Chanca Piedra

Supplements · Digestive & Metabolic Herbs · Supplement, Typed Supps

An Amazonian herb long used for kidney and gallstones, with small studies showing it changes urine chemistry in a favorable direction — though it’s not proven to dissolve existing stones.

Stage by stage

Intake (Tea, capsule, or extract): Taken orally, typically with food.
Small intestine (Absorbed): Alkaloids and other compounds absorbed alongside digestion.
Bloodstream (Circulates): Carried systemically toward the kidneys.
Kidneys (Urinary chemistry): Small trials show shifts toward less oxalate/uric acid and more citrate/magnesium in urine.

What the evidence supports

Altering urinary chemistry in a stone-preventing direction (lower oxalate/uric acid, higher citrate/magnesium) — limited evidence. A small clinical trial (about 56 kidney-stone patients) found Phyllanthus niruri increased urinary magnesium and potassium and decreased urinary oxalate and uric acid — changes that are theoretically favorable for stone prevention, since citrate and magnesium are recognized natural inhibitors of calcium-oxalate crystallization. But the trial was small and short.
Reducing existing kidney stone size or promoting passage — insufficient evidence. Some small studies report modest reductions in stone burden, including disappearance of small stones in a few participants, but trial quality is low, sample sizes are small, and results haven't been confirmed in larger, rigorous trials. It should not be relied on in place of medical stone management.
Evidence on Lowering blood glucose or blood pressure — limited evidence. Some studies suggest mild blood-sugar and blood-pressure-lowering effects. This is more relevant as a genuine interaction concern for people on diabetes or blood pressure medication than as an established standalone benefit.

Typical dose

Encapsulated extracts commonly provide 400–500mg per dose, taken one to three times daily in studied protocols; traditional tea preparations vary widely

Upper limit: No established UL

Timing

With food to reduce GI upset.

Time to effect

Weeks: The small trial showing urinary chemistry changes measured effects after several weeks of use; there is no reliable timeframe for any effect on existing stone size.

Common myth

“Chanca piedra will dissolve or flush out a kidney stone you already have.” In reality: The clearer clinical signal is a shift in urinary chemistry that theoretically makes new stones less likely to form — evidence that it shrinks or dissolves existing stones is much thinner and comes only from small, low-quality studies.