Ginkgo

What ginkgo is

Ginkgo comes from the Ginkgo biloba tree, a species so old it is often called a living fossil, with a long history of use in traditional Chinese medicine. The part used today is almost always the leaf, usually taken as an extract in capsules or tablets. It is sold as a supplement, which means it is not reviewed by the FDA the way prescription medicines are, so the actual content can vary from one product to the next.

This page is general education about ginkgo as a supplement. It is not a recommendation that you should or should not take it; that is a conversation to have with your clinician about your own situation.

What it is used for

The reason ginkgo comes up most in a psychiatric setting is memory and thinking. It is widely promoted for cognitive impairment and dementia, for sharpening cognitive performance in healthy people, and also for anxiety, premenstrual syndrome, schizophrenia, tinnitus, and several conditions outside of mental health.

Here it helps to be straight about the evidence, because there is a lot of it and it is not kind to ginkgo. Despite many studies, ginkgo has not been shown to be effective for any of the conditions it has been tested for. For dementia specifically, it has not been shown to prevent or slow the condition; a large study that followed more than 3,000 adults aged 75 and older for a median of about six years found no difference between ginkgo and a placebo. For anxiety and a few other uses there is a small amount of evidence, but the overall picture is not conclusive.

So ginkgo is not an established treatment for memory problems, mood, or focus. At most it is an optional piece some people choose to try, not a stand-in for the treatment that actually addresses what you are working on. Whether it makes sense for you depends on your history and what you are hoping it will do, and that is decided case by case. It is reasonable to bring it up alongside guides like anxiety and depression.

How it might work

Honestly, there is no proven mechanism to point to. Because ginkgo has been studied extensively without showing a clear benefit, there is nothing established to explain how it would improve memory, focus, or mood. It has a long traditional history and the leaf extract is what researchers have tested, but a plausible-sounding idea is not the same as a proven effect, and how a given person responds, if at all, is individual.

How people take it

If you and your clinician decide it is reasonable to try, a few general points apply, and the details are worth talking over rather than copying a number from a label or a website:

• Leaf extract only. The leaf extract is the studied form. Never use the seeds or the raw plant, which are a different and genuinely dangerous matter (see Interactions and safety).
• Products are not all the same. Strength and content vary between brands, so two bottles labeled the same way are not necessarily equivalent.
• More is not better. Going above what you and your clinician agree on adds risk rather than benefit.
• Clear it first if a few situations apply. If you take a blood thinner, are pregnant, or have surgery coming up, this is one to talk through before starting rather than after.

What to expect

This is worth setting honestly. Given that ginkgo has not been shown to help the conditions it is studied for, the most likely outcome is that you notice nothing, and that would not be a surprise. If you and your clinician do decide on a time-limited trial, pay attention to what genuinely changes rather than to what it is supposed to do. Noticing no benefit is useful information, not a failure, and it is fine to stop and look at better-supported options together. As always, this is case by case.

Possible side effects

For most adults, ginkgo leaf extract is likely to be safe when taken by mouth in moderate amounts. The side effects that come up are usually mild. The lists below are possibilities, not certainties.

Possible more common side effects:

• Dizziness
• Stomach or digestive upset
• Headache

Less common, but a concerning sign that could need urgent care:

• Signs of an allergic reaction: rash, hives, or swelling of the face, lips, tongue, or throat
• Any unusual or unexplained bleeding or bruising, which matters most if you take a blood thinner

For any of these, use the help options at the bottom of this page: call 911 or go to the nearest emergency department for a medical emergency or severe reaction, or call or text 988 for a mental health crisis.

Interactions and safety

This is the part most worth reading, because ginkgo carries two safety issues that are easy to overlook.

• Bleeding risk. Ginkgo may increase the risk of bleeding, and that risk is highest for people taking anticoagulant (blood thinning) medicines such as warfarin. It may also interact with other medicines. Because of the bleeding concern, it is reasonable to stop ginkgo well before any planned surgery, and to clear it first if you take a blood thinner.
• The seeds and raw plant are toxic. Fresh ginkgo seeds are poisonous when swallowed, and serious harm has occurred in people who ate roasted seeds or the crude plant. Only the leaf extract has been studied for use. Never eat the seeds, and keep them away from children.
• Pregnancy and breastfeeding. Ginkgo may be unsafe during pregnancy; it could trigger early labor or extra bleeding around delivery if used near that time. Little is known about whether it is safe while breastfeeding, so it is one to set aside unless your clinician says otherwise.

The simplest safeguard is to tell your clinician and pharmacist everything you take, including supplements and over-the-counter products, and to mention any blood thinner, any upcoming surgery, and whether you are pregnant or trying to become pregnant. Knowing the full picture lets us catch a problem before it happens and decide together whether ginkgo fits your plan.

When to contact your clinician

For routine questions, mild side effects, or whether ginkgo fits with the rest of your plan, send a message through the patient portal or bring it to your next visit. These are part of your ongoing care and are answered in the normal course of a few business days, so they are best for things that are not urgent.

If something feels urgent, you do not need to wait for a reply. The fastest way to get care is 911 or the nearest emergency department for a medical emergency, a severe reaction, or unusual bleeding, or 988 any time for a mental health crisis or thoughts of self-harm.

Questions to ask your clinician

• Given how weak the evidence is, is there any reason to try ginkgo in my situation?
• Could it interact with any of my medicines, especially a blood thinner?
• Is there any reason, like a surgery coming up or pregnancy, that it would not be safe for me?
• If my memory or focus is the real concern, what should we actually be looking at?
• How long would I try it before we decide whether it is worth continuing?