Subtitle: What really happens when you drink olive oil and citrus juice, and why those green “stones” are not gallstones
Short answer: No. An olive oil “liver flush” does not remove gallstones and does not detox your liver. The green lumps people pass afterward are mostly soap-like clumps formed in the gut from the oil and juice. The flush can also cause real side effects, and for people who already have gallstones it can delay proper care.
What is an olive oil liver flush?
A “liver flush” (also called a liver cleanse, gallbladder flush, or gallbladder cleanse) is a home regimen promoted online and by some alternative practitioners. Versions differ, but most follow the same pattern:
- Fasting or eating very little for most of a day, sometimes with only apple juice, vegetable juice, or herbal tea.
- One or more doses of Epsom salt (magnesium sulfate) dissolved in water, which acts as a strong laxative.
- In the evening, a large drink of olive oil mixed with lemon or grapefruit juice. A common recipe is about 2/3 cup (about 160 mL) of olive oil with 1/3 cup (about 80 mL) of citrus juice. Some versions use much more.
- Lying on your right side overnight, then checking your stool the next morning.
What the flush claims to do
Supporters say the regimen:
- “Softens” and flushes gallstones out of the gallbladder and the bile ducts.
- Clears “stones” or “sludge” from inside the liver.
- Detoxes the liver and improves energy, digestion, and skin.
The proof offered is almost always the same: dozens of soft, green, pea-sized “stones” in the toilet the next morning. That is exactly what researchers have tested.
What really happens: the “stones” are soap
In 2005, The Lancet published a case report titled “Could these be gallstones?” by Christiaan Sies and Jim Brooker. A 40-year-old woman with gallstones confirmed on ultrasound (1–2 mm cholesterol stones) followed a herbalist’s cleanse: juice only until 6 p.m., then about 600 mL (roughly 2.5 cups) of olive oil and 300 mL (about 1.25 cups) of lemon juice over several hours. The next morning she passed many semisolid green “stones” and brought them to the clinic.
Lab testing showed:
- They had no crystal structure, unlike real gallstones.
- They melted into an oily green liquid after about 10 minutes at 104 °F (40 °C), just above body temperature.
- They contained no cholesterol, bilirubin, or calcium, the building blocks of real gallstones.
- About 75% of the material was fatty acids.
The authors concluded that digestive enzymes break olive oil down into fatty acids (mainly oleic acid), which then combine with minerals such as potassium from the lemon juice to form insoluble “soap stones.” They also mixed oleic acid with lemon juice in the lab and produced similar balls. Her real gallstones were still there and had to be removed with surgery. In the authors’ words, the claims that these regimens expel gallstones are “a myth.”
The Mayo Clinic says the same thing: there is no reliable evidence that a gallbladder cleanse prevents or treats gallstones, and what people see in their stool are “globs of oil, juice and other materials.”
What about “detoxing” the liver?
Your liver already filters your blood and processes drugs, alcohol, and waste products every minute of the day. The U.S. National Center for Complementary and Integrative Health (NCCIH) notes there is little compelling research that “detox” programs remove toxins or improve health. Cleveland Clinic also advises that your liver and kidneys do this job without a cleanse.
Risks and side effects
A liver flush is not harmless just because the ingredients are familiar foods.
Digestive symptoms
Mayo Clinic lists nausea, vomiting, diarrhea, and abdominal pain as common during a flush. Drinking a large amount of oil on an empty stomach, plus a laxative, often leads to cramps and urgent, watery stools.
Epsom salt and too much magnesium
Epsom salt is magnesium sulfate. According to the NIH Office of Dietary Supplements, high doses of magnesium from supplements or medicines often cause diarrhea, nausea, and cramping. Very large doses of magnesium-containing laxatives have caused magnesium toxicity, with low blood pressure, vomiting, muscle weakness, breathing problems, irregular heartbeat, and in rare cases death. The risk is much higher if your kidneys do not work normally. Repeated diarrhea can also cause dehydration and electrolyte imbalances.
A gallstone can get stuck
This is the most important risk for people who actually have gallstones. Large amounts of fat make the gallbladder squeeze hard. If a stone moves into a bile duct and lodges there, it can cause a gallbladder attack, a blocked bile duct, infection, or gallstone pancreatitis. The NIDDK explains that gallstones blocking the ducts cause sudden pain in the upper right abdomen and can lead to serious complications that need urgent treatment.
Delaying real care
The biggest hidden harm is false reassurance. Someone with gallbladder pain may see “stones” in the toilet, believe the problem is solved, and skip the ultrasound or treatment they need. That is exactly what happened in the Lancet case: the patient’s real gallstones were untouched.
Who should not try a liver flush
Talk to a doctor first, and in practice avoid it entirely, if you:
- Have known or suspected gallstones, or have had gallbladder pain.
- Have kidney disease, heart rhythm problems, or take diuretics or heart medicines.
- Have diabetes, especially if you use insulin or medicines that can cause low blood sugar during fasting.
- Have liver disease, inflammatory bowel disease, or a history of pancreatitis.
- Are pregnant or breastfeeding, or are a child or teen.
- Have a history of an eating disorder.
What actually supports liver health
The good news is that the things that help your liver are well studied, and none of them require a cleanse.
Lose extra weight gradually
Fatty liver disease (now often called MASLD) is extremely common. The NIDDK says losing at least 3% to 5% of body weight can reduce liver fat, and 7% to 10% may be needed to reduce inflammation and scarring. It also warns that rapid weight loss and malnutrition can make liver disease worse, which is one more reason to skip crash cleanses. A moderate calorie deficit is the safer route.
Limit alcohol
Alcohol is directly toxic to liver cells. If you drink, keep it moderate, and if you already have liver disease, ask your doctor whether you should stop completely.
Eat a Mediterranean-style diet
The American Gastroenterological Association recommends a Mediterranean diet for people with fatty liver: vegetables, fruit, whole grains, legumes, fish, and olive oil, with less red and processed meat and fewer sugary drinks.
Move most days
According to the NIDDK, physical activity helps fatty liver even without weight loss. Combine walking or cardio with some strength training.
Coffee: a promising, but observational, signal
A 2016 meta-analysis in Alimentary Pharmacology & Therapeutics found that each extra two cups of coffee per day was linked to a 44% lower risk of cirrhosis. A 2015 meta-analysis in PLOS One found coffee drinkers were less likely to develop cirrhosis and advanced fibrosis. These are associations, not proof, but plain coffee appears to be a reasonable part of a liver-friendly diet if you tolerate it.
Get vaccinated against hepatitis A and B
Viral hepatitis is a major cause of liver damage. The CDC now recommends hepatitis B vaccination for all adults aged 19 to 59, and for older adults with risk factors, and hepatitis A vaccination for adults at risk or who simply want protection. Ask your doctor or pharmacist about your status.
How olive oil fits into a healthy diet
Olive oil is not the villain here. Extra-virgin olive oil is a cornerstone of the Mediterranean diet and a good replacement for butter and other saturated fats. The problem is the dose and the context: 2/3 cup of olive oil is roughly 1,300 calories in one drink.
For everyday use, about 1 tablespoon (15 mL, roughly 120 calories) per meal is plenty to dress a salad, roast vegetables, or cook lean protein. If your goal is weight loss, which is also the most effective thing you can do for a fatty liver, pair modest amounts of olive oil with enough protein to stay full. Our guide on how much protein to eat to lose weight explains the targets, and our high-protein meal plan for weight loss and 5-day high-protein meal prep plan show how to put it on the plate.
When to see a doctor
Get medical care promptly if you have:
- Pain in the upper right or middle of your abdomen that lasts several hours, especially after fatty meals.
- Pain with fever or chills.
- Yellowing of the skin or eyes (jaundice), dark urine, or pale stools.
- Severe abdominal pain that spreads to your back, or persistent vomiting.
- Dizziness, fainting, muscle weakness, or an irregular heartbeat after taking Epsom salt or laxatives.
Gallstones are easy to confirm with an ultrasound, and there are proven treatments, from watchful waiting to medication or gallbladder removal.
Frequently asked questions
Does an olive oil liver flush remove gallstones?
No. Lab analysis published in The Lancet showed the “stones” passed after a flush contain no cholesterol, bilirubin, or calcium. They are soap-like clumps formed from oil and juice in the gut, and the patient’s real gallstones remained.
Why are the “stones” green?
The color comes from the olive oil and from bile pigments mixing with the fatty clumps as they pass through the intestine. Real gallstones are hard and crystalline and do not melt near body temperature.
Is a liver flush dangerous?
It can be. It often causes nausea, vomiting, diarrhea, and cramps. Epsom salt can cause magnesium overload, especially with kidney problems, and in people with gallstones the fat load may push a stone into a bile duct.
Does drinking olive oil and lemon juice in the morning cleanse the liver?
No. A spoonful of olive oil with lemon is a harmless food, but it does not detox the liver. Your liver handles detoxification on its own; weight loss, limiting alcohol, a balanced diet, and exercise are what keep it healthy.
What is the best natural way to support a fatty liver?
Gradual weight loss of 3% to 10% of body weight, a Mediterranean-style diet, regular physical activity, and limiting alcohol and sugary drinks. Check with your doctor about coffee and hepatitis vaccines.
Medical disclaimer
This article is for general information only and is not medical advice. It does not replace diagnosis or treatment by a qualified health professional. If you have abdominal pain, known gallstones, liver disease, or any other medical condition, talk to your doctor before changing your diet, fasting, or taking laxatives or supplements.
Sources
- Sies CW, Brooker J. Could these be gallstones? The Lancet. 2005;365(9468):1388. https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(05)66373-8/fulltext
- Mayo Clinic. Gallbladder cleanse: A “natural” remedy for gallstones? https://www.mayoclinic.org/diseases-conditions/gallstones/expert-answers/gallbladder-cleanse/faq-20058134
- NCCIH. “Detoxes” and “Cleanses”: What You Need To Know. https://www.nccih.nih.gov/health/detoxes-and-cleanses-what-you-need-to-know
- Cleveland Clinic. Detox or Cleanse? What To Know Before You Start. https://health.clevelandclinic.org/detox-cleanse
- NIH Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals. https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
- NIDDK. Symptoms & Causes of Gallstones. https://www.niddk.nih.gov/health-information/digestive-diseases/gallstones/symptoms-causes
- NIDDK. Treatment for NAFLD & NASH. https://www.niddk.nih.gov/health-information/liver-disease/nafld-nash/treatment
- American Gastroenterological Association. Lifestyle modification using diet and exercise to achieve weight loss in the management of NAFLD. https://gastro.org/clinical-guidance/lifestyle-modification-using-diet-and-exercise-to-achieve-weight-loss-in-the-management-of-nonalcoholic-fatty-liver-disease-nafld/
- Kennedy OJ, et al. Systematic review with meta-analysis: coffee consumption and the risk of cirrhosis. Aliment Pharmacol Ther. 2016;43(5):562-574. https://onlinelibrary.wiley.com/doi/10.1111/apt.13523
- Coffee consumption decreases risks for hepatic fibrosis and cirrhosis: a meta-analysis. PLOS One. 2015. https://pmc.ncbi.nlm.nih.gov/articles/PMC4640566/
- CDC. Updated Recommendation for Universal Hepatitis B Vaccination in Adults Aged 19–59 Years. MMWR. 2024. https://www.cdc.gov/mmwr/volumes/73/wr/mm7348a3.htm
- CDC. Adult Immunization Schedule Notes (hepatitis A and B). https://www.cdc.gov/vaccines/hcp/imz-schedules/adult-notes.html
