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Traditional Chinese medicine

Pu-erh teaCamellia sinensis (post-fermented Yunnan tea)

The aged tea drunk after greasy meals; its trials are of lipids and weight, not digestion: 90 adults with metabolic syndrome, 36 on 333 mg of extract.

Botanical name
Camellia sinensis (post-fermented Yunnan tea)
Part used
leaf, fermented and aged
Also called
pinyin Pu'er cha (普洱茶); Pu'er tea, Puerh, Dark tea, Raw (sheng) and ripened (shou) pu-erh
Used in
Traditional Chinese medicine
Taken for
Indigestion, Bloating
Sold as
loose leaf tea, pressed cake or brick, instant powder, extract capsule

What is meant by pu-erh tea

Pu-erh is tea from the leaves of Camellia sinensis, the same species as black and green tea, that has been through a microbial post-fermentation and aging step. Research papers separate raw and ripened pu-erh as distinct types. It is sold as loose leaf, as pressed cakes and bricks, and as instant powder, and as capsules of water extract.

Its place in a digestive encyclopedia rests on a drinking habit more than a prescription. A university science news page calls it well known that drinking pu-erh after a heavy and greasy meal could help digestion, and a paper has given the tea's lipid-lowering reputation a mechanism in mice. As a beverage it carries caffeine: a laboratory measurement of six tea types found about 13 mg of caffeine in 200 mL of pu-erh infusion, similar to black tea. That caffeine is what links it to the catalog’s tea (caffeine) rules.

In the traditions

Traditional Chinese medicine (about TCM)

Pu-erh is a tea, not a pharmacopoeia drug, and we did not find it in the standard English materia medica sources we read, so we give no nature, flavor or channel classification for it. What the sources do report is a custom: drinking pu-erh after heavy, oily food in order to help digestion, which a Hong Kong university research page describes as well known, without presenting it as a studied or formal Chinese medicine use. These are cultural and traditional statements and not findings about the body.

What the plant contains

Fermented pu-erh holds the pigment theabrownin, which is described as its most abundant pigment, plus gallic acid, polyphenols and caffeine. In mice fed a high-fat diet, theabrownin altered the gut microbiota, suppressed bile-salt-hydrolase-producing microbes, raised conjugated bile acids and cut hepatic cholesterol; the paper reports that it also changed gut microbes in humans. The authors of the Japanese trial below note that their extract has a high gallic acid content and that gallic acid is related to lower visceral fat and cholesterol in animals. These are laboratory and animal findings.

What has been tested in people

We found no human trial of pu-erh for a digestive symptom such as bloating or fullness after a meal. The human trials are for body weight and blood lipids.

In a randomized, double-blind, placebo-controlled study, 90 adults with metabolic syndrome took pu-erh tea extract or placebo capsules for three months. In the extract group the body mass index, waist-hip ratio, fasting and two-hour blood glucose, total cholesterol, triglycerides, LDL cholesterol and apolipoprotein B all fell and HDL rose, with significant differences against both baseline and placebo (P below 0.05 or 0.01); inflammatory markers also changed. The abstract does not give a dose.

In a 12-week, double-blind trial in Japan, 36 pre-obese adults (BMI above 25 and below 30) drank barley tea with or without 333 mg of a black pu-erh water extract before each of three meals. Weight and BMI fell more in the extract group from week 8, visceral fat on CT was lower at 12 weeks, and biochemical parameters did not differ significantly between groups; no subject complained of abdominal distension or other adverse effects.

The mechanism paper reports that theabrownin lowers cholesterol in mice through gut bacteria and bile acids and altered gut microbes in humans too. What has not been tested: pu-erh for bloating, dyspepsia or constipation; ripened against raw tea; and tea made by brewing against extract capsules.

StudyDoseWhat it found
Randomized double-blind placebo-controlled trial, 90 adults with metabolic syndrome PMID 21725873Pu'er tea extract capsules, 3 months (dose not stated in abstract)Lower BMI, waist-hip ratio, glucose, total cholesterol, triglycerides, LDL; higher HDL vs baseline and placebo (P below 0.05 or 0.01)
12-week double-blind trial, 36 pre-obese Japanese adults, black pu-erh water extract vs placebo PMID 21745623333 mg extract before each of 3 daily mealsWeight and BMI lower from week 8; visceral fat area lower at 12 weeks; blood chemistry not different; no abdominal distension reported
Mouse and human gut microbiota study of theabrownin from pu-erh PMID 31672964Laboratory and animal dosesAltered gut microbiota, increased fecal bile acid excretion and lowered hepatic cholesterol in mice
Laboratory measurement of caffeine in six tea infusions including pu-erh PMID 40647065200 mL infusionsPu-erh 13 +/- 2.9 mg caffeine per 200 mL, similar to black tea (14 +/- 1.0 mg); brewing time and tea-bag type changed levels

Doses used in trials and traditional preparations

The metabolic-syndrome trial gave extract capsules for three months without stating the dose in its abstract, and the Japanese trial gave 333 mg of a black pu-erh water extract before each of three daily meals for 12 weeks. As a beverage, the tea is brewed from leaf or from a piece of pressed cake. The caffeine measurement found about 13 mg per 200 mL infusion for pu-erh in that study, with higher amounts after longer brewing in some teas, and a different measurement of the same tea will differ with the leaf, the quantity of leaf, the water temperature and the steeping time. We found no tested dose of brewed pu-erh for a digestive outcome.

Treat these figures as a record of what was studied. Whether any amount of pu-erh tea suits a particular person is a question for a clinician or pharmacist who knows their history.

Safety

Pu-erh is a widely drunk beverage. In the 36-adult trial no one complained of abdominal distension or other adverse effects over 12 weeks and 4 weeks of follow-up. The 90-adult trial abstract does not list adverse events. The safety question specific to the tea is caffeine, at about 13 mg per 200 mL in one study, which matters for people who limit caffeine or take medicines that interact with it. A systematic review of mycotoxins in tea covered black, green, dark, white and pu-erh teas and found black tea the most contaminated type at 89.2% of samples, followed by green at 67.3%, and reported higher contamination in studies from low- and middle-income countries; the abstract gives no pu-erh figure. We found no pregnancy-specific data on the tea or its extracts.

Drug interactions

The documented interaction route is caffeine. Pu-erh contains about 13 mg of caffeine per 200 mL infusion in one laboratory measurement, so it adds to the caffeine from coffee, other tea and caffeinated supplements. Caffeine is metabolized by the liver enzyme CYP1A2, which is why paraxanthine-to-caffeine ratios are used as the probe for that enzyme in human studies, and medicines that inhibit that enzyme can slow caffeine clearance. The page also lists the catalog’s own drug rules for tea caffeine automatically. In the two human trials the extracts did not report drug interactions, but neither trial was designed to look for them.

Prescriptions flagged alongside pu-erh tea

Published interaction references put these medicines next to this herb, and the quiz acts on them; a pharmacist is the person to confirm any of it:

Products in the catalog with pu-erh tea

These catalog entries list pu-erh tea or one of its preparations among their active ingredients. Each page shows the amount on the label, the trials behind it and what buyers report.

Nucific Bio-X4 3.8 out of 5 from 7,236 ratings from Amazon · $1.93 a day Amazing Grass Greens Blend Superfood, The Original 4.7 out of 5 from 6,672 ratings from iHerb · $0.89 a day ActivatedYou Morning Complete 3.9 out of 5 from 1,503 ratings from Trustpilot · $2.08 a day Pique Pu’er Black Tea 4.9 out of 5 from 446 ratings from piquelife.com · $2.79 a day

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Common questions

Does pu-erh help digestion?

It is drunk after greasy meals, and a Hong Kong university page calls the habit well known. We found no human trial of pu-erh for a digestive symptom; the trials we found measured weight and blood lipids.

What did the pu-erh trials find?

In 90 adults with metabolic syndrome, an extract lowered BMI, glucose, total cholesterol, triglycerides and LDL against placebo over three months. In 36 pre-obese adults, 333 mg of extract before each meal lowered weight and visceral fat over 12 weeks without changing blood chemistry.

How much caffeine is in pu-erh?

One laboratory measurement found 13 +/- 2.9 mg per 200 mL infusion, similar to black tea at 14 +/- 1.0 mg. Amounts rise with longer brewing and differ with the leaf and the tea bag or loose leaf.

Is raw pu-erh different from ripened pu-erh?

Research papers treat them as separate types, and animal work compares their polyphenols. The human trials we found did not compare them, so we cannot say whether one does more than the other.

Sources