is why suancha never develops the brown theabrownins of shu pu’er.⁴⁷

An early landmark study (Cao and colleagues, 2019) isolated 26 LAB strains from De’ang pickled tea; 24 of 26 were L. plantarum.⁴⁶ Yang and colleagues (2022) sequenced the complete genome of Lp. plantarum ST: a 3,058,984 bp circular chromosome and seven plasmids, encoding 2,945 proteins including 139 cell-wall biosynthesis genes and 84 defence-mechanism genes.⁴⁸ Gallic acid accumulates to 24.26 mg/g after 18 days — dramatically higher than in any unfermented tea.⁵¹

For Geeks Only: Comparative Microbiology

Across all five teas, the dominant fermentation organisms cluster within a small ecological niche defined by tannin tolerance, halotolerance (in lahpet), and acid tolerance.

Tea	Aerobic phase	Anaerobic dominant LAB	Yeasts / fungi	Notes
Awa Bancha	—	L. pentosus (3/4 producers); L. plantarum (1 producer)	Minor	Single-stage; barrel-resident, producer-specific LAB community
Goishi-cha	Aspergillus fumigatus, Penicillium, Mucor, Scopulariopsis brevicaulis	L. plantarum	Yeasts in muro	Two-stage; pyrogallol formation in aerobic phase (178 µg/mL)
Ishizuchi-san Kurocha	Aspergillus section Nigri (A. niger, A. luchuensis)	L. plantarum (80–100%); L. brevis (0–20%)	Pichia kudriavzevii, P. manshurica (persist into anaerobic phase)	Two-stage; unique hand-rolling (jūnen) between phases
Lahpet	—	L. plantarum, Secundilactobacillus collinoides	Pichia manshurica, Candida boidinii, Cyberlindnera jadinii	Single-stage; high tannase activity (23/29 isolates)
Yunnan suancha	—	Lp. plantarum (32.7%), P. vaccinostercus (8.3%)	Candida metapsilosis, Cyberlindnera fabianii, Debaryomyces hansenii	Single-stage; LAB–yeast cooperative oxygen-scavenging succession

Table 2. Sources: Nishioka et al.;^3,4 Okada et al.;¹³ Yamamoto et al.;²⁷ Bo et al.;³⁵ Cao et al.;⁴⁶ Mao et al.⁴⁷

 

References

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