← The FormularyDigestionTerminalia chebula
Also known as Haritaki, harad, black myrobalan; one of the three fruits in Triphala.Famous in Ayurveda. Trialled mostly on knees.
Haritaki is the best-studied ingredient in this blend and the studies are mostly about the wrong thing. The flagship is a 105-person, 84-day, placebo-controlled trial of a standardised extract, and its subject was knee comfort in overweight adults. It was funded by Natreon, the company that sells the extract, and run by a contract research firm. Worth noting too: the registered primary outcomes on ClinicalTrials.gov were WOMAC and visual analogue scores, while the result usually quoted from the published paper is a modified KOOS global score. The other real trial measured vascular and inflammatory markers in people with type 2 diabetes. There is a double-blind placebo-controlled trial in haemorrhoids. Nobody anywhere has run a trial asking whether haritaki makes a fatty meal sit more comfortably. Dose is the second gap. Those trials used 500 to 1,000 mg a day of a tannin-standardised extract for twelve weeks; in RICH, haritaki shares 300 mg with a second herb, so it is getting somewhere under 300 mg of a blend whose ratio is not printed. It is here for tradition and for completeness. It is the ingredient that makes this a digestive formula rather than a bile formula, and that is a defensible reason. It is not the same thing as evidence.
The dried fruit of Terminalia chebula, a tree of South and Southeast Asia. In Ayurveda it is haritaki, one of the three fruits in Triphala, and it has been used as a bowel-regulating herb for a very long time.
The fruit is unusually rich in hydrolysable tannins: chebulinic acid, chebulagic acid, gallic acid and related ellagitannins. Commercial extracts are graded on them, and the branded extracts used in trials declare chebulinic and chebulagic acid separately on the certificate of analysis. These are astringent polyphenols. They bind proteins, which is why the fruit puckers the mouth, and they are poorly absorbed, so most of an oral dose is expected to reach the colon intact and be metabolised there by gut bacteria. That expectation comes from tannin chemistry in general, not from anyone measuring it for this fruit in a person. The anti-inflammatory and antioxidant work is in cells and animals. Nothing has been demonstrated about what haritaki does to a human digestive tract handling a fatty meal, which is the job it has here.
Studied in humans for joint comfort, vascular markers and oral health. In RICH it sits in the herbal blend as the traditional digestive element, alongside the bile and enzyme components that do the mechanical work.
Anyone who wants the traditional Ayurvedic digestive element sitting alongside the bile and enzymes. Not for anyone taking iron at the same time of day, not for people on blood-glucose-lowering medication without a word to their prescriber, not in pregnancy or breastfeeding, not for anyone avoiding animal-derived ingredients, and not for anyone whose bowels already run loose.
Take RICH with the meal it is meant to accompany. Tannins are gentler on a full stomach than an empty one, and the traditional pattern for bitter astringent herbs is with or just before food. Leave at least two hours between this and any iron supplement. If your stools loosen, that is the expected direction for this herb rather than a sign anything is wrong; if it goes further than mildly, stop.
Most people will notice nothing specific, and nothing is promised. The realistic ceiling is a slightly easier bowel movement over days rather than hours. The joint and vascular findings in the literature used at least twice this amount, as a standardised single-ingredient extract, for twelve weeks, and should not be expected from a share of 300 mg.
Lopez et al. (2017, BMC Complementary and Alternative Medicine 17:475, PMID 28969626) ran a randomised, double-blind, placebo-controlled trial of AyuFlex, a standardised aqueous T. chebula fruit extract: 105 apparently healthy overweight adults aged 35–70 took 250 mg or 500 mg twice daily for 84 days. Against placebo at day 84, modified KOOS global scores differed at P=0.023, knee discomfort with activity at P=0.001, whole-body joint function at P=0.029, and six-minute walk distance at P=0.047. The study was funded by Natreon Inc., the extract's manufacturer, and sponsored by The Center for Applied Health Sciences; the registered primary outcome measures on ClinicalTrials.gov (NCT02589249) were WOMAC and visual analogue scores. Pingali et al. (2020, Phytotherapy Research, doi 10.1002/ptr.6771, PMID 32618037) gave 250 mg or 500 mg twice daily for 12 weeks to 60 people with type 2 diabetes and measured endothelial function, nitric oxide, malondialdehyde, glutathione, hs-CRP, glycosylated haemoglobin and lipids; we cite it only as the basis for the blood-glucose caution, not as a claim of any kind. Andarkhor et al. (2019, European Journal of Integrative Medicine 30:100935) is a double-blind, randomised, placebo-controlled trial of T. chebula in haemorrhoids; we have verified the citation but not its internal figures, and we make no claim from it. What is not supported, and what we do not claim: that T. chebula treats any digestive disorder, improves fat digestion in humans, relieves joint disease, or lowers blood sugar as a therapy. Two claims that circulate widely were removed from this entry because we could not verify them: a 2024 trial of a branded extract reporting gut microbial diversity, Akkermansia and short-chain fatty acid changes in 43 women, and a rat gastric-emptying study often quoted as the prokinetic mechanism. Neither is findable in PubMed or Europe PMC, so neither is used here.
Read the labelThe fruit is dense in hydrolysable tannins, and dietary polyphenols of this kind are well established to reduce the absorption of non-haem iron. Keep it well away from iron tablets and iron-containing multivitamins — at least two hours. Terminalia chebula has been trialled in people with type 2 diabetes with blood glucose markers among the measurements, so if you take glucose-lowering medication treat additive effects as plausible and speak to your prescriber; the standard precaution of stopping herbal supplements about two weeks before scheduled surgery applies. Tannins can provoke nausea on an empty stomach. It is traditionally a bowel-moving herb, so the direction of travel is looser stools, not firmer. Avoid in pregnancy and breastfeeding; the safety data are inadequate. RICH is a gelatin capsule and contains a bovine-derived ingredient, so the product is not vegetarian. Not a treatment for constipation, haemorrhoids, arthritis, diabetes or any digestive condition.
Evidence grades describe how well an ingredient is studied — A well-supported, C emerging — not a promise of results. Educational, not medical advice. Doses are typical ranges; follow the label on the product.