Ginkgo Biloba Extract

What it is

Ginkgo Biloba Extract is obtained from the dried green leaves of Ginkgo biloba L., one of the oldest living tree species on Earth. Standardized extract preparations, designated as EGb 761, typically contain 24% ginkgo flavonoid glycosides and 6% terpene lactones (ginkgolides and bilobalide). In nutritional formulations, it is presented as a concentrated dry powder designed to support cerebral blood flow, vascular microcirculation, and cellular protection against free radical oxidation.

Also known as: Ginkgo, Maidenhair Tree, Ginkgo Biloba

Key benefits

• Enhances cerebral microcirculation and peripheral blood flow to support cognitive sharpness and oxygen delivery.
• Provides neuroprotective antioxidant support by neutralizing reactive oxygen species in neuronal tissues.
• Supports memory retention, executive focus, and processing speed during age-related cognitive changes.
• Modulates platelet-activating factor signaling to promote healthy vascular tone and capillary integrity.

Amplified by probiotics

The bioaccessibility and systemic efficacy of Ginkgo biloba extract depend significantly on intestinal gut bacterial metabolic activity. Gut commensal bacteria hydrolyze complex ginkgo flavonoid glycosides into active aglycones and low-molecular-weight phenolic acids, which cross the intestinal epithelium far more efficiently than parent compounds. Microencapsulated live probiotics foster an optimal, balanced colonic microenvironment and favorable luminal pH that enhances these specific microbial enzymatic hydrolyses. Furthermore, probiotics strengthen the intestinal epithelial tight junctions, reducing systemic endotoxemia and low-grade neuroinflammation. This vascular and anti-inflammatory synergy supports the gut-brain axis, allowing absorbed ginkgo metabolites to act synergistically with probiotic-derived short-chain fatty acids in supporting cerebral perfusion and cognitive vitality.

Typical dose

120–240 mg/day

The evidence

Extensive clinical literature, including large meta-analyses and Cochrane reviews, demonstrates that standardized Ginkgo biloba extract improves cognitive function, memory performance, and daily living activities in adults with age-associated cognitive decline. Clinical trials confirm its cardiovascular and microcirculatory benefits at daily doses of 120 to 240 mg. Systematic evaluations highlight a favorable safety profile across long-term human interventions.

1. Tan MS, et al. Efficacy and adverse effects of ginkgo biloba for cognitive impairment and dementia: a systematic review and meta-analysis. J Alzheimers Dis. 2015;43(2):589-603. PubMed ↗
2. Hashiguchi M, et al. Meta-analysis of the efficacy and safety of Ginkgo biloba extract for the treatment of dementia. J Pharm Health Care Sci. 2015;1:14. PubMed ↗
3. Yang G, et al. Ginkgo Biloba for Mild Cognitive Impairment and Alzheimer's Disease: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Curr Top Med Chem. 2016;16(5):520-528. PubMed ↗

Safety & who should check first

Standardized ginkgo extract is generally well tolerated, with mild, infrequent side effects such as headache or digestive upset. Due to mild antiplatelet effects, caution and medical consultation are recommended when taking anticoagulants or prior to surgery.