Ginkgo Biloba: Benefits, Safety, and Dosage

Lindsey Desoto is a licensed, registered dietitian and experienced medical writer.

Allison Herries, MS, RDN, CDN is a registered dietitian. She is focused on preventing and managing chronic diseases through healthy lifestyle changes.

Ginkgo biloba, also known as the maidenhair tree, is one of the oldest living tree species in the world. It is native to China, where its seeds have been used for centuries in traditional Chinese medicine to help improve cognitive health and treat asthma, bronchitis, and kidney and bladder disorders.

Today, ginkgo biloba, the extract made from the tree's dried leaves, is widely available in supplement form. While research is limited, there is some evidence that ginkgo extract may help improve symptoms of dementia and enhance blood flow.

This article discusses the potential benefits and uses of ginkgo biloba. It also covers the risk factors and side effects of taking ginkgo biloba supplements.

Dietary supplements are not regulated the way drugs are in the United States, meaning the Food and Drug Administration (FDA) does not approve them for safety and effectiveness before products are marketed. When possible, choose a supplement tested by a trusted third party, such as U.S. Pharmacopeia (USP), ConsumerLab.com, or NSF International.

However, even if supplements are third-party tested, they are not necessarily safe for all or effective in general. Therefore, it is important to talk to your healthcare provider about any supplements you plan to take and ask about potential interactions with other supplements or medications.

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Supplement use should be individualized and vetted by a healthcare professional, such as a registered dietitian, pharmacist, or healthcare provider. No supplement is intended to treat, cure, or prevent disease.

Further studies are needed to confirm the health benefits of ginkgo biloba. However, it appears to be most effective for cognitive health. The herb may also help protect against cell damage, support eye health, and improve blood flow.

Ginkgo biloba has been used for years to treat memory loss, cognitive decline, and decreased alertness.

Preliminary research suggests it may help improve symptoms of dementia, which is a progressive impaired ability to think, remember, and make decisions, which interferes with performing daily activities.

A 2020 mini-review of studies on ginkgo biloba found that taking at least 240 milligrams (mg) of the leaf extract daily for more than 24 weeks may improve cognitive function in people with mild dementia. Shorter-term use with lower doses did not show significant benefits.

Similar cognitive improvements were also seen in a 2023 pilot study involving older adults with mild to moderate stroke. However, the study received funding from a pharmaceutical company, raising concerns about potential bias.

Still, the beneficial effects of ginkgo biloba are thought to be partially due to the herb's ability to increase blood flow to the brain.

While research appears promising, further long-term studies are needed to confirm its effectiveness. Additionally, there is no solid evidence to suggest that ginkgo biloba can prevent dementia, cognitive decline, or the progression of Alzheimer's related-dementia.

Ginkgo biloba leaves are a rich source of flavonoids and terpenoids with potent antioxidant activity.

Antioxidants are compounds that prevent or delay damage caused by free radicals.

Free radicals are harmful, unstable molecules produced during normal cell division that can disrupt many natural processes in the body, including breathing and digesting food. External factors like exposure to sunlight and cigarette smoke can also lead to the production of free radicals.

When free radicals build up, they can lead to cell damage and health problems.

While further studies are needed, ginkgo biloba extract appears to be a promising treatment for age-related eye diseases.

A 2013 review of two small studies on people with age-related macular degeneration suggested possible improvement in vision after six months of ginkgo biloba administration.

In addition, ginkgo biloba is a popular alternative treatment for glaucoma, a progressive eye disease that damages the optic nerve leading to vision loss.

A 2013 observational study on 42 people with normal tension glaucoma reported vision improvements with 80 mg of ginkgo biloba extract administered orally twice daily over four years.

However, a 2014 randomized control trial in 35 patients found no significant improvement in vision after being treated with ginkgo biloba.

Its positive effects on vision are thought to be primarily due to its antioxidant and anti-inflammatory properties and its ability to improve blood flow to the eye and protect neurons from damage.

More extensive studies are needed to understand the effects of ginkgo biloba on eye health.

The flavonoids and terpenes in ginkgo biloba have strong antioxidant and anti-inflammatory properties, which can benefit heart health. Furthermore, the herb's potential ability to improve blood flow and reduce blood pressure may positively affect heart health.

Ginkgo biloba seems to be most effective when combined with traditional therapies.

A 2015 systematic review of 23 randomized control trials involving 2,529 people found that, when combined with routine medicine, ginkgo biloba extract was more effective at relieving angina pectoris than routine medicine alone.

Angina pectoris, or stable angina, is chest pain or discomfort caused by heart disease. It occurs when there is inadequate blood supply to the heart.

It is important to mention, however, that most of the studies supporting the use of ginkgo biloba for blood pressure reduction have been conducted in rats. Human studies have produced mixed results.

As such, it is not known for certain if these same effects will occur in humans.

There is growing evidence that ginkgo biloba may be effective at improving depression.

One 2018 study in 136 adults 60 and older with depression showed that, when combined with an antidepressant, ginkgo biloba can effectively improve symptoms of depression and decrease levels of S100B, a marker of brain injury.

Another 2019 randomized control trial in 40 people with depression after having a stroke found that those who consumed ginkgo biloba with an antidepressant medication experienced significant improvements in depressive symptoms compared to those who only took an antidepressant.

Nonetheless, most studies have been conducted in animals or older adults. Further studies are needed to understand the relationship between ginkgo biloba and depression in the wider population.

In addition to the potential health benefits listed above, some people use ginkgo biloba to improve the following conditions:

Although consuming moderate amounts of ginkgo biloba seems to be safe for most people, there are some potential side effects to be aware of, including:

Ginkgo biloba may be unsafe during pregnancy, as it may cause early labor or excessive bleeding if used near delivery.

Little is known about its safety in nursing people or children.

There is some evidence that it may increase the likelihood of having seizures. People with epilepsy or those prone to seizures should avoid ginkgo biloba unless otherwise instructed by their healthcare provider.

Ginkgo biloba may increase the risk of bleeding, so individuals with bleeding disorders should use it cautiously.

Always speak with a healthcare provider before taking a supplement to ensure that the supplement and dosage are appropriate for your individual needs.

There are no official recommendations on how much ginkgo biloba a person should take. However, most studies have used daily doses of 60 to 240 mg, often divided into smaller doses throughout the day without significant side effects.

While there is no established upper limit for ginkgo biloba extract, some research suggests that the maximum recommended daily dose is 240 mg daily.

Long-term or high-dose ginkgo biloba use seems more likely to cause adverse side effects.

Ginkgo biloba supplements may interact with certain medications, including:

Consult with a healthcare provider before using ginkgo biloba, especially if taking other herbal supplements or prescription medications.

Store ginkgo biloba supplements in a dry, cool place away from moisture and direct sunlight and out of the sight and reach of children and pets. When stored properly, most supplements will last up to two years.

However, there are many formulations and manufacturers of ginkgo biloba supplements, so always follow storage instructions as provided on the supplement label.

Supplements can lose potency as they age, so most manufacturers recommend discarding them after expiration.

Ginkgo biloba supplements can be purchased from local retail stores and health supplement stores. They are available in the form of:

Look for supplements that contain ginkgo biloba in a form called EGb 761, which is standardized to contain 24% flavonol glycosides and 6% terpenoids. This form has been used in most clinical trials showing positive health benefits.

It's also a good idea to purchase from a reputable supplier that utilizes third-party testing, such as from USP or ConsumerLab.com, to ensure what is in the supplement matches the product label.

Other herbal supplements with similar, health-promoting properties include:

Carnosine is a dipeptide naturally produced by the human body. It is made from the amino acids alanine and histidine. Although research is limited, preliminary studies suggest that carnosine may be protective against cognitive decline, both in older adults and individuals with mild cognitive impairment.

Curcumin, a substance in turmeric, has powerful anti-inflammatory properties and may help improve memory and attention in older adults without dementia.

Lycopene, a potent antioxidant found in red and pink fruits and vegetables, can support heart and cognitive health. It may also improve sleep quality and reduce the risk of certain cancers, such as prostate cancer.

In most cases, ginkgo biloba is considered safe when consumed daily in moderate amounts. However, it's important to contact your healthcare provider before use, especially if you have any existing medical conditions or are taking prescription medications or supplements.

Little is known about the safety of ginkgo biloba in breastfeeding people, pregnant people, or children. Additionally, individuals with seizure disorders or bleeding disorders should avoid using ginkgo biloba unless approved by a healthcare provider.

Ginkgo biloba may help increase blood flow to the brain, which may potentially help with brain fog. However, this has not been confirmed in research.

Ginkgo biloba is an herb with anti-inflammatory, antioxidant properties traditionally used in Chinese medicine. It may also help improve circulation and blood flow. Because of these properties, some evidence suggests that the herb may offer health benefits such as improving symptoms of dementia and supporting eye health. However, more research is needed to understand its safety and effectiveness fully.

If you're considering taking ginkgo biloba supplements, talk with your healthcare provider to discuss how they may benefit or affect your health.

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By Lindsey DeSoto, RD, LDLindsey Desoto is a registered dietitian with experience working with clients to improve their diet for health-related reasons. She enjoys staying up to date on the latest research and translating nutrition science into practical eating advice to help others live healthier lives.