Chanca Piedra / Stonebreaker (Phyllanthus niruri): Traditional Use, Kidney-Stone Research, Preparation & Safety

September 26, 2026

Chanca piedra, or stonebreaker (Phyllanthus niruri), is a small tropical annual herb best known for its long folk-medicine association with kidney and urinary stones. Its Spanish common name literally reflects that reputation. The plant has also been used in South American, Caribbean, Ayurvedic, and other traditional systems for liver, urinary, digestive, metabolic, and infectious complaints.

Botanical Identity & Name Confusion

Botanical name: Phyllanthus niruri L.
Family: Phyllanthaceae in modern classification; many older medical papers place the genus in Euphorbiaceae.
Parts used: commonly the whole aerial herb or whole plant.

Kew Plants of the World Online recognizes P. niruri as an accepted species native to tropical and subtropical America. Commercial “chanca piedra” is not always botanically simple: Phyllanthus amarus, P. urinaria, and other related species may be sold under the same common name in different markets. A reliable product should identify the species rather than relying on “stonebreaker” alone.

Identification

Phyllanthus niruri is a small annual herb with slender stems and many tiny oblong leaves arranged so that the branchlets can resemble compound leaves. Small greenish flowers and tiny round fruits occur beneath the leaf-bearing branchlets. The plant is adapted to warm tropical and subtropical environments.

Traditional Use

Across Latin American folk medicine, P. niruri has been strongly associated with urinary gravel and stones. Species of Phyllanthus also have long traditions in India, China, Southeast Asia, Africa, and South America for concerns involving jaundice, digestion, urinary function, fever, blood sugar, and liver complaints. The breadth of folk use is historically important but should not be interpreted as proof for every proposed indication.

Traditional Preparation

Chanca piedra is commonly prepared as an infusion or decoction of the dried herb. It is also sold as powder, capsules, tinctures, and standardized extracts. Because commercial products may contain different Phyllanthus species, traditional recipes and modern clinical studies cannot automatically be transferred from one product to another.

A prospective human study of kidney-stone patients used 4.5 g of dried P. niruri herb infused in 250 mL boiling water, taken twice daily for 12 weeks. Other studies have used 450 mg capsules three times daily or about 2 g/day of an extract after shock-wave lithotripsy. These are documented research amounts, not one universally proven dose.

Constituents

P. niruri contains lignans, tannins, flavonoids, phenolic acids, terpenoids, alkaloids, coumarins, and other constituents. Phyllanthin and hypophyllanthin are among compounds often discussed in the genus, although chemistry varies by species and preparation.

Kidney-Stone Research

Stonebreaker is one of the better-studied traditional herbs for urinary calculi. Laboratory work suggests that P. niruri may influence calcium oxalate crystal nucleation, growth, aggregation, adhesion to urinary-tract cells, and crystal structure. Animal and human work has also explored effects on ureteral relaxation and urinary chemistry.

A 2020 systematic review and meta-analysis found only two qualifying clinical studies and concluded that the evidence supported a modest reduction in stone size and number, while emphasizing that the clinical evidence remained limited. A 2025 systematic review described mixed but increasingly supportive evidence, particularly as an adjunct around established stone-management approaches.

In a 2018 prospective study of 56 patients with stones smaller than 10 mm, a 12-week infusion regimen was associated with fewer stones per patient and changes in urinary oxalate and uric acid among patients with specific metabolic abnormalities. A randomized earlier study using 450 mg capsules three times daily found no overall difference in most urinary measures, although urinary calcium fell in the subgroup with hypercalciuria. Following shock-wave lithotripsy, a prospective study found improved stone clearance in some patients receiving a P. niruri extract.

Taken together, the research supports continued investigation and provides more substance than folklore alone, but it does not establish chanca piedra as a guaranteed way to dissolve every kidney stone. Stone type, size, location, obstruction, infection, and individual urinary chemistry matter.

Other Research

Research has explored P. niruri and related species for liver protection, blood glucose, uric acid, viral infections, inflammation, antimicrobial effects, and other areas. Much of this work is preclinical, species-dependent, or based on small studies. Claims that chanca piedra cures hepatitis, diabetes, cancer, HIV, or other serious diseases go beyond established human evidence.

Safety

Short-term human kidney-stone studies have generally reported good tolerability and no major changes in routine serum kidney or liver measurements. A 90-day animal toxicology study of whole-plant ethanolic extract found no evidence of hepato-renal toxicity at the tested doses. These findings are reassuring but do not prove that every species, extract, or long-term regimen is risk-free.

Kidney-stone emergencies: an herb should never delay urgent evaluation for fever, inability to urinate, severe persistent pain, vomiting/dehydration, a single functioning kidney, suspected obstruction, or other signs of complicated stone disease.
Blood pressure and glucose: preclinical and limited human literature suggests possible effects on these systems, so concentrated use deserves monitoring when antihypertensive or diabetes medicines are involved.
Diuretic effects: traditional urinary use may overlap with diuretic medicines or other herbs; hydration and electrolyte context matter.
Species substitution: one of the biggest quality concerns is receiving another Phyllanthus species under the same common name.

Pregnancy, Breastfeeding & Children

Reliable pregnancy, breastfeeding, and pediatric safety data for concentrated P. niruri preparations are insufficient. Food-like traditional exposure in a particular culture should not be automatically equated with the safety of concentrated extracts during pregnancy.

Quality, Sourcing & Storage

Look for the full botanical name Phyllanthus niruri on the label. Ideally, suppliers should distinguish it from P. amarus, P. urinaria, and other related plants. Dried herb should be protected from moisture and contamination; extracts should identify concentration and extraction method when possible.

Related Roosters Peacock Herb Guides

Gravel Root (Eutrochium purpureum)
Corn Silk (Zea mays)
Uva Ursi / Bearberry (Arctostaphylos uva-ursi)

References

Last reviewed: September 26, 2026.

Roosters Peacock educational herb reference. Traditional preparation and modern research are shown together while keeping species identity and evidence limits clear.