Are there any side effects or risks with using ginkgo biloba for hair health?

Ginkgo biloba, an extract from one of the world’s oldest tree species, has gained attention for its potential to boost blood circulation, including to the scalp. Many claims suggest that by increasing blood flow, more oxygen and nutrients could reach the hair follicles, potentially benefiting hair growth. However, it is essential to move past marketing narratives and examine what research actually says about its safety profile—especially if we are considering using it ourselves.

Why ginkgo biloba attracts attention for hair health

The active compounds in ginkgo, primarily flavonoids and terpenoids, have antioxidant and vasodilatory effects. Antioxidants neutralize free radicals—unstable molecules that can damage cells—while vasodilation means widening blood vessels to improve circulation. In theory, both mechanisms could support hair follicle function. Yet, these same properties can alter how our body regulates blood clotting, which is where the risks begin to emerge.

In reading official safety reports, one pattern becomes clear: while many people tolerate ginkgo well, it can cause systemic side effects. These include headaches, dizziness, gastrointestinal discomfort, and allergic reactions. More critically, laboratory studies show that ginkgo compounds can reduce platelet aggregation—the process where blood cells clump to stop bleeding—although one such study needed concentrations far above the blood levels reached with usual doses (Koch, 2005). Case reports of bleeding and official guidance (see below) are why ginkgo is treated as a possible risk for prolonged bleeding and during surgery.

For those of us considering ginkgo for hair health, this is significant. The goal is scalp support, but the action is systemic. Improving circulation does not just happen in the scalp—it happens throughout the body, affecting clotting and potentially interacting with medications such as aspirin, warfarin, or other anticoagulants.

Dosage realities

Studies of ginkgo for other conditions have used 120–240 mg a day of standardised extract; no dose has been tested for hair loss. But here’s the problem: supplements are not regulated by the U.S. Food and Drug Administration (FDA) for purity and dosage in the same way as prescription drugs. This means the actual content in a capsule could differ from the label.

Pregnant and breastfeeding individuals, people with bleeding disorders, and those scheduled for surgery are repeatedly identified in official guidance as high-risk groups. People with epilepsy should ask a doctor first: case reports describe seizures in people taking ginkgo, including a fatal breakthrough seizure in a man taking anticonvulsants, where the authors suggested ginkgo may have lowered his anticonvulsant levels (Kupiec & Raj, 2005). A JAMA review of herbal medicines and surgery advises stopping ginkgo before planned surgery (Ang-Lee et al., 2001).

Research insights on safety

Koch (2005) examined how ginkgo compounds affect platelet aggregation and considered the bleeding cases reported with ginkgo. He noted that a clear causal link between ginkgo intake and bleeding could not be established, and found that the ginkgolide concentrations needed to block one clotting pathway in the lab were more than 100 times the blood levels after usual doses. Koch worked for a company that makes a ginkgo extract.

Case reports describe bleeding, including subdural hematomas, in people taking ginkgo (for example Rowin & Lewis, Neurology 1996). Causation has not been established (Koch, 2005), but NCCIH advises that ginkgo may increase the risk of bleeding in people taking anticoagulant drugs such as warfarin, and that it may interact with other drugs. NCCIH lists dizziness, gastrointestinal symptoms and headache among its side effects, and notes it may be unsafe during pregnancy (NCCIH, 2025). Caution also applies to antiplatelet medicines such as aspirin or clopidogrel.

If we are deciding whether to take ginkgo biloba for hair health, the evidence is clear: it is not free of risk. Any effect on scalp circulation is unmeasured, while it may increase bleeding tendencies and trigger other systemic side effects.

The choice comes down to whether the potential benefits outweigh these documented risks. The fact that it is an herbal supplement does not make it inherently safe—especially for those of us on medications or with underlying health conditions.

User Experiences: Ginkgo Biloba for Hair Health

Discussions within the Tressless community show that Ginkgo biloba is mainly explored as a complementary option rather than a primary treatment for hair loss. Many users view it as a way to improve scalp blood circulation, especially in cases where vasoconstrictive medications, like Ritalin or Vyvanse, may be contributing to shedding. Do not add a supplement to counter the effects of a prescription stimulant without asking your prescriber. Some individuals report considering Ginkgo biloba after noticing hair thinning potentially linked to reduced blood flow, pairing it with vitamins and other hair supplements for broader support.

In other conversations, Ginkgo biloba appears as part of complex regimens. Some users integrate it into multi-ingredient topical formulas alongside finasteride, minoxidil, melatonin, and botanical extracts. Reports generally note minimal direct side effects from Ginkgo biloba itself, though it is often unclear whether perceived improvements in hair health are due to the supplement or other treatments used concurrently.

A few community members include Ginkgo biloba in supplement stacks aimed at addressing overall health markers—such as cholesterol, nutrient status, or circulation—believing that systemic wellness may indirectly improve hair outcomes. However, others remain skeptical about its potency compared to established DHT-blockers and growth stimulants, emphasizing that while it may help support scalp microcirculation, it is unlikely to reverse advanced hair loss on its own. Some caution is expressed regarding potential blood-thinning effects, especially for those combining it with other circulation-enhancing agents or before surgery. Overall, the sentiment is that Ginkgo biloba may be worth trying as a supportive measure for certain individuals, but expectations should be modest; users who try it tend to do so as part of a plan that includes approved treatments, and no study has shown that it adds to them.

References

Koch, E. (2005). Inhibition of platelet activating factor (PAF)-induced aggregation of human thrombocytes by ginkgolides: considerations on possible bleeding complications after oral intake of Ginkgo biloba extracts. Phytomedicine, 12(1–2), 10–16. https://pubmed.ncbi.nlm.nih.gov/15693702/

National Center for Complementary and Integrative Health. (2025, February). Ginkgo: Usefulness and safety. https://www.nccih.nih.gov/health/ginkgo

Rowin, J., & Lewis, S. L. (1996). Spontaneous bilateral subdural hematomas associated with chronic Ginkgo biloba ingestion. Neurology, 46(6), 1775–1776. https://pubmed.ncbi.nlm.nih.gov/8649594/

Ang-Lee, M. K., Moss, J., & Yuan, C. S. (2001). Herbal medicines and perioperative care. JAMA, 286(2), 208–216. https://pubmed.ncbi.nlm.nih.gov/11448284/

Kupiec, T., & Raj, V. (2005). Fatal seizures due to potential herb-drug interactions with Ginkgo biloba. Journal of Analytical Toxicology, 29(7), 755–758. https://pubmed.ncbi.nlm.nih.gov/16419414/

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