The main chanca piedra trial enrolled 150 patients after lithotripsy. Its headline number is quoted everywhere without the p value of 0.48 that goes with it.
This article reads that study properly, explains what a lower-pole stone is and why it mattered, and puts the herb next to the intervention with far stronger evidence: fluid intake.
Quick Answer: Does Chanca Piedra Help Kidney Stones?
Modestly, and mainly as an adjunct after treatment. In 150 patients following shock wave lithotripsy, the stone-free rate at 180 days was 93.5% with the herb versus 83.3% without, which was not significant at p = 0.48. In the 56 patients with lower caliceal stones it was 93.7% versus 70.8%, p = 0.01.
Key Takeaways
- The trial followed 150 patients after 1 to 3 lithotripsy sessions.
- 78 patients took 2 g of extract daily for at least 3 months.
- Overall stone-free rates were 93.5% and 83.3%, p = 0.48.
- Lower caliceal stones improved 93.7% versus 70.8%, p = 0.01.
- High fluid intake carries a relative risk of 0.40 by comparison.
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What the Study Actually Did
The design matters more than the headline. This was a prospective study in 150 patients with calcium oxalate stones up to 25 mm, all of whom had already been treated with 1 to 3 sessions of extracorporeal shock wave lithotripsy.[1]Can Phyllanthus niruri affect the efficacy of extracorporeal shock wave lithotripsy for renal stones? A randomized, prospective, long-term study — The Journal of Urology View source
- Population: 150 patients, all post-procedure.
- Treatment group: 78 patients on 2 g daily for at least 3 months.
- Control group: 72 patients, no herb.
- Follow-up: Imaging at 30, 60, 90 and 180 days.
Every patient had already had their stones broken up by a machine. That is the context in which the herb was tested, and it is described more fully in our chanca piedra overview.
The Result, With Its P Value
Here is the number that gets quoted, and the number that gets left out. At 180 days the stone-free rate was 93.5% in the herb group and 83.3% in the control group, and the p value for that difference was 0.48.
| Comparison | Herb | Control | p value |
|---|---|---|---|
| All 150 patients | 93.5% | 83.3% | 0.48 |
| Lower caliceal stones, 56 patients | 93.7% | 70.8% | 0.01 |
| Re-treatment required | 39.7% | 43.3% | 0.2 |
| Recorded side effects | None | None | Not applicable |
A p value of 0.48 means the overall difference is consistent with chance. Any page presenting 93.5% versus 83.3% as a proven benefit has removed the most important column in the table.
Anyone still interested after reading that can at least match the studied amount, since our 1000 mg capsules make the 2 g trial dose exactly 2 capsules a day.
Why Lower-Pole Stones Are Different
The genuine finding lives in a subgroup, and it makes anatomical sense, which is why it is worth taking seriously rather than dismissing. Fragments in the lower calyx have to travel upward against gravity to leave the kidney.
- Lower calyx: The dependent part of the collecting system.
- Known problem: Clearance rates there are worse after lithotripsy.
- The finding: 93.7% versus 70.8% in 56 patients, p = 0.01.
- The caveat: A subgroup result needs replication.
That is a reasonable hypothesis for a follow-up trial. It is not a licence to describe the herb as a stone dissolver.
The pooled analysis of the available controlled data reached the same cautious place, from only 2 qualifying studies.[3]Phyllanthus niruri (stone breaker) herbal therapy for kidney stones; a systematic review and meta-analysis of clinical efficacy, and Google Trends analysis of public interest — Canadian Journal of Urology View source
What Chanca Piedra Does Not Do
Three limits deserve stating plainly, because the name creates expectations the evidence cannot meet, and because delay carries real risk.
| Expectation | Reality |
|---|---|
| It dissolves stones already formed | No trial has demonstrated dissolution |
| It replaces lithotripsy or ureteroscopy | It was studied only as an adjunct afterwards |
| It relieves renal colic | Not tested; colic needs proper analgesia and assessment |
| It works in days | Treatment ran at least 3 months, with 180-day follow-up |
Anyone in acute pain needs care rather than a capsule, and the emergency features are listed further down this page. The dosing that matches the trial is covered in the dosage guide.
The Comparison That Matters
Set the herb beside the best-evidenced intervention and the priority becomes obvious. A meta-analysis of 9 studies, including 2 randomised trials with 269 patients and 7 observational studies covering 273,685 people, found that high fluid intake was associated with a relative risk of 0.40 for stone events.[2]Treatment effect, adherence, and safety of high fluid intake for the prevention of incident and recurrent kidney stones: a systematic review and meta-analysis — Journal of Nephrology View source
- Recurrent stones: RR 0.40 in randomised trials, 0.20 in observational data.
- Evidence volume: 9 studies against the herb's 2.
- Adherence: The real problem with fluids, not efficacy.
- Practical order: Fluids first, always.
What that looks like day to day is set out in how to prevent kidney stones.
When to Get Help Immediately
Kidney stones are usually painful rather than dangerous, and a minority are both. These features change the situation entirely and need same-day assessment.
Seek urgent medical care rather than self-treating if you have
- Fever or chills alongside flank pain, which can mean an infected blocked kidney
- Inability to pass urine
- Vomiting that will not settle
- Pain that your usual painkillers do not touch
- A single working kidney, or a transplanted kidney
- Pregnancy with suspected stones
An obstructed and infected kidney can deteriorate within hours. That is the reason no page on this site will ever suggest managing a suspected stone with a supplement alone.
Frequently Asked Questions
Does chanca piedra break up kidney stones? +
No trial has shown dissolution. The main study tested it after shock wave lithotripsy had already broken the stones, and found a stone-free rate of 93.5% versus 83.3%, which was not significant at p = 0.48.
How long does it take for chanca piedra to break kidney stones? +
The question assumes something the research does not support. In the trial, treatment ran for at least 3 months with imaging follow-up at 30, 60, 90 and 180 days, and the benefit that reached significance was in fragment clearance rather than dissolution.
What did the chanca piedra trial actually find? +
In 150 patients after lithotripsy, the overall stone-free rate was 93.5% with the herb versus 83.3% without, p = 0.48. In the subgroup of 56 patients with lower caliceal stones it was 93.7% versus 70.8%, p = 0.01.
Is chanca piedra worth taking after lithotripsy? +
It is the 1 situation the research actually covers, and the effect was clearest for lower-pole stones. Discuss it with your urologist, since it was studied as an adjunct at 2 g daily for at least 3 months.
Can chanca piedra replace surgery? +
No. All 150 patients in the trial had already been treated with lithotripsy, and the herb was added afterwards. Stones needing a procedure need the procedure, and delay risks obstruction and infection.
Does chanca piedra help with the pain of passing a stone? +
It has not been tested for renal colic, which needs proper analgesia and assessment. Pain that your usual painkillers do not control is 1 of the 6 features that warrant urgent care.
What dissolves kidney stones fast? +
Nothing dissolves calcium oxalate stones quickly, and they are roughly 8 in 10 of all stones. Uric acid stones can sometimes be dissolved with urinary alkalinisation, which is a clinician-led treatment rather than a supplement.
Does it work for all types of stones? +
The trial enrolled patients with calcium oxalate stones, so other types were not represented. Roughly 8 in 10 stones are calcium-based, but stone type still determines the right approach.
Should I take it while a stone is passing? +
Speak to a clinician first. Passing a stone is a situation where fluids, analgesia and monitoring matter, and where 2 of the 6 red-flag features can appear quickly if things go wrong.
Is it better than drinking more water? +
No. Pooled data across 9 studies covering more than 273,000 people give high fluid intake a relative risk of 0.40 for stone events, against 2 studies for the herb. Fluids are the first intervention, not the fallback.
How much should I take for stones? +
The trial used 2 g daily, which is 2 capsules of 1000 mg, for at least 3 months. That is the only amount with a study behind it, and it is worth matching rather than guessing.
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