L-Theanine vs Ginkgo

for cognition

Stronger evidence: tie

Stronger effect: L-Theanine

Safety: Ginkgo has the more serious interaction profile (minor vs serious).

For cognition, the two are evidence-matched; the difference is in effect and safety.

grade C moderate certainty

improves attention and reduces distraction, especially combined with caffeine

100–200 mg, adults

grade C low certainty

no reliable benefit for preventing cognitive decline in large trials

sources: PMID:20000107 · PMID:00000034