Medical Oncologist
Food and nutrition
Common supplements during chemotherapy
Used as food and ordinary spice, yes. Taken as concentrated capsules, powders or daily doses, each of these needs your oncologist's agreement first. The dose is what turns a household ingredient into something that behaves like a medicine, and these three are the least often disclosed.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
Are turmeric, giloy and ashwagandha safe during chemotherapy?
Used as food and ordinary spice, yes. Taken as concentrated capsules, powders or daily doses, each of these needs your oncologist's agreement first. The dose is what turns a household ingredient into something that behaves like a medicine.
These three are the most widely taken supplements in Indian cancer households, and among the least often disclosed. Nobody is going to be scolded for taking them. What causes harm is the doctor not knowing.
The concern is the liver and the drug levels
Not that a herb will stop chemotherapy working. Several are hard on the liver, which is already carrying the treatment, and several shift the enzymes that break down medicines, leaving more or less drug in your body than intended.
Bring the bottle to the appointment
Names are inconsistent, many products are mixtures, and what is on the front of a pack often differs from the ingredient list. Handing over the packet lets somebody read what is actually in it.
Ask the hospital pharmacist with your medicine list. They answer this faster than anybody and are rarely asked.One by one
What to know about each
- Turmeric in cooking
- Not the issue. Ordinary use in dal, curry, rice and haldi doodh needs no change unless your team says otherwise. Removing familiar food from somebody struggling to eat is a real cost with no benefit.
- Curcumin capsules
- A different thing entirely. Far higher doses, often with black pepper extract added to boost absorption, which also boosts the absorption of other medicines. May affect platelets. Declare it.
- Giloy
- Very widely used for immunity. Cases of liver irritation have been reported with it, and liver figures are already being watched closely during a course. This is one to raise specifically.
- Ashwagandha
- Taken for strength and stress. It has effects on the immune system and on hormones, which makes it a genuine question during cancer treatment rather than a neutral tonic. Ask before continuing.
- Tulsi and green tea extracts
- Leaf in tea is one thing; a concentrated capsule is another. Extracts can affect clotting and drug-metabolising enzymes, so it is the concentrated form that needs asking about.
- Immunity syrups and mixed tonics
- The least predictable category, because they combine several herbs in unstated amounts. Bring the bottle so the ingredient list can be read rather than the brand name discussed.
Not sure whether this applies to you?
Ask an oncologistPractical
How to handle this at home
Four steps, and the first one solves most of it.
Collect everything onto one shelf
Every capsule, powder, syrup and packet in the house, including whatever relatives brought. Photograph each ingredient list. This takes twenty minutes and is the whole of the preparation.
Include
- Anything taken only occasionally
- Unlabelled powders from anyone
Ask once, properly
Hand the bag over at the planning appointment or the next review and ask for a written answer: what continues, what pauses, what can restart afterwards. One conversation settles months of uncertainty.
Let the doctor be the one who refuses
When a relative is pressing something on you, a doctor's instruction carries weight your refusal does not. Ask for it in writing if that helps. It moves the argument out of the household.
Useful wording
- "The oncologist has asked me to pause this."
- "I will ask at the next visit."
Keep cooking normally
None of this is an argument against turmeric in dal or tulsi in tea. Keep the kitchen as it is, and treat only the dosed products as the question to be answered.
!
Stop and get medical advice the same day for these
Yellowing of the eyes or skin · dark urine or very pale stools · pain over the right upper part of the stomach · persistent vomiting or complete loss of appetite · a spreading rash or itching over the body · unusual bruising or bleeding · severe loose motions. Take the preparation and its packet with you and say what has been taken and for how long. Do not throw the bottle away, because the ingredient list is what the doctor needs to see.
Being straight with you
What this page cannot tell you
It cannot tell you whether your product is safe with your drugs. That depends on what is actually in it, what you are being given and how your liver and kidneys are working. It is a question for your oncologist or pharmacist with the packet in hand.
It also cannot tell you that these preparations are worthless. Several are being studied, and some may turn out to help with particular problems. What is not established is that any of them should be taken in high doses alongside chemotherapy without the team knowing.
Supplements are not regulated like medicines
The amount in a capsule may differ from the label and between batches, and some products contain ingredients that are not declared. That variability is itself a reason to bring the bottle and to prefer food where food will do.
Most of these can restart afterwards
People assume a pause is permanent, then quietly restart early. Ask at your last cycle which items can resume and when, and get it in writing for your own file and your family doctor.
What to do next
Put every bottle on one shelf and photograph the ingredient lists. Take them to the next appointment and ask for a written answer. Keep cooking with ordinary spices. Let the doctor refuse anything a relative is pressing. And ask what can restart after treatment.
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Commonly believed
Four beliefs that keep these hidden
"These are kitchen ingredients, so capsules must be safe too."
A capsule delivers far more than cooking does, often with an absorption enhancer added. That is what makes it behave like a medicine and what makes it worth declaring. The spice in your dal is not the question.
"Giloy boosts immunity, which is exactly what I need now."
Your immune system during treatment is being managed deliberately by your team, and adding an unknown is not support. Liver irritation has also been reported with giloy, at a time when liver figures are being watched closely.
"The doctor will be angry, so it is better not to mention it."
They expect it and they ask about it, because almost every family here is taking something. The worst outcome of telling is being asked to pause one item. The worst outcome of silence is a liver problem nobody can explain.
"I only take it between cycles, so it does not count."
Drugs and their effects persist between cycles, and liver irritation does not stop at a cycle boundary. Timing it yourself is not a solution. Ask specifically rather than working around the question.
Questions we are asked
Common questions about these supplements
Do I need to stop turmeric in cooking?
Generally no. Ordinary use in dal, curry and rice is food rather than a dose. It is concentrated curcumin capsules and extracts that need asking about, particularly if they contain black pepper extract.
Can I take giloy for immunity?
Ask your oncologist with the packet in hand. Liver irritation has been reported with it, and your liver figures are already being watched. Stop and seek advice the same day if you notice yellowing of the eyes.
Is ashwagandha safe?
It needs discussing rather than assuming. It has effects on the immune system and on hormones, which makes it a genuine question during cancer treatment. Do not continue it without asking.
What about ordinary tulsi tea?
Food quantities are generally a different matter from concentrated extracts. The rule of thumb is that anything sold and taken as a dose needs mentioning, while ordinary cooking and tea usually do not.
My family insists on giving me something. What do I do?
Take it to your oncologist and let them decide, and ask for the answer in writing if that would help at home. A doctor's instruction settles these arguments far better than your refusal will.
I have been taking one for months. Is it too late to say?
No. Say so at the next appointment and bring the bottle. It changes how your results are interpreted and what happens next. Late disclosure is considerably better than continued silence.
Are these worth the money?
Not established for treating cancer, and often expensive. The money is generally better spent on food, transport and the prescribed supportive medicines, all of which have a clear effect on how the course goes.
Can I restart them after treatment?
Often yes. Ask at your last cycle which items can resume and when, and get the answer in writing for your own file and your family doctor. Do not restart early on your own judgement.
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Sources
- Cancer Research UK — Herbal medicine and cancer
- Macmillan Cancer Support — Complementary therapies
- National Cancer Institute — Complementary and Alternative Medicine
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