Caffeine and L-Theanine: Modest Effects, Real Limits
Caffeine and L-theanine are often sold as a calmer way to stay alert. That is a bigger claim than the evidence supports. Caffeine is the active stimulant here; L-theanine may soften some of caffeine’s rough edges for some people. What matters is the dose, the form, and whether the product on the shelf matches the … Read more