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Ashwagandha, garcinia and green tea extract: can they injure the liver? | CION Cancer Clinics
Concentrated supplements of ashwagandha, garcinia and green tea extract have been linked with liver injury in published reports. Most people who take them are fine, but nobody can predict who will react, and a liver with cancer or cirrhosis has the least room to recover. This page explains why, the signs to watch for, and how to raise it with your oncologist without feeling judged. At CION Cancer Clinics, our team supports patients and families through symptoms, follow-up and life during and after treatment.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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The short answer
Can ashwagandha, garcinia or green tea extract harm the liver?
Yes, they can. Doctors in several countries have published reports of liver injury in people taking concentrated capsules or powders of ashwagandha, garcinia and green tea extract. Most people who take them come to no harm, but nobody can tell in advance who will react, and a liver that already has cirrhosis or cancer has the least room to recover.
Why these three come up together
They are among the most widely sold supplements in India and abroad. Ashwagandha is taken for stress, sleep and strength. Garcinia is sold for weight loss. Green tea extract appears in weight-loss and "fat burner" products. Each is easy to buy without a prescription, often as part of a mixture, and each is usually thought of as natural and therefore safe.
A cup of tea is not the same as an extract
Ordinary green tea brewed at home is a drink, and it is not the concern here. The reports involve concentrated extracts, where many cups' worth is packed into a capsule. The same is true of ashwagandha and garcinia: the worry is the concentrated product, taken daily, over a long stretch.
This page applies whether your cancer started in the liver or spread there from somewhere else. Either way, the liver is doing work your treatment depends on.
Natural does not mean gentle on the liver. The liver processes almost everything you swallow, plant or pill.How the injury happens
Why would a herbal supplement damage my liver?
There is no single reason. Several things can act together, and you cannot see any of them on the label.
A reaction in the person, not the plant
In most reported cases the liver reacted in a way that could not be predicted. The same product taken by a neighbour caused nothing. This is why "my relative takes it and is fine" offers no protection.
Concentration
Extracts concentrate the active parts of a plant far beyond what you would get from food. The liver has to process all of it, every day.
What else is in the bottle
Supplements are not tested the way medicines are. Products have been found to contain undeclared ingredients, other herbs, or metals. The companion page on heavy metals in some traditional preparations explains that risk.
Mixing with cancer medicines
Many cancer medicines are also broken down by the liver. A supplement can change how much of a medicine stays in the blood, or add to its strain on the liver.
Most at risk
- People with cirrhosis
- People on immunotherapy or targeted therapy
- People taking several products at once
Not sure whether this applies to you?
Ask an oncologist
!
Signs that cannot wait
If you take any supplement and notice yellow eyes or skin, dark urine, pale stools, new itching, or pain under the right ribs, stop the product and see your doctor this week. If yellowing comes with fever, confusion, unusual sleepiness, vomiting blood or black stools, go to hospital today. Take the bottle with you.
If you take one now
What should I do if I am already taking one of these?
Do not panic
Most people taking these products have no liver injury. The aim is to check, not to frighten you or anyone in the family who bought it.
Gather every product
Collect the bottles, packets and powders, including the ones a relative brought from a village vaidya or ordered online. Photograph each label, front and back.
Tell your oncologist at the next visit
Say what you take and how often. Your doctor needs this to read your liver blood tests correctly. The page on telling your oncologist without being judged gives you the words.
Ask whether to pause it
During cancer treatment the usual advice is to pause concentrated supplements unless your team says otherwise. Ask before stopping any prescribed medicine, which is a separate decision.
Let the blood tests guide what comes next
Your team may repeat the liver function tests after a pause. If the numbers settle, that tells everyone something useful.
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Commonly believed
What families often believe about these supplements
"It is herbal, so it cannot hurt the liver."
Plants contain powerful chemicals. Some of the most serious liver injuries doctors see from non-prescription products come from herbal and dietary supplements. Natural and safe are not the same word.
"Ashwagandha will make me strong enough for treatment."
Feeling weak during cancer treatment is real, and wanting to build strength is sensible. The safer routes are enough protein, enough food, gentle activity and treating causes such as a low blood count. Your team can help with each of these.
"Weight-loss capsules will help my fatty liver."
Garcinia and green tea extract are among the products most often linked with liver injury in weight-loss supplements. Steady weight loss through food and activity, guided by your doctor, is what helps a fatty liver.
"If my doctor knew, they would scold me."
Your doctor needs to know so that a raised liver test is not blamed on the cancer or the treatment by mistake. Telling them protects your treatment. It is not a confession.
Being straight with you
What this page cannot tell you
It cannot tell you whether a supplement caused your raised liver test. Many things raise liver tests during cancer care: the tumour, the treatment, a blocked bile duct, an infection or hepatitis. Working out which one it is needs your doctor, your full medicine list and sometimes a pause and a repeat test.
It cannot rate a product
We do not name brands, and we cannot say whether a particular bottle is clean or contaminated. Supplement labels are not checked the way medicine labels are, so the label alone cannot answer that.
Who this does not apply to
If you drink ordinary green tea, use ashwagandha only as a spice or a household remedy now and then, and have a healthy liver, this page is not a reason to worry. It is written for people with liver cancer, cirrhosis or ongoing cancer treatment who take concentrated products regularly. If you want to keep using traditional medicine, the page on taking Ayurveda alongside treatment explains how to raise it with your team.
If you are unsure whether something you take is safe, call the helpline and read out the label. Someone will help you raise it with your oncologist.Questions we are asked
Common questions about these supplements and the liver
Is ashwagandha safe with liver cancer?
Nobody can promise that it is. Liver injury has been reported in people taking ashwagandha supplements, and the risk is hardest to absorb in a liver already affected by cancer or cirrhosis. The safest step is to tell your oncologist you take it and ask whether to pause it during treatment.
Is drinking green tea harmful?
Ordinary brewed green tea as a drink is not the concern on this page. The liver injury reports involve concentrated extracts, usually in capsules sold for weight loss or energy. If you are unsure whether a product is a drink or an extract, show the label to your doctor.
What is garcinia and why is it a concern?
Garcinia is a fruit whose extract is widely sold for weight loss, often mixed with other ingredients. Doctors have reported liver injury in people taking these products. With a damaged liver, a weight-loss supplement adds risk without a proven benefit, so speak to your team before using one.
How would I know if a supplement is affecting my liver?
Often you would not feel anything at first, which is why blood tests matter. Later signs include yellow eyes, dark urine, pale stools, itching and tiredness. Yellowing with fever, confusion or bleeding needs hospital the same day. Mention every supplement whenever your liver tests are checked.
If I stop, will my liver recover?
In many reported cases the liver tests improved after the product was stopped, though not in every case. How well a liver recovers depends on how much healthy liver remains and on everything else happening at the time. Your doctor will follow your blood tests to see which way they move.
Can these supplements interfere with immunotherapy?
Immunotherapy can itself inflame the liver, and so can some supplements. If both are present, it becomes hard to tell which is causing a problem, and treatment may be paused while doctors find out. The page on interactions with cancer medicines explains more.
My mother insists on giving it. What can I say?
Start from what you agree on: you both want her strength back. Suggest bringing the product to the next appointment so the doctor can check it with the liver tests. A doctor's answer often settles a family disagreement more gently than an argument at home.
Can CION check what I am taking?
Your CION oncologist can go through every product with you, look at your liver tests and advise whether to continue or pause. We cannot test the contents of a bottle. Call the helpline if you want to raise it before your next visit.
Your Specialists
Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.
Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- NCCIH — Using Dietary Supplements Wisely
- MedlinePlus — Herbal Medicine
- NCCIH — Ayurvedic Medicine: In Depth
- National Cancer Institute — Complementary and Alternative Medicine (CAM)
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Herb-induced liver injury explainedHow remedies harm the liver, and who is most at riskHow to tell your oncologist without being judgedThe words to use when raising a supplementInteractions between herbs and cancer medicinesWhy mixing can change how treatment worksFatty liver supplementsWhat the evidence shows for weight-loss and liver products
Talk to us
Taking a supplement and not sure it is safe with liver cancer?
Bring the bottle or a photo of the label, and we will help you go through it with your oncologist alongside your liver tests. One helpline serves every CION centre.