Kidney Stones Are Made of Two Things. Your Prescription Is Aimed at One.
The other half, and the plant that's been used on it since before American medicine existed.
You know the size of them.
The community calls them horse pills and nobody who's taken one thinks that's an exaggeration. You've gagged on one in a bathroom that wasn't your own. You take them with food now, because you learned the hard way what happens otherwise, which means meals have to happen at the right times.
You know what the pharmacy counter says every month. You know what it said before insurance stopped covering it and what it's said since.
And you have done it. Three times a day, maybe for years. Anyone who's been prescribed anything three times a day knows that isn't a small thing.
So at every appointment you've asked some version of the same question. Is this working?
Here's the thing almost nobody is told, and it's a two-minute explanation that would have changed how you understood the last several years.
Most kidney stones are calcium and oxalate stuck together. Two ingredients, bound.
Citrate works on the calcium. It binds to it in the urine, so less of it is free to pair with oxalate. That's the mechanism. That's the whole mechanism. It's elegant, it's well-evidenced, and it's exactly why every urologist in the country reaches for it.
It is also, precisely, one thing.
The oxalate side is a separate faucet, and it's still running. Your liver manufactures oxalate internally, every day, as a normal byproduct of your metabolism. It happens whether you had spinach for lunch or a plain chicken breast. Citrate has no reach into that at all — it works on the other ingredient.
And there's a step after both of them. Calcium and oxalate meet in the urine of essentially every person alive. Tiny crystals form constantly, in people who have never had a stone and never will. A crystal on its own is microscopic and it leaves without you ever knowing it existed.
It becomes a stone only if it does two things: binds to other crystals, and grabs hold of the kidney wall long enough to grow.
Citrate reduces how much calcium is available to pair up in the first place. It has nothing to say about what happens to the crystals that form anyway.
None of that means the prescription is the wrong call. It's the right call and it's the most evidence-backed thing there is for this. It means it was one lever, and nobody had fifteen minutes to tell you that.
What potassium citrate does
- Binds calcium in the urine so less is free to pair with oxalate
- Raises urine pH
- Raises urinary citrate, the marker a 24-hour urine test reports back
What it doesn't address
- The oxalate your liver produces on its own, every day
- Whether the crystals that form bind to each other
- What shape those crystals take
- Whether they can grab hold of the kidney wall
The first list is real and it's why the prescription exists. The second list has been running the whole time.
What People Reach For When One Lever Isn't Enough
Drinking more water. Raises urine volume, lowers concentration. It's the single best-evidenced thing you can do and it's free. It doesn't change whether a crystal can grab hold of anything.
Cutting more foods. Lowers the oxalate you take in. It has no reach at all into what your body produces internally, which is why the list never quite ends.
Lemon juice. The idea is sound — citrus contains citrate, and citrate matters. The problem is you're already on prescription citrate, and adding an uncontrolled dose of the same lever isn't a second mechanism. It's more of the first one.
Asking about a higher dose. A conversation worth having with your prescriber, and only with them. But more of one lever is still one lever.
Every one of those is either volume, intake, or more citrate. None of them is aimed at the two things citrate doesn't touch.
"Six years. Three tablets a day. Three hundred a month once insurance stopped.
And if you'd asked me what the pill actually did, I could not have told you. Not once in six years did anyone sit me down for the two minutes it takes to explain it.
I wasn't asking the wrong question because I'm stupid. I was asking it because nobody had given me a better one."
Ray M., 55 — Illinois
What Chanca Piedra Does
There's a small green weed that grows across the Amazon basin. Roadsides, gardens, cracks in pavement. Completely ordinary there, and almost unknown here.
What the research on it looks at is not the calcium side. It's the crystal itself, and whether it can hold on.
It interferes with crystals binding to each other. They still form. They just don't lock together into a mass. A crystal that stays a single crystal leaves the way it does in people who never form stones.
It changes the shape the crystals form in. This is the part most people have never heard. Calcium oxalate crystallizes in two different habits. One of them is jagged and grips kidney tissue. The other is smoother and passes. The laboratory work on chanca piedra shows a shift toward the second one.3
And it reduces how well crystals adhere to the kidney lining. A crystal that can't grab the wall never gets the chance to grow into anything.
That's the step after the one your prescription is aimed at. Not a replacement for it. The next one along.
In one randomized trial in calcium stone formers, participants taking it also saw a 29% reduction in urinary calcium.2
And this is why it's called what it's called.
Chanca is Quechua. Piedra is Spanish. Together, stone breaker.
chanca piedra — “stone breaker”
Not a brand name somebody came up with. That's what people in Peru and Brazil have called that plant for centuries, because that is what they use it for. The name came from the job, four hundred years before anyone ran a study on it.
So why has nobody in your care ever said the words?
It isn't a conspiracy. It's a plant that grows on another continent, used by people who mostly aren't the ones writing American clinical guidelines. Our medicine is world-class at the stone that already exists. It has never been especially interested in what's been simmering on a stove in Brazil.
You've spent years pulling one lever as hard as it goes. Don't now go and buy a different single lever.
Most of what's sold is ground-up whole plant with no standardization. No stated dose, no consistency between batches, and nothing else in the bottle.
Which is the whole reason Stone Clear exists.
The plant is the answer to the piece nothing else was aimed at, so we built the product around it. 500mg of standardized chanca piedra, disclosed on the label, at a dose you can actually check.
Then everything a complete formula should have alongside it — including the citrate.
Six Active Ingredients. One Complete Formula.
The thing most people notice first is that it contains potassium citrate.
The same compound your urologist prescribed. It wasn't left out to make a point about being natural. It's in there because it's correct, and because a complete formula doesn't drop a mechanism that works.
Standardized and disclosed. The crystal side: whether they bind to each other, what shape they form in, and whether they can grab hold.
The calcium side. Citrate binds calcium in the urine so less is free to pair with oxalate. The same mechanism as the prescription, in the morning glass.
Two jobs at once. It carries more citrate into the urine, and magnesium itself binds oxalate. Around 60mg elemental magnesium.
Completes the citrate load and handles the pH side. It also does the flavor work, which matters more than it sounds when something has to be drinkable every morning for a year.
The oxalate faucet. B6 supports the enzyme pathway involved in the oxalate your own body produces — the source no prescription and no food list can reach.
A crystallization inhibitor found naturally in whole grains and beans. Almost nothing on the shelf includes it.
Across the three citrate salts, roughly 15 mEq of alkali citrate in the morning glass.
One stick, eight ounces of water. No gagging in a bathroom that isn't yours.
What the Research Says
Figures are from published studies of individual ingredients, at the doses used in those studies, which differ from the doses in this product. They describe what has been observed for an ingredient in research settings. They are not claims about this product. Individual results vary. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
The First 90 Days
The citrate goes to work the first morning. Urine pH and citrate levels respond within days, not months. There's nothing to feel, because this is chemistry, not caffeine. It's happening whether you notice it or not.
One stick, one glass, and you've stopped deciding about it. The travel pack goes in the bag without a thought. For most people this is the point it moves into the same category as brushing your teeth.
You'd been white-knuckling a gallon a day and falling off by mid-afternoon. Now the morning glass is the anchor and the rest of the day is just drinking. First stretch in years where hydration isn't a running scoreboard in the back of your head.
The quiet one, and the one people notice last. You stop running the calculation every time your back twinges. You stop mapping the drive to the hospital before a road trip. Somebody asks how the stone thing is going and you have to stop and think about it, because you haven't thought about it in weeks.
Timeline reflects experiences some customers have shared — not a guarantee of results, and individual results vary.
The Finish-It Guarantee
Use every stick. Take all 90 days. If it isn't for you, tell us and we'll refund the order in full. No questions, and no need to send anything back.
We'd rather you finished the routine than half-tried it and wondered.
What People Say
"The part that got me was the water. I'd been white-knuckling it and falling off by 3pm every day. Now it's eight ounces in the morning and I stopped keeping score."
Dana P., 47 — Ohio
"Six months in. It sits next to the coffee so I don't forget it, and honestly I don't think about any of this the way I used to. That's what I'd tell somebody."
Ray M., 61 — Arizona
Individual experiences. Results vary.
Common Questions
Should I stop my prescription?
No. Nothing here is a reason to stop, reduce, or change a prescription, and that decision belongs to you and the person who wrote it — not to anything you read online. Prescription citrate is guideline-recommended and it does a real job.
Can I take this alongside it?
Talk to your doctor or pharmacist first. Stone Clear contains citrate salts, so your prescriber is the right person to look at the combined total and tell you what makes sense for you. Bring them the label.
What is Stone Clear?
A daily drink mix for kidney support. Six actives at disclosed doses, aimed at four parts of your urine chemistry. One stick in 8oz of water each morning. It's a dietary supplement, not a medicine, and it's built to sit alongside whatever your doctor already has you doing.
How do I take it?
One stick in a full 8oz glass of water, once a day. Most people do it in the morning. The full glass isn't a suggestion, it's part of how the routine works.
How does it taste?
Citrus-forward and tart, which is what happens when the actives are citrate salts. It was formulated to be something you'll finish every morning rather than brace for.
Can I take it while I'm passing a stone?
If you're in acute pain, see a doctor. Severe pain, fever, vomiting or blood in the urine need medical attention quickly, and no supplement is a substitute for that. Stone Clear is a daily routine built for the days in between.
Is it safe? Side effects?
Common supplement ingredients at everyday doses. The most frequent effect with citrate salts is mild digestive upset, which taking it with food usually settles. If you have kidney disease, are on a potassium-restricted diet, take potassium-sparing diuretics, ACE inhibitors or ARBs, or are pregnant or nursing, check with your doctor first. The potassium content is the specific reason for that — and it's the specific reason to talk to your prescriber if you're already on citrate.
Do I need to know my stone type?
It helps. Most stones are calcium oxalate but not all, and the right approach genuinely differs. If you've never had a stone analyzed or a 24-hour urine done, both are worth asking your doctor about. They'll tell you more about your own chemistry than any product page can.
One Lever Was Never the Whole Machine
The prescription does what it does, and it does it well. It was only ever aimed at one of the two ingredients.
- The plant nobody told you about — chanca piedra 500mg, standardized
- A complete formula — targets four mechanisms behind stone formation, not one
- The same citrate you're already taking, in a glass instead of a horse pill
- B6 and magnesium — aimed at the oxalate faucet nothing else reaches
- 90 days to decide. Use every stick and still get your money back
References
- Nishiura JL, Campos AH, Boim MA, Heilberg IP, Schor N. Phyllanthus niruri normalizes elevated urinary calcium levels in calcium stone forming patients. Urol Res. 2004;32(5):362–366. PMID 15221244
- Barros ME, Schor N, Boim MA. Effects of an aqueous extract from Phyllantus niruri on calcium oxalate crystallization in vitro. Urol Res. 2003;30(6):374–379. PMID 12599017
- Urocit-K (potassium citrate) FDA prescribing information.
- Ortiz-Alvarado O, Miyaoka R, Kriedberg C, et al. Pyridoxine and dietary counseling for the management of idiopathic hyperoxaluria in stone-forming patients. Urology. 2011;77(5):1054–1058. PMID 21334732
- Kidney Stone Pathophysiology, Evaluation and Management: Core Curriculum 2023. Am J Kidney Dis.
THIS IS AN ADVERTORIAL AND NOT A NEWS ARTICLE, BLOG, OR CONSUMER PROTECTION UPDATE. © 2026 Hale / Cornerstone Studio.
This is an advertisement. The information here is not medical advice and is not a substitute for the advice of your doctor. Stone Clear is a dietary supplement intended to sit alongside, not replace, prescribed care. It is not a treatment for kidney stones or any other medical condition, and no claim is made that it prevents, reduces or stops stones.
Do not start, stop, reduce or change any prescription based on anything on this page. Potassium citrate is a prescription medication and decisions about it belong to you and your prescriber. If you are already taking it, speak to your doctor or pharmacist before adding any product containing citrate salts.
Persistent or severe symptoms deserve evaluation. Severe flank or back pain, fever, vomiting or blood in the urine require prompt medical attention. If you form stones repeatedly, ask your doctor about a stone analysis and a 24-hour urine collection.
"Stone breaker" is a traditional common name reflecting long-standing folk use of the plant. It is not a description of what this product does.
Individual experiences vary. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
This site is not part of, or endorsed by, Facebook or Meta Inc.
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