L Theanine Vs L Carnitine: Can We Combine Them? Vinatura Supplements Better sleep, calmer mind, sharper focus can L theanine really deliver it all? L theanine appears to promote relaxation without sedation, and in some contexts, may also improve aspects of cognitive performance. Unlike many Best Supplements for ADHD in Women Noops Nootropics L Theanine: Best Supplement for Anxiety Relief The combination of coffee and L theanine is a proven way to enhance alertness while reducing the jitteriness some people get from high doses of caffeine., Multiple studies show that together they Buy L Carnitine Capsules 2050 mg per Serving