Apple Cider Vinegar for Kidney Stones: Does It Work? Evidence & Risks
- Quick answer: No – ACV does not dissolve kidney stones
- Claimed mechanisms (alkalinisation, citrate, dissolution) – why they fail
- What does the scientific evidence say? (Very little)
- Risks of using ACV for kidney stones
- If you still want to try ACV – safe usage guidelines
- Better, proven alternatives to ACV for stone prevention
- Interactive FAQ – 9 common questions
Quick answer: No – ACV does not dissolve kidney stones
Apple cider vinegar (ACV) has become a popular internet remedy for kidney stones. The claim is that its acetic acid content can dissolve calcium oxalate stones or help them pass. This is false. No clinical study has ever shown that ACV dissolves calcium kidney stones. Calcium oxalate stones are insoluble in acetic acid at any concentration safe for human consumption. While ACV is safe in small amounts as a food ingredient, it is not a treatment for kidney stones. Relying on ACV instead of medical care can lead to delayed treatment, kidney damage, and serious complications.
Claimed mechanisms (alkalinisation, citrate, dissolution) – why they fail
Proponents of ACV for kidney stones often cite several mechanisms. Here is the reality:
- Dissolving calcium stones: Calcium oxalate is insoluble in weak acids like acetic acid. Even concentrated acetic acid (much stronger than ACV) does not dissolve stones in vitro within reasonable time. This is a chemical fact.
- Alkalinising urine: ACV is acidic (pH ~2-3). When metabolised, it may have a mild alkalinising effect (like citrate), but the effect is weak and inconsistent. Lemon juice (citrate) is far more effective.
- Increasing citrate: ACV contains negligible citrate. Lemon juice contains high citrate. If you want citrate, drink lemon water.
- Breaking down stones: Some claim ACV “softens” stones. No evidence. Stones are hard mineral deposits, not organic matter that can be softened.
At Vivekananda Hospital, we have seen patients who drank ACV for weeks while their 8mm stone grew larger or caused hydronephrosis. Do not fall for this myth.
What does the scientific evidence say? (Very little)
A thorough review of medical literature reveals:
- No randomised controlled trials of ACV for kidney stone passage or dissolution.
- A single small 2016 study (n=40) found that ACV (30ml daily) combined with standard medical therapy slightly increased urine citrate and decreased urine calcium – but did not improve stone passage rates or dissolution. The study was not blinded and had high bias.
- No human study has shown ACV dissolves existing stones.
- Case reports exist of patients who developed oesophageal burns, low potassium (hypokalaemia), and tooth erosion from excessive ACV use.
The evidence for ACV is anecdotal and likely explained by the placebo effect or spontaneous stone passage (which occurs in up to 50% of small stones anyway).
Risks of using ACV for kidney stones
• Delayed medical treatment: The biggest risk. A stone that needs surgery may cause irreversible kidney damage.
• Tooth enamel erosion: ACV is highly acidic. Drinking undiluted ACV can erode enamel.
• Oesophageal burns: Concentrated ACV can cause chemical burns to the throat and oesophagus.
• Low potassium (hypokalaemia): Large amounts of ACV can lower potassium levels, dangerous for heart rhythm.
• Drug interactions: ACV may interact with diuretics, insulin, and digoxin.
• Nausea and vomiting: Common with high doses.
If you have a kidney stone >5mm, do not try ACV. See a urologist.
If you still want to try ACV – safe usage guidelines
We do not recommend ACV for kidney stones, but if you choose to use it for general health (not stone treatment), follow these safety rules:
- Dilute it: Mix 1-2 tablespoons (15-30ml) of ACV in at least 250ml of water. Never drink undiluted.
- Use a straw: To protect tooth enamel.
- Rinse mouth after drinking: With plain water.
- Limit to once daily: Do not exceed 30ml per day.
- Do not use if: You have chronic kidney disease, diabetes, low potassium, or take diuretics/insulin.
- Never use as a substitute for medical treatment: If you have a stone >5mm, pain, fever, or hydronephrosis, go to a doctor.
Better, proven alternatives to ACV for stone prevention
If you want to prevent kidney stones naturally, these interventions have strong evidence:
- Lemon water: 60-120ml (2-4 tbsp) of fresh lemon juice in water daily. High in citrate, low in oxalate. Proven to reduce stone recurrence.
- High water intake: 2.5-3 litres daily. The single most effective prevention.
- Low sodium diet: Reduces urinary calcium excretion.
- Normal calcium intake: Do not restrict dairy – it binds oxalate.
- Limit high‑oxalate foods: Spinach, nuts, beets, chocolate, tea.
- Potassium citrate (prescription): For recurrent stone formers with hypocitraturia.
At Vivekananda Hospital, we recommend lemon water over ACV – it is safer, cheaper, and evidence‑based.
Interactive FAQ – Apple cider vinegar and kidney stones
No. No scientific evidence supports this. A 6mm stone has a low chance of passing spontaneously and often requires URS. Do not rely on ACV – you risk kidney damage.
We do not recommend ACV for stones. If you insist, a safe amount is 1-2 tablespoons (15-30ml) diluted in a large glass of water once daily. Never exceed this. But again, it will not dissolve or pass a stone.
In small amounts, ACV is safe for people with normal kidney function. In large amounts, it can cause low potassium, which is dangerous. People with chronic kidney disease should avoid ACV due to risk of electrolyte imbalance.
No. ACV has no analgesic properties. For renal colic, use NSAIDs (ibuprofen) or see a doctor. Do not rely on ACV for pain relief.
Mildly and inconsistently. Citrate from lemons is much more effective at raising urine pH and inhibiting stones. ACV is not a reliable alkaliniser.
There is no known interaction, but we do not recommend combining them because ACV has no proven benefit. Stick to tamsulosin and hydration.
No evidence. Proven prevention includes hydration, low sodium, normal calcium, and lemon water. ACV is not a substitute.
Tooth erosion, throat irritation, nausea, low potassium, and potential drug interactions. Always dilute and use a straw.
No. Urology guidelines (EAU, AUA) do not mention ACV for kidney stones. Lemon water is the only home remedy with supporting evidence.
Disclaimer: Apple cider vinegar is not a treatment for kidney stones. If you have a stone >5mm, pain, fever, or hydronephrosis, seek immediate urological care at Vivekananda Hospital. Do not delay proven medical treatment.