herb · for brain fog
Ginkgo
Meant to widen blood vessels in the brain and protect nerve cells.
Say that in clinical terms
Enhances cerebral blood flow via vasodilation and provides neuroprotection through flavonoid glycoside antioxidant activity.
How strong is the research?
1 paper read.
Who was studied: Patients with diagnosed cognitive impairment or dementia across 36 trials.
Cochrane concluded the benefit is not predictable or clinically significant.
How much to take
daily
120–240 mg
Standardized to 24% flavone glycosides and 6% terpene lactones. Take with meals.
Before you take it
- Increases bleeding risk when combined with warfarin; pharmacovigilance data show HR 1.38 (95% CI 1.20–1.58) vs. warfarin alone. Additive risk with antiplatelet agents (aspirin, clopidogrel) and NSAIDs.
- Discontinue at least 2 weeks before any surgical or invasive procedure due to anticoagulant and antiplatelet properties.
- Contraindicated in pregnancy: possible uterotonic effects and increased peripartum bleeding risk documented.
- In vitro CYP2C9 and CYP3A4 inhibition by biflavonoid components is confirmed; clinical pharmacokinetic studies at recommended doses (120–240 mg/day EGb761) show no significant in vivo CYP interactions. Minor effects appear only at supra-therapeutic doses (≥360 mg/day). Pharmacokinetic caution is appropriate for narrow-therapeutic-index co-medications.
- No Tolerable Upper Intake Level (UL) established by NIH ODS or IOM for Ginkgo biloba. Standardized extract (EGb761) has been used safely in trials up to 6 years at standard doses; raw ginkgo seeds and crude plant material contain ginkgotoxin (4'-O-methylpyridoxine) and carry seizure risk — standardized extract removes this compound.
- Breastfeeding safety is unknown; use during lactation is not recommended.
What we make of it
Cochrane concluded the benefit is not predictable or clinically significant.
The detail
The review is a legitimate pooled analysis, and its conclusion was explicit: there is no evidence that ginkgo produces a predictable or clinically meaningful benefit for cognitive problems.