Gokhru

Gokhru (Tribulus terrestris L.): A Comprehensive Reference

1. Identity, Nomenclature, and Botanical Description

Names and Taxonomy

Gokhru (also spelled Gokharu, Gokshur) is a common name for Tribulus terrestris L., a member of the family Zygophyllaceae, which has been used for a long time in both the Indian and Chinese systems of medicine for the treatment of various kinds of diseases. The herb is known by a considerable number of regional and vernacular names. In Sanskrit-derived Ayurvedic terminology, the plant is called Gokshura — a compound word with an etymological meaning related to "cow's hoof," reflecting the shape of the plant's spiny fruit. Gokshura has been cited in classical Ayurvedic texts such as the Charaka Samhita and Sushruta Samhita under the name Gokshura (literally "cow's hoof"). Other English-language common names include puncture vine, small caltrops, goat's head, and devil's thorns. In Unani medicine the herb is referred to as Gokhru, reflecting its Persian-Arabic heritage.

The "Chota" and "Bada" Gokhru Distinction

In Ayurveda, T. terrestris is known as laghu (chota) gokshuru and Pedalium murex is known as brihat (bada) gokshuru. The fruits of T. terrestris are slightly astringent in taste, while the fruits of P. murex are somewhat sweeter in taste. Bada Gokhru is completely different from Tribulus terrestris Linn., which is known as Gokshura or Chota Gokhru. The fruits of T. terrestris are considered the genuine source of the drug Gokshura. In classical texts the fruits of Brihat Gokhru are mentioned as a substitute, but in practice it is considered an adulterant of Chota Gokhru. The present article focuses primarily on Tribulus terrestris, the more extensively researched and commercially dominant form.

Morphology and Distribution

Physically, T. terrestris is a creeping herb with multiple prostrate stems that can reach up to 60 cm. Leaves are opposite and pinnate with 4–8 pairs of oblong leaflets. Bright yellow flowers (~1–2 cm across) give way to hard, spiny burs that cling to clothing or animal fur. It thrives in arid, sandy soils and along roadsides. The plant is generally found across South Africa, Australia, Europe, and India.

Plant Parts Used

The fruit, leaves, stem, and root of the plant are used medicinally. In Ayurveda, the dried ripe fruits (Gokshura) are most prized, though roots and leaves also appear in traditional decoctions.

Common Forms and Preparations

Gokhru is commercially and traditionally available in several forms:

• Powdered whole fruit (churna): The most traditional Ayurvedic preparation, prepared from dried, ground fruits.
• Standardized dry extract: Commercially produced extracts standardized to a percentage of steroidal saponins (commonly 40–45% saponins by dry weight), used in clinical research. Fruits are used to prepare the dry extract (typically via alcohol/water extraction), and the steroid saponin concentration has been determined to be a minimum of 40% of the dry matter in some commercial preparations.
• Tablets and capsules: Encapsulated or compressed extracts or powders, widely sold as sports and sexual health supplements.
• Aqueous decoctions: Prepared by boiling the fruit in water, used in both Ayurvedic and Unani traditions.

2. Traditional and Historical Use

Ayurveda (India)

T. terrestris is commonly known as Chota Gokhru in Indian culture and has been used in the Indian medicinal system for approximately 5,000 years. Classical references appear across the Charaka Samhita, Sushruta Samhita, and Bhavaprakasha Nighantu. Traditionally, it has been used in Ayurveda from ancient times to boost hormonal production in both men and women. In Ayurvedic pharmacology, the plant's classical actions (karma) include: Brumhana (nourishing), Vatanut (pacifies Vata-dosha), Vrusya (aphrodisiac), Ashmarihara (removes urinary stone), and Vastishodhana (cures bladder ailments).

Classical Ayurvedic analysis finds that Gokshura overcomes diseases of the Mutravaha srotasa (urinary tract system) and other body systems. Various simple and compound preparations were used as analgesic, diuretic, anti-inflammatory, aphrodisiac, and rejuvenator. Over centuries, the perception of Tribulus terrestris evolved; initially a specialist herb for urologic complaints, by medieval times it featured in pan-Indian rasayana (rejuvenation) regimens for enhancing virility and longevity.

Traditional Chinese Medicine (TCM)

In the traditional Chinese medicinal system, the fruit part of the plant has been used to treat sexual problems, eye problems, edema, abdominal distension, and leucorrhoea. Furthermore, the roots and fruit part of the plant have been used for the treatment of diseases such as impotency, premature ejaculation, menorrhagia, piles, renal and vesical calculi, rheumatism, headaches, and dizziness. Chinese traditional medicine specifically uses T. terrestris to improve visual acuity and as an anticonvulsant.

Unani and Iranian Traditions

In Traditional Iranian medicine — where the plant is called Khara — it was prescribed for bladder stones and urinary channel disorders. In the Unani system practiced across South Asia and the Middle East, the herb has similarly been employed for urinary and reproductive complaints. The fruits and roots of T. terrestris have been used as folk medicine for thousands of years in China, India, Sudan, and Pakistan.

Other Traditions

In ancient medicine across diverse cultures, extracts of the aerial parts and fruits have been used for diuretic, tonic, and aphrodisiac properties. In ancient times in Indian Ayurveda, it was used to treat conditions requiring diuretic, antiseptic, aphrodisiac, and anti-inflammatory interventions.

3. Key Phytochemical Constituents

Overview of Chemical Classes

Fruits of Tribulus terrestris contain a variety of chemical constituents which are medicinally important, such as flavonoids, flavonol glycosides, steroidal saponins, steroidal glycosides, furostanol saponins, furosteroidal saponins, furostanol glycosides, sapogenins, and alkaloids. Other reported chemical classes include amides, fatty acids, alkaloids, derivatives of cinnamic acid, and phytosterols.

Steroidal Saponins (Primary Active Class)

Spirostanol and furostanol saponins are considered the most characteristic chemicals in T. terrestris. To date, 108 kinds of steroidal saponins have been isolated from the plant — among them, 58 kinds of spirostane saponins and 50 kinds of furostane saponins. The steroidal saponins, such as protodioscin and protogracillin, are thought to confer T. terrestris its unique biological activities.

Phytochemical studies have shown great disparities in the content of active substances, in particular the concentrations of furostanol and spirostanol saponosides, considered to be the predominant active ingredients. Studies have revealed that the composition is strictly linked with the origin of the plant, and hence with climatic conditions; geographical regions significantly influence the composition. As a notable example, research indicates that prototribestin was exclusively detected in samples collected from Bulgaria, Turkey, Greece, Macedonia, Iran, and Serbia; conversely, no prototribestin was found in samples obtained from Vietnam and India.

Flavonoids

Credible phytochemical analyses identify, in addition to steroidal saponins, flavonoids such as kaempferol and quercetin derivatives as principal active constituents. The presence of saponins and flavonoids in Gokhru extracts has been linked to significant antioxidant activity, including reduction of hydroperoxide formation.

Alkaloids

Alkaloids including tribulosin and terrestrinin are also identified among the principal constituents. Many other compounds with a variety of biological properties and chemical structures have been identified from T. terrestris, including phytosterols, phenolic compounds, tannins, terpenoids, amide derivatives, amino acids, and proteins.

4. Established and Proposed Mechanisms of Action

Saponins and Testosterone / Sex Hormone Pathways

Protodioscin, isolated from T. terrestris, is one of the most active compounds considered capable of inducing an increase in testosterone production. Protodioscin in particular is believed to increase the conversion of testosterone to dihydrotestosterone, which promotes red blood cell production and muscle development. Other proposed mechanisms by which T. terrestris may increase testosterone levels include increasing levels of dehydroepiandrosterone (DHEA) molecules (a precursor of testosterone) and suppressing aromatase to prevent estrogen synthesis. These mechanisms have been proposed on the basis of animal and in vitro studies; human clinical evidence for meaningful testosterone elevation is, as detailed below, weak.

Antiurolithic Mechanisms

The aqueous extract of T. terrestris fruits and its fractions have been studied for antiurolithiatic potential. The inhibitory potency of the plant was tested on the nucleation and growth of the most commonly occurring kidney stone type (calcium oxalate monohydrate). Results showed that the bioactive n-butanol fraction, due to higher contents of quercetin, diosgenin, and tannic acid, has a protective capacity rather than a curative property against urolithiasis.

Anti-inflammatory and Immunomodulatory

Saponins have several important biological functions; they have been demonstrated to possess anti-inflammatory effects through the activation of macrophages and other immune cells, thereby modulating the immune system.

Hypolipidemic Mechanisms

Hypolipidemic activity may be due to the presence of phenolic compounds leading to increased lipoprotein lipases in the muscles and decreased activity in adipose tissues, indicating that plasma triglycerides are utilized for energy production by the muscle rather than stored as fat.

Antidiabetic Mechanisms

The saponins, alkaloids, and polyphenolic substances in Tribulus terrestris may block certain digestive enzymes that break down carbohydrates. In vitro work has also identified alpha-glucosidase inhibitory activity that may contribute to glycemic control.

5. Scientific Evidence by Area of Use

5.1 Male Sexual Function and Testosterone

This is the most commercially promoted use of gokhru, and accordingly it has attracted the most clinical research attention. The overall picture is one of mixed results and generally low-quality evidence.

A 2025 systematic review published in Nutrients (PRISMA-adherent, 10 eligible studies, total n = 483) provides the most current synthesis. After searching 162 records, 10 studies were eligible, comprising 9 clinical trials and 1 quasi-experimental study. The Jadad score revealed low methodological quality for 50% of the studies. The studies involved 15 to 172 participants aged between 16 and 70 years. TT supplementation at doses of 400 to 750 mg/d for 1 to 3 months improved erectile dysfunction in 3 of the 5 studies that assessed this parameter. Eight out of ten studies did not report significant changes in androgen profile following TT supplementation, but subjects in the neutral studies did not have low androgen levels at baseline. The authors concluded that TT supplementation has a low level of evidence regarding its effectiveness in improving erectile function in men with erectile dysfunction, and no robust evidence was found for increasing testosterone levels.

An earlier review (covering studies from 2002–2018) similarly noted that a systematic review by Sanagoo et al. reported improvement of sperm parameters in men with idiopathic infertility following tribulus administration. Overall, it has been found that there are few reliable data on the usefulness of T. terrestris in competitive sport; a TT extract used alone without additional components does not improve androgenic status or physical performance among athletes.

5.2 Female Sexual Dysfunction

A systematic review published on PubMed (2020) examined TT for female sexual dysfunction. Three months of treatment with T. terrestris showed a significant increase in serum testosterone levels of premenopausal women. There was no report of serious adverse events, and none of the studies assessed health-related quality of life. The certainty of the evidence was very low, which means there is very little confidence in the effect estimates, and future studies are likely to change these estimates. More RCTs are needed to support or refute the use of T. terrestris.

5.3 Urolithiasis (Kidney Stones)

The antiurolithiatic use of gokhru is among the oldest in its traditional history and has attracted meaningful research interest. Human clinical data have indicated that T. terrestris extract may be useful in the treatment of urolithiasis; after oral administration of the extract, the levels of mean citrate, oxalate, proteins, and glycosaminoglycan in patients' 24-hour urine samples decreased significantly. A preclinical (animal model) study demonstrated that the preventive and curative urolithiatic efficacy in experimentally induced nephrolithiatic Wistar rats was evaluated following oral administration of statistically optimized aqueous extract; treatment showed augmented renal function, restoration of normal renal architecture, and increase in body weight. Overall, while traditional use and preclinical data are supportive, large, well-controlled human RCTs are lacking in this area.

5.4 Antidiabetic Effects

One small study found lower blood sugar in 98 women with diabetes after they took an extract of Tribulus terrestris. Another study also showed lower glucose levels in 100 people with diabetes who took a Tribulus terrestris preparation. To be sure it is safe, larger studies are required. The totality of human evidence in this area is preliminary and small-scale. Most mechanistic data come from animal or in vitro experiments.

5.5 Lipid-Lowering (Hypolipidemic) Effects

The effect of T. terrestris at 5 mg/kg/day for 8 weeks on the lipid profile and vascular endothelium of the abdominal aorta in New Zealand rabbits fed on a cholesterol-rich diet was studied; it was found that dietary intake of the herb significantly lowered the serum lipid profile, decreased endothelial cellular surface damage as well as ruptures, and partially repaired the endothelial dysfunction resulting from hyperlipidemia. This evidence is animal-based; controlled human clinical trials demonstrating lipid-lowering efficacy are not well established.

5.6 Athletic and Physical Performance

TT is touted as a testosterone booster and remedy for impaired erectile function; therefore, it is targeted at physically active men, including male athletes. Based on the scientific literature describing the results of clinical trials, a review attempted to verify information on marketing TT with particular reference to the needs of athletes. The conclusion of that review was unambiguous: there are few reliable data on the usefulness of TT in competitive sport, and in humans a TT extract used alone without additional components does not improve androgenic status or physical performance among athletes.

5.7 Cardiovascular Effects

T. terrestris is noted in Indian and Chinese traditional medicine literature for the treatment of various diseases, especially ischemic heart diseases. It is also associated with hypoglycemic, hypolipidemic, nephroprotective, aphrodisiac, and immunomodulatory activities, and the major therapeutic values of the extract are attributed to antihypertensive, cardioprotective, and anti-inflammatory activity. Mechanistic and animal data are available, but controlled human evidence for cardiovascular benefit is currently lacking.

5.8 Anti-inflammatory and Antioxidant Effects

T. terrestris has demonstrated hepatoprotective, anti-inflammatory, analgesic, antispasmodic, antibacterial, anthelmintic, larvicidal, and anticariogenic activities in pharmacological studies, many of which are conducted in vitro or in animal models. The main pharmacological research on TT has been focused on sexual disorders, but other important effects have been demonstrated in vitro and in vivo studies, including anti-hyperglycaemic, anti-inflammatory, antioxidant, and antibacterial activities.

5.9 Anticancer Properties

The toxic influence of Tribulus on cancer cells was more pronounced than that on healthy fibroblasts in in vitro studies, suggesting the possibility of selective application of this plant against cells with malignant transformation. This evidence is exclusively preclinical (in vitro); no human clinical data exist to support an anticancer claim for gokhru.

5.10 Skin Diseases

T. terrestris contains various bioactive metabolites including steroidal saponins, flavonoids, and alkaloids. These metabolites exhibit anti-inflammatory, antioxidant, and antibacterial properties and tyrosinase-regulating effects, making T. terrestris a candidate for treating multiple skin disorders. Studies have shown potential efficacy against conditions such as atopic dermatitis, acne, and vitiligo. However, several limitations remain: its precise mechanisms of action in skin diseases are not yet fully elucidated, and there is a lack of high-quality, large-scale clinical trials to conclusively verify its efficacy and safety.

6. Dosage Forms and Doses Reported in Research

Doses reported in published clinical research vary considerably. The following are drawn directly from the published literature and are not recommendations:

• 400–750 mg/day of standardized extract for 1–3 months: the dose range used across studies included in the 2025 systematic review examining erectile function and testosterone in men. TT supplementation at doses of 400 to 750 mg/d for 1 to 3 months was the range employed across the assessed trials.
• Saponin-standardized extracts: The steroid saponin concentration in commercially prepared dry extracts has been determined to be a minimum of 40% of the dry matter.
• Animal toxicity reference point: In mice, the dose corresponding to LD₅₀ was established at 813 mg/kg — this is an animal-derived figure and does not directly translate to human safety thresholds.

7. Body Systems and Health Areas of Association

Based on the totality of traditional use and pharmacological research, gokhru has been associated with the following body systems and health areas:

• Genitourinary system: The dried fruit of the herb is considered effective in most genitourinary tract disorders.
• Male reproductive system: aphrodisiac effects, erectile dysfunction, sperm parameters, testosterone modulation.
• Female reproductive system: sexual dysfunction, hormonal modulation in premenopausal women.
• Urinary tract and kidneys: diuresis, prevention and management of urolithiasis (kidney stones).
• Cardiovascular system: lipid-lowering, antihypertensive, and cardioprotective activities (primarily animal/in vitro evidence).
• Metabolic (endocrine): blood glucose regulation, antidiabetic activity (small human studies, primarily preclinical).
• Immune system: immunomodulatory activities observed in preclinical models.
• Skin: anti-inflammatory, antioxidant, and tyrosinase-regulating effects (preliminary evidence).
• Central nervous system: CNS-related activities have been reported, primarily in preclinical settings.

According to the published evidence, T. terrestris boosts testosterone secretion, regulates blood pressure, and protects the human body against injuries, with the cardiovascular, reproductive, and urinary systems being the most severely impacted.

8. Safety Considerations and Drug Interactions

General Tolerability in Short-Term Use

Transient gastrointestinal problems, including irritation of gastric mucosa and gastric reflux, have been associated with consumption of tribulus. Due to the saponin content of the plant, gastrointestinal disturbances may be seen in sensitive individuals. Excitation, menorrhagia, and insomnia were reported in a clinical study.

Hepatotoxicity

Tribulus terrestris has not been reported to cause serum enzyme elevations in persons taking the herbal extract in all prospective observations, but prospective studies with regular monitoring of liver tests have not been done. Isolated case reports of renal injury with serum aminotransferase elevations have been published but may have represented instances of ischemic or anabolic steroid-induced liver and kidney injury rather than direct hepatotoxicity of the extract. The steroidal saponin diosgenin is thought to be responsible for hepatotoxic effects associated with tribulus in case reports. A published case described a 46-year-old man who took tribulus supplements daily for 2 months who developed severe jaundice; his total bilirubin peaked at 48 mg/dL with concomitant renal dysfunction, and liver biopsy showed features consistent with drug-induced liver injury.

Nephrotoxicity

Toxicological studies, although limited, have highlighted the risk of nephrotoxicity following the administration of TT supplements. In an extensively cited case, a case of T. terrestris-induced hepatotoxicity, nephrotoxicity, and neurotoxicity was reported in an Iranian male patient who used the plant's extract to prevent kidney stone formation. He presented with seizure and very high serum aminotransferases and creatinine after consuming herbal water for 2 days; discontinuation of the herbal remedy resulted in improvement in symptoms and normalization of liver enzymes. Another reported case involved severe hyperbilirubinemia in a healthy 30-year-old male bodybuilder, followed by acute renal failure and bile-containing casts in the tubules, associated with the ingestion of tribulus extract tablets once daily for "a few months."

Animal Toxicity Data

The Tribulus terrestris plant is known to be toxic to grazing animals and can cause distinctive liver injury known as "geeldikkop" or hepatogenous photosensitivity. Symptoms of severe damage to cardiac muscle, liver, and kidney were noted in native goats and sheep when their daily meals contained 80% fresh plants.

Drug Interactions

Its pharmacological activities suggest a potential risk of drug interactions, for example with antihypertensives, diuretics, or anticoagulants such as clopidogrel. Specifically:

• Antihypertensives: Use with antihypertensive drugs may increase the possibility of hypotension.
• Antidiabetics / hypoglycaemic agents: Tribulus can increase the blood sugar-lowering effects of hypoglycaemia drugs. Tribulus may have additive blood sugar-lowering effects when combined with antidiabetics, though clinical relevance is not fully known.
• Clopidogrel: Tribulus may increase the risk of blood clots in combination with clopidogrel; stent thrombosis has been reported in patients following concurrent use.
• Androgen-sensitive conditions: People with androgen-sensitive tumours should avoid using it.
• Rare side effects: Another reported rare side effect is gynaecomastia.

Geographically Variable Composition

A critical consideration in evaluating both efficacy and safety is that the composition of T. terrestris is strictly linked with the origin of the plant and climatic conditions; geographical regions significantly influence the composition of herbal drugs. This means the saponin content — and therefore the pharmacological and toxicological profile — of commercially available gokhru supplements may vary substantially depending on their geographic source.

9. Current State of Evidence: Summary Assessment

The overall evidence base for gokhru/Tribulus terrestris reflects a pattern common to many traditional botanical medicines: rich historical and ethnopharmacological documentation, substantial preclinical (in vitro and animal) research demonstrating multiple bioactivities, and a comparatively thin and methodologically limited human clinical trial literature. Additional studies are needed to determine some of the still unknown molecular mechanisms of action of the therapeutic active compounds found in Tribulus extracts.

• Strongest evidence (but still limited): Some improvement in erectile dysfunction in men (3 of 5 studies in a 2025 systematic review), and some evidence for antiurolithiatic effects from human studies.
• Modest/inconsistent evidence: Female sexual dysfunction and testosterone elevation in women; blood glucose reduction in small diabetic populations.
• Predominantly preclinical evidence: Hypolipidemic, cardioprotective, anti-inflammatory, anticancer, antioxidant, and athletic performance claims.
• No robust evidence: Testosterone elevation in eugonadal (normal testosterone) men; athletic performance enhancement when T. terrestris is used alone.

References

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