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Before your biopsy

Herbal Supplements and Bleeding Risk — What to Tell Your Team Before a Biopsy

Turmeric, garlic, ginkgo and fish oil are found in everyday Indian households and all of them affect how blood clots. Before a biopsy, your team needs to know about every supplement you take — not just prescribed medicines.

Medically reviewed by Dr. Muralidhar Muddusetty, Surgical Oncologist, MBBS (AIIMS) · MS Surgery (AIIMS) · DNB Surg Onc · MRCS (Edinburgh) · Last reviewed September 2026

  • Common supplements, real effect — Turmeric, garlic, ginkgo and fish oil all have documented effects on clotting. They are not invisible to a biopsy.
  • Natural does not mean harmless — Traditional or non-prescription does not mean no effect. Many Ayurvedic formulations contain multiple clot-affecting ingredients.
  • Both doctors need to know — Tell the doctor performing the biopsy and your oncologist separately — they may not share notes automatically.
  • Timing is your team's decision — Do not stop or restart any supplement without asking. Your team needs your full list before giving any advice.
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Turmeric, garlic, ginkgo and fish oil are among the most common supplements that affect clotting, and all four are widely used across Indian households. Every supplement must be disclosed to your biopsy team before the procedure — not just prescribed medicines. Your team decides whether and when to pause them.

If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.

How do you know if a supplement is a concern before your biopsy?

FeatureLower concernNeeds disclosure — do not proceed without flagging
Supplement categoryNot from a known high-risk categoryTurmeric, garlic, ginkgo biloba, fish oil, vitamin E, or ginger in any form
How you are taking itOccasional use in cooking onlyDaily capsules, powders, or concentrated extract form
Combined with a prescribed blood thinnerNot taking any prescribed blood thinnerTaking both a herbal supplement and a prescribed blood thinner — neither doctor told about both
Your team's awarenessBoth your oncologist and biopsy doctor already know your full listNeither doctor has been given your complete supplement list
Typically starts matteringTeam notified well before the procedure dateBiopsy is soon and your team does not yet have your supplement list

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Which herbal supplements affect your bleeding risk?

Turmeric (haldi), garlic, ginkgo biloba, and fish oil are the four supplements most consistently associated with reduced clotting, as noted in oncology guidance from bodies including ASCO and ESMO. All four are found in everyday Indian households and are rarely thought of as medicines that need disclosing.

Vitamin E and ginger also have documented effects on clotting. Many Ayurvedic formulations combine several of these ingredients, and the combination can have a stronger cumulative effect than any single ingredient alone.

The concern is not that one supplement will automatically cause a serious bleed. It is that your team cannot assess your full risk without knowing everything you take. Two things with modest individual effects can add up to something meaningful when combined — particularly if a prescribed blood thinner is also involved.

What do you need to tell your team before the biopsy?

  • List every supplement by name, including Ayurvedic and homeopathic preparations
  • Include things you think of as food — garlic capsules, turmeric tea, and ginger shots all count
  • Tell both your oncologist and the doctor performing the biopsy separately — they may not share notes automatically
  • Bring the packaging so your team can read the full ingredients list, not just the brand name
  • Do not stop any supplement on your own without asking — some can cause problems when stopped without guidance
  • Ask explicitly what to do and when — do not assume that no instruction means no action is needed

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Common questions

Frequently asked questions

Does turmeric really affect bleeding, or is that a myth?

It is real and well documented. Turmeric — and concentrated turmeric supplements in particular — has established effects on platelet function, recognised in oncology guidance from bodies including ASCO. The amount in everyday cooking matters less than high-dose capsule or extract forms, but your team will want to know about both. Whether it is relevant to your specific biopsy depends on factors only your team can weigh, which is why disclosure is more useful than trying to decide for yourself.

My cardiologist said to keep taking fish oil but my surgeon said to stop. Who is right?

Both may be right from their own perspective. Your cardiologist is protecting your cardiovascular health. Your surgeon is protecting your biopsy site. Neither has the complete picture without talking to the other. Ask one of them to call the other directly, or ask your oncologist to coordinate — oncologists carry this bridging role regularly. You should not be the one choosing between two conflicting instructions.

Do I need to tell my team about Ayurvedic medicines?

Yes, and they are particularly important to disclose. Ayurvedic formulations often contain several herbs in combination, and the cumulative effect on clotting can be stronger than any single ingredient alone. Being traditionally prescribed or widely used does not make these preparations invisible to a biopsy. Bring the packet or bottle so your team can read the full ingredients list rather than relying on the brand name alone.

I forgot to mention a supplement and the biopsy has already happened. What do I do?

Tell your team now, before you leave the clinic if possible. You do not need to wait for a problem to appear. Knowing what you took allows your team to monitor you appropriately and act quickly if anything changes at the biopsy site. It is not too late to disclose, and your team is better placed to help you once they have the full picture.

If something is available without a prescription, does it really affect my blood?

Non-prescription does not mean non-active. Some of the most reliably documented effects on clotting come from supplements available at any pharmacy or grocery store. Supplements sold in India are not subject to the same standardised safety testing as prescription medicines, which means the concentration of active ingredients in capsule or extract form can vary significantly. Disclose all of them to your team regardless of where they came from or who recommended them.

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