Ginkgo Biloba
One of the most-studied herbs for cerebral blood flow, with an important safety note.
Mechanism
Ginkgo biloba extract is associated with supporting healthy blood circulation, including to the brain. Better circulation is relevant to alertness and mental clarity, since neurons depend on a steady supply of oxygen and glucose delivered through the bloodstream.
What the evidence shows
Ginkgo has one of the longer, larger research bases of any botanical in this category. Trial results are mixed but lean supportive, particularly in older adults dealing with age-related cognitive changes — a well-researched ingredient, not a guaranteed one.
Safety notes
Ginkgo can thin the blood. This is a genuine, actionable safety note — raise it with your doctor before use if you take blood-thinning medication or have a procedure scheduled. Not recommended during pregnancy or nursing without medical guidance.