How does Terminalia catappa work to protect the liver?

Terminalia catappa exerts hepatoprotective effects primarily through its high concentration of hydrolyzable tannins, such as punicalagin, gallic acid, and ellagic acid. These compounds function as potent antioxidants, scavenging free radicals and reducing oxidative stress in liver tissues. Evidence suggests these constituents may stabilize cell membranes and inhibit lipid peroxidation, thereby preventing liver damage, though human clinical trials are limited (Evidence Level C).

Can I take Terminalia catappa if I am pregnant?

No, Terminalia catappa is considered unsafe during pregnancy. The plant contains high levels of tannins and other constituents that may stimulate uterine contractions or harm fetal development. Traditional use profiles strongly advise against using this herb while pregnant or breastfeeding. Women who are pregnant should seek alternative treatments for conditions like diarrhea or wound healing to ensure safety for both mother and child (Evidence Level C/D).

What is the recommended dosage for Terminalia catampa leaf tea?

The standard adult dosage for Terminalia catappa is 5 to 10 grams of dried leaves prepared as a tea, taken twice daily. To prepare, steep the dried leaves in hot water for 10 to 15 minutes to extract the active compounds. This dosage is based on traditional use and pharmacological studies, though standardized clinical guidelines are lacking. Users should start with the lower end of the range to assess tolerance (Evidence Level C/Traditional).

Does Terminalia catappa interact with prescription medications?

Terminalia catappa may interact with medications due to its high tannin content. Tannins can bind to alkaloids and other drugs in the digestive tract, potentially reducing their absorption and efficacy. This includes antidiabetic drugs and anticoagulants. Additionally, because it affects liver enzymes, it may alter the metabolism of pharmaceuticals processed by the liver. Patients taking prescription medications should consult a healthcare provider before use (Evidence Level C/Traditional).

What are the side effects of taking Terminalia catappa?

Common side effects of Terminalia catappa are primarily related to its high tannin content, which can cause gastrointestinal distress. Users may experience constipation, nausea, or stomach upset, particularly when consumed in high doses or over prolonged periods. In individuals with pre-existing liver conditions, excessive tannin intake could potentially exacerbate issues despite the herb's traditional use for liver ailments. Monitoring digestive tolerance is recommended (Evidence Level C/Traditional).

Terminalia catappa (Terminalia catappa)

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Terminalia catappa, known as tropical almond, is a multipurpose tree with documented nutritional value and various pharmacological benefits, including antioxidant and antidiabetic activities [PMID:39844979, PMID:26392705].

Background

Terminalia catappa L. (family Combretaceae) is a globally distributed, salinity-tolerant nut-yielding tree used for avenue planting, agroforestry, and as a source of small timber [PMID:39844979, PMID:41599698].

Traditional uses

It is used in ethnopharmacological applications as a heart stimulator, anti-diarrhoeal, bactericidal, anti-parasitic, and anti-stress agent, and to treat angina pectoris, asthma attacks, and bronchitis [PMID:41599698]. Leaves are used for hypertension, diabetes, cough, and jaundice, while the bark is used for diarrhea, dysentery, and abscesses [PMID:38465010].

Active compounds

Key phytoconstituents include phenols, flavonoids, carotenoids [PMID:26392705], alkaloids, tannins, steroids, cardiac glycosides [PMID:38566161], and saponins and terpenoids [PMID:28969774]. Specific identified compounds in leaf extracts include gallic acid, orientin, vitexin, ellagic acid [PMID:41002978], and α-punicalagin [PMID:39252640]. Fruits contain betalains (betacyanin and betaxanthin) [PMID:41956050].

Mechanism of action

Proposed mechanisms for antidiabetic activity include reduction of oxidative stress, inflammation, angiogenesis, and lipid profile correction [PMID:28000229]. In C. elegans, leaf extract improves lipid metabolism and antioxidant activity via the AMPK signaling pathway [PMID:38275634]. In melanoma cells, it inhibits metastasis by downregulating the p-Src and β-catenin pathway [PMID:36238547]. Antihypertensive effects are mediated via modulation of angiotensin-1-converting enzyme (ACE) activity and the H2S/NO/cGMP signaling pathway [PMID:37002876].

Clinical evidence

Evidence DDiabetes/Hyperglycemia

Leaf extracts significantly reduced blood glucose, glycosylated hemoglobin, and increased insulin levels in STZ-treated rats [PMID:31303829, PMID:39827649].

Evidence DDiabetic Retinopathy

Hydroalcoholic fruit extract reversed streptozotocin-induced diabetic retinopathy in rats [PMID:33121423].

Evidence DObesity/Hyperlipidemia

Leaf extract reduced liver and adipose lipid accumulation and inflammation in HFD-induced obese mice [PMID:41002978]. Fruit extracts showed anti-atherosclerotic and antihyperlipidemic roles in rat models [PMID:37810701].

Evidence DHypertension

Fruit-supplemented diets lowered blood pressure and modulated ACE and arginase activity in L-NAME-induced hypertensive rats [PMID:37002876].

Evidence DMelanoma

Leaf extracts inhibited the migration and invasion of A2058 and A375 melanoma cells in vitro [PMID:36238547].

Evidence B

Safety & adverse effects

A toxicological evaluation of aqueous leaf extract was conducted in pregnant rats [PMID:38465010]. Leaf extract showed no cytotoxicity in RAW 264.7 mouse macrophages [PMID:39252640].

Pregnancy & lactation

A study was performed to evaluate the toxicological profiles of aqueous leaf extract in pregnant rats [PMID:38465010].

Evidence summary

The majority of evidence is based on in vitro studies and animal models (rats, mice, C. elegans), with one controlled clinical trial in lambs. There is a lack of human clinical trial data.

PubMed sources

1.PMID: 39844979 (2025) — Tropical almond (Terminalia catappa): A holistic review. · Heliyon
2.PMID: 26392705 (2015) — An updated review of Terminalia catappa. · Pharmacognosy reviews
3.PMID: 41599698 (2026) — Tropical Almond Tree (Terminalia catappa L.): A Comprehensive Review of the Phytochemical Composition, Bioactivities and Economic Potential. · Pharmaceuticals (Basel, Switzerland)
4.PMID: 38275634 (2023) — Indian Almond (Terminalia catappa Linn.) Leaf Extract Extends Lifespan by Improving Lipid Metabolism and Antioxidant Activity Dependent on AMPK Signaling Pathway in Caenorhabditis elegans under High-Glucose-Diet Conditions. · Antioxidants (Basel, Switzerland)
5.PMID: 38628750 (2024)

Terminalia catappa

Sources & Citations