Ginkgo and bleeding-risk questions: Why medicine lists change the herbal conversation

Short answer: a medicine list changes the ginkgo conversation because of one documented concern. The National Center for Complementary and Integrative Health (NCCIH) says ginkgo may increase the risk of bleeding in people who take anticoagulant drugs such as warfarin. It also says ginkgo may interact with other drugs. So a question that looks like simple supplement shopping becomes a question for a pharmacist or prescriber once a medicine is on your list.

Your next step is practical: write down every medicine and supplement you use, with the exact labels, and show that list to a pharmacist or prescriber before you start ginkgo. Please do not stop, skip, or change a prescribed medicine on your own because of anything on this page.

This guide explains what “bleeding risk” means in the sources we checked, where the evidence is thin, and how one incomplete list can change a conversation. It cannot tell you whether ginkgo is right for you.

What the two main sources say

NCCIH describes ginkgo leaf extract as likely to be safe for most adults in moderate amounts. The most common side effects it lists are dizziness, stomach symptoms, and headache. It then adds the point that matters here: ginkgo may raise bleeding risk for people taking anticoagulant drugs such as warfarin, and it may interact with other drugs. If you take any type of medicine, NCCIH advises talking with your health care provider before using ginkgo or other herbal products.

MedlinePlus explains the medicine side. Blood thinners keep blood clots from forming, but they do not break up clots you already have. Bleeding is the most common side effect. MedlinePlus says blood thinners may interact with certain foods, medicines, vitamins, and alcohol, and that your provider should know every medicine and supplement you use. It adds that some people need regular blood tests to check how well their blood is clotting, because the aim is enough medicine to prevent clots but not so much that it causes bleeding.

Why a supplement belongs on a medicine list

It is easy to sort products into “real medicines” and “things from the supplement aisle.” The sources do not draw that line. NCCIH tells people who take any medicine to raise herbal products with a provider, and MedlinePlus tells people on blood thinners to make sure their provider knows about supplements too. NCCIH also notes that dietary supplements are not approved by the FDA before they are sold. Whether that changes the interaction question for a particular product is something these pages do not say.

Annotated comparison: where ginkgo and a medicine list meet

Each item says what the sources report, then what they do not establish. Treat the “not established” notes as limits on what anyone can conclude from these pages.

Ginkgo leaf extract. NCCIH reports a possible increase in bleeding risk for people taking anticoagulants. Not established: how likely bleeding is, what amount of ginkgo matters, or whether a given retail product contains the same extract that was studied. Assumption: the product contains what its label says. Our guide to why a leaf source does not establish the standardized amount explains why that assumption deserves a second look.
Anticoagulants such as warfarin. This is the group NCCIH names. MedlinePlus gives heparin and warfarin as examples and says they slow down the body’s process of making clots. Not established: the pages reviewed give no amount or timing of ginkgo that is considered safe alongside an anticoagulant.
Antiplatelet medicines such as aspirin and clopidogrel. MedlinePlus describes these as a separate type of blood thinner that stops platelets from clumping together. NCCIH’s bleeding statement names anticoagulants, and its separate statement that ginkgo may interact with other drugs does not list which ones. Not established: the pages reviewed do not say how ginkgo behaves alongside antiplatelets. That is a reason to ask, not a reason to assume either “fine” or “dangerous.”
Other medicines. Because NCCIH’s advice covers “any type of medicine,” a list with no blood thinner on it can still matter. Not established: which other medicines are involved. That is a pharmacist’s question, and these pages cannot answer it.
Pregnancy. NCCIH says ginkgo may be unsafe during pregnancy and might cause early labor or extra bleeding during delivery if used near that time. Not established: how common this is. If it applies to you, it belongs in the conversation with your prenatal care team.

Worked example: two lists, one appointment

This is a hypothetical illustration, not a real case. It says nothing about how often anything like this happens or what any person’s outcome would be.

Assumptions:

An adult takes a prescribed anticoagulant every day and keeps it in a phone note titled “medicines.”
They also take a ginkgo capsule a few times a week and think of it as “just an herb,” so it is not in that note.
They have an upcoming appointment where staff will ask what they take.

The mixed-up version. The person files ginkgo under “not a medicine” and reads out the phone note. The clinician hears one prescription, so the question NCCIH says belongs in the conversation, whether ginkgo and an anticoagulant overlap, never comes up. Nobody did anything dramatic. The clinician simply worked from a list with a piece missing, and the person left believing they had been fully reviewed.

The clearer version. The person keeps one list of everything they take on purpose: prescriptions, over-the-counter products, and supplements, each with its exact label. They hand it over, say “I also take ginkgo, here is the bottle,” and ask what that means alongside their anticoagulant. The pharmacist or prescriber can weigh it with what they know about the person’s health and monitoring. Neither the sources nor this example say what that answer would be. The only thing that changed is that the question could be asked.

What the example does not show. It does not show that ginkgo caused or would cause bleeding in anyone, and it does not suggest anyone start or stop a medicine. It shows how a gap in a list, rather than the herb itself, can be the weak point.

What about the benefit side?

NCCIH states there is no conclusive evidence that ginkgo is helpful for any health condition. In the Ginkgo Evaluation of Memory (GEM) study, more than 3,000 people age 75 or older took ginkgo or a placebo for a median of 6 years, and rates of dementia did not differ between the groups. NCCIH says ginkgo extract may have a modest benefit for dementia symptoms, particularly at relatively high doses, but the evidence is inconsistent. None of that rules ginkgo out for anyone. It does mean that if you are weighing ginkgo against a possible interaction, asking your clinician what benefit to realistically expect is a fair question.

Evidence limits

The NCCIH ginkgo page was last updated in February 2025, and the MedlinePlus blood thinners page on June 27, 2024. Guidance can change.
A 2019 review of herbal supplements with bleeding potential (Abebe, EPMA Journal) lists ginkgo among its keywords. Its abstract says most of the available information on blood-thinning herbs comes from laboratory experiments, animal studies, and individual case reports, and that some effects are speculated on theoretical grounds. We could read only the abstract, not the full paper, so we cannot say what it concludes about ginkgo specifically.
None of the sources we could open gives an amount, schedule, or stopping time for ginkgo that is considered safe with a specific medicine, so this guide does not either.
The scenario above is invented. No real label, person, or clinic was used.
Nothing here diagnoses a condition, recommends a product, or replaces advice from someone who knows your health history.

Your next step

Make one list of everything you take: prescriptions, over-the-counter products, vitamins, and herbal supplements. Photograph or copy each label, including any ginkgo product.
Take the list to a pharmacist or your prescriber before you start ginkgo, and ask about ginkgo by name.
Keep taking prescribed medicines as directed unless the prescriber who manages them tells you otherwise.
If you take a blood thinner, know the warning signs MedlinePlus lists, including a serious fall or bump on the head, red or black bowel movements, red or brown urine, bleeding from the gums or nose that does not stop quickly, and unusual bruising. MedlinePlus says to call your provider if you notice any sign of serious bleeding.
If your question is about dizziness rather than bleeding, see our guide to how timing, hydration, and blood-pressure medicines can overlap.

Sources checked October 8, 2026

National Center for Complementary and Integrative Health (NCCIH). Ginkgo: Usefulness and Safety. Last updated February 2025.
National Library of Medicine, MedlinePlus. Blood Thinners. Last updated June 27, 2024.
Abebe W. Review of herbal medications with the potential to cause bleeding: dental implications, and risk prediction and prevention avenues. EPMA Journal. 2019;10(1):51-64. doi:10.1007/s13167-018-0158-2. Abstract only.

By DrBaba.com Health Research Team

This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.