ZismanUCThe featured image points to a widespread idea now on the web concerning how cola drinks might promote kidney stone passage. It has been called the ‘Coke Treatment for Kidney Stones.‘ Fluids are valuable for all stone formers, but the suggested usage may not be ideal and this post points out some of the drawbacks.


A few months ago, a delightful 71-year-old woman presented to our clinic for a metabolic evaluation to try to stop her chronic kidney stones. She passed her first kidney stone about 5 years ago. A year later she developed another kidney stone, which required shockwave lithotripsy therapy. Ultimately her stone was analyzed and she was told it was a “calcium stone.” Over the following few years, she continued to pass one stone per year. More recently, the frequency had increased to a few times per year. Frustrated with the frequent stone recurrences, she sought information online regarding potential remedies for recurrent stone disease. On several websites she came across a remedy known as the “Coke treatment,” which was purported to dissolve kidney stones and prevent stone recurrence. She sent in her payment of $39.97 and received a booklet instructing her to do the following:

  • drink 72 ounces of Coca Cola, ideally not diet or caffeine-free, in 15 minutes or as fast as possible
  • steam and puree one-half pound of asparagus and drink immediately
  • repeat as necessary until kidney stone pain is resolved and stones have passed
  • some variations of this treatment that can be found on the web also recommend drinking water for several hours after the treatment

She dutifully followed the instructions provided and found that on the day of her acute pain, her symptoms did, indeed, abate. Unfortunately, over the next year she found the frequency of her stone attacks actually increased – most recently to as often as passing gravel 2 to 3 times weekly (with significant discomfort). To combat this she has been using the “Coke treatment” about 2-3 times weekly over the last year, creating an apparent vicious cycle (more on that later). Finally, her daughter insisted that she see a physician and so she presented to our office, wondering why her treatment hasn’t been effective.


Using the term ‘Coke treatment of kidney stones’ yielded about 108,000 results, and by page 10 the treatment was still prominent. So cola drinks as a treatment is current.

claim in Internet lore is that phosphoric acid, an additive used in dark colas, when consumed in large quantities can facilitate a reaction within the kidney that will dissolve the calcium oxalate or calcium phosphate admixture that is the kidney stone.  One finds variants of this claim in the discussions by patients.

As I pictured this poor older woman chugging a 6-pack of Coke 2-3 times per week with an asparagus chaser, I was curious to determine whether any potential scientific merit to the internet solution exists.

In short, the answer is No.

Allow me take you through some of the details.


Fluids are Useful

I will start with the 72-ounces of Coca Cola that are to be ingested rapidly. Of course, if one is having acute renal colic with a small stone stuck in a tiny structure like the ureter or urethra, drinking over two liter of fluids of any sort is likely to be beneficial in attempting to propel the stone forward and out of the body. But why Coca Cola? Or any cola for that matter? Is there some reason to believe cola drinks have special properties as a stone treatment?

As far as I can tell, no.

Cola Drinks Are Not a Proven Remedy

Phosphoric Acid as a Stone Dissolver

Phosphoric acid, mixed with nitric acid, is used as a cleaner in the beer industry to remove beerstone (calcium oxalate) from beer kegs. It is also used in home cleaning solutions, as an industrial etchant, and as a rust remover. This leads to the false impression that drinking acid phosphates in beverages will create conditions in the kidneys like those in the beer kegs.

In beer kegs, and when you clean your floor with cleaners, high concentrations of a strong acid are applied directly to the unwanted material.

You Can’t Get Phosphoric Acid into the Urine

But when the small quantities of phosphoric acid found in dark colas are ingested, the first thing that will happen is that calcium and magnesium binding will occur in the gastrointestinal tract. By the time the remaining phosphoric acid is absorbed, additional buffering will occur in the blood and bone, so essentially neutral – not acid – phosphate will be delivered to site of the stone. In studies of a neutral phosphate’s effect on crystal inhibition and dissolution, no evidence of crystal dissolution has been noted.

Effects of Cola in People

How about real people, instead of crystals?

Cola Drinks Raise Stone Risk in Urine

Four subjects were asked to drink three quarts (96 oz) of a dark cola over the course of 48 hours. The researchers then compared the amounts of 3 urine constituents that are known to affect the likelihood of stone formation: magnesium (higher levels in the urine are associated with DECREASED likelihood of stone formation), citrate (higher levels are associated with DECREASED likelihood of stone formation) and oxalate (higher levels are associated with INCREASED likelihood of stone formation). In this study, the average 24-hr magnesium excretion decreased by 2.6 mg, the average citrate excretion decreased by 122 mg, and the average oxalate excretion increased by 8.6 mg.  So in fact, in each of the three constituents, the effect of the cola was a worsening of stone risk.

A larger study performed a few years later confirmed these findings, as well as an associated increase in supersaturation for calcium oxalate in a group of 45 subjects.

Cola Drinks Raise Statistical Risk of Stones

In nearly 200,000 individuals who have been followed over time, Ferraro and colleagues analysed the association between consumption of sugar-sweetened colas and kidney stone formation. Subjects consuming the most sugar sweetened colas were 23% more likely to develop a kidney stone than those in the lowest consumption group. In general cola type drinks are exactly the wrong ones for stone prevention.

Cola Drinks May Pose Other Health Hazards

Sugar and Sodium

The suggested amount of regular Coke in the ‘Coke treatment’ has 840 calories, 270 mg of sodium, and 39 grams of sugar. Taking in that many calories from sugar will almost certainly reduce the amount of other nutrients that one is able to eat or drink in a day, while sugar and sodium are both directly linked to higher urine calcium excretion, a key contributor to nephrolithiasis.

Bone Disease

Whether because of substitution for milk-based drinks, or due to the high acidity associated with soft drinks, consumption of increasing quantities of carbonated beverages has been linked to osteoporosis.

Kidney Disease

In addition to the well known association with diabetes and obesity, a recent report has linked higher consumption of dark colas (2 cans or more per day) with risk of chronic kidney disease.


Ancient Beliefs

Asparagus has been cultivated in the Mediterranean region and in Asia for over 2000 years. Egyptians, Greeks, and Romans believed asparagus to have medicinal properties ranging from treating mood disorders to rheumatism, and a 15th century Arabic sex manual entitled “The Perfumed Garden” claimed asparagus has aphrodisiac properties. It is believed by many to have diuretic properties.

Not Our Asparagus

The usual variety of asparagus that we would buy at the store, Asparagus officinales, is a different species than the medicinal Asparagus racemosa, which is commonly grown in Asia. Furthermore, the medicinal use of asparagus typically involves the root, not the shoot that we typically eat. In Germany, for example, asparagus root is approved by an herbal oversight board as a diuretic whereas the shoot is not recommended.

Not Any Asparagus?

How good is the evidence? Despite what the herbal board says, a recent review found no evidence for human use of the asparagus root as a diuretic. And what if it were a potent diuretic, for argument’s sake? It would have to have specific effects in the distal convoluted segment (a particular region of the kidney tubule), like the thiazide diuretics, to have any beneficial effects on stone prevention –and certainly unlikely to be effective in the acute setting.

So What’s the Harm in a Lot of Asparagus? 

Generally, not much. In normal quantities it is  a healthy vegetable loaded with nutrients such as folate, potassium, and vitamin C. For a stone former, however, there may be hidden dangers with a high asparagus intake. Asparagus has a moderate amount of oxalate, and this amount adds up quickly with repeated administrations of such treatments as the ‘Coke treatment.’ Furthermore, vitamin C is also metabolized to oxalate in the body, adding more of the lithogenic substance to the urine. So, as with most things (except water), it seems that moderation is key.


Looking back,our patient appears to have increased her stone attack frequency with the help of the “Coke treatment” from yearly to several times per week. It seems that the remedy was indeed worse than the disease.

During our visit, in preparation for which she performed several 24-hour urine collections, we determined an individualized plan for her kidney stone treatment based on her urine parameters and a thorough history. With a steady increase in her daily fluid intake and the addition of thiazide therapy, at last check she has had no further stone episodes.


On a hot Summer day, a can of Coke can be delightful. As a medical treatment for kidney stones, no cola is as good as plain water. In the very high doses of the ‘Coke treatment’ there is no benefit predicted from what science we have, and no data to show benefit from a clinical trial. In fact, it would be difficult to organize and perform a clinical trial of the ‘Coke treatment’ because of its evident potential for harm. The trial would be unlikely to pass the human subject protection board review.

Don’t do it.

You Might Want to Read:

Kidney Stone Pain

Fluids to Prevent Stones

Citrate to Prevent Stones

What Stones Are

Types of Kidney Stones






  1. Lester

    I have passed a kidney stone every 10 years or so since I was 26. I’m almost 70 now. The last time I had a kidney stone I was away on vacation in the mountains. 200 miles from a VA hospital and I called the nurse and she said to drink a 6 pack of beer and eat a watermelon! Dang! It worked!! shot that 4 mm stone right out in the shower!!

    • Fredric Coe, MD

      Hi Lester, The beer and watermelon would produce quite a high urine flow rate and perhaps that helped. I am glad it worked for you. As a physician I cannot recommend such a treatment, of course. Regards, Fred Coe

  2. Connie Andrew

    Do you have to drink the full 72oz of Coke on an empty stomach that means you can’t have anything to eat ,Paid for the recipe but my daughter got the email so don’t fully understand what to do ,Please help ,

    • Fredric Coe, MD

      Dear Connie, I am responding to both of your questions here. I no not advocate this treatment, and the article by my colleague Dr Zisman is very critical of the underlying lack of scientific support for it. I am sorry you paid for the recipe, as the article would have advised otherwise. On a personal level, I would gladly share with you how to eat the vegetable or drink the coke just as a courtesy but I confess I do not know the details. From all we can tell as scientists there is no basis for doing any of it so I never looked into the issue. Regrets and best wishes, Fred Coe

      • Connie Andrews

        I tried the Coke and asparagus remedy all I got was a very bad stomach and the pain was really severe ,Wished I hadn’t bothered as I think I’m worse than what I was before I started ,It was Wilfs Remedy I tried ,I’ve tried to contact him as he says there will be a full refund if it doesn’t work ,You can’t even get hold of him so I think he’s a con ,Might be wrong but can’t get in touch anyway with him ,

        • Connie andrew

          He should think ashamed of himself he’s just ripped me off with £40 and I am a pensioner ,He won’t even let me go back on the site ,His treatment did nothing but cause me discomfort ,He reckons if it didn’t work you get a full refund ,How can you when you have no one to get hold of or talk to ,He said he doesn’t rip people off as he wouldn’t be able to sleep at nights as he’s four kids ,Well I don’t seem to be bothering him ,He’s a disgrace ,Least he could do was read his bad comments ,But I don’t think this man has a conscious ,

          • Fredric Coe, MD

            Dear Connie, I am not very positive about this treatment, and do not advise it. The price is astounding! Coke and a vegetable should not cost much, and the ‘secret’ recipe is hardly worth anything at all. Fred Coe

          • jeet

            if you paid through clickbank you will get refund through click bank, but apply within 60 days

    • Diane

      Your info is wrong. My boyfriend on Saturday had kidney stone
      He consumed 5 12 oz cans of Coke within 2 hours
      The 6 th can at the 2 hour mark with can of warmed purée asparagus.
      We started recipe at 3:30 pm
      He passed a lg kidney stone at 6:30 into his urinal.
      This is the second time he has used this recipe.
      I was witness to this.
      His doctor also has this recipe Andhis sister used it.
      It works.
      It’s a fact
      I got the picture of the stone.
      I am sure doctors would hate for everyone to know this info.
      It truly works.
      You are dead wrong.
      The Coke recipe works every time!!

      • Fredric Coe, MD

        Hi Diane, Thanks for the comment. Doctors don’t hate these kinds of remedies, the better word is sceptical. I am glad it worked for your boy friend. If you look at the comments, there is a kind of split – some say good, some say no good. As for science, so far, not so good. But I am happy his stone passed, and wish him well. Regards, Fred Coe

  3. Jason

    Putting about two teaspoons of apple cider vinegar in a glass of water and drink twice daily while suffering from the stone worked best for me.


    Worked for me 3 years ago. now I have stones again, however, coca cola creates a more acid environment in your bloos causing you body to rob minerals from your bones . once the threat is over there is no way to put them back.. wonderful world wide attack on the humans…osteoporosis is a money maker. oh … when you counteract with D3, maker sure you use a combo with K2 otherwise the calcium doesn’t get where its needed.
    Dr. Coe… why is it that you are always replying with negative about the effects of this treatment and downplaying those who say it worked for them… worked for me. lasted three years. Seems you are assigned this thread to make sure the people are kept in the dark. regards

    • Fredric Coe, MD

      Hi Steven, This thread began with the article by my colleague Dr Anna Zisman who research through the data concerning the coke treatment and came to the conclusion that there was no reasonable support for using it and, like you, that there was some bone risk. I felt the same, and still do. Many people have written that it helped them, as you have, and I am glad it did. But I have to be fair and say that from an objective point of view – I am a professional scientist and physician – there is no scientific support for it. Regards, Fred Coe

  5. am

    I appreciate this article so much. Im suffering acutely from the same condition and although I hadnt heard of the coke ‘remedy’ I certainly would not have tried it. Just drinking that much coke could send me into a sugar shock of some kind. I have found little online so far in my search, but your suggestion of thiazide diuretics will be something I ask about. Im just surprised the specialist I saw last didnt prescribe anything for me, almost as if he was throwing up his hands saying nothing works. When you try to function with non-stop pain you are willing to try many things.

  6. Tami dayton

    I have had several stones so the remedy drink water don’t work either that’s all I drink and now have the one that I had two years ago that the doctor wouldn’t take out when took the other one out cause it was small and I told her mine don’t pass now it’s big and stuck but now they can make more money that I can’t afford. Do know water don’t work either. I believe my first doctor who told me they r inherited at the age of 16 goings get them no matter what I drink.

  7. Sarah

    I forgot to add on my previous post that she was in intense pain for three days before she did the home remedy. This happened three years ago and she is healthy and has not had any stones since. When someone is in that kind of pain and that long–to this day she said it was worth it.


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