Focus
L-Theanine
L-Theanine is an amino acid that can smooth caffeine-related focus and attention effects in studied pairings.
How it counts: Counts toward the grade
One of the core ingredients the Dose score (and so the grade) is built on. A product earns credit for it up to the clinical dose.
- Clinical dose
- 100–200 mg
- Safety ceiling
- —
- Evidence
- moderate
- Category
- Focus
Evidence summary
Research confidence: high
Most positive studies pair ~100-200 mg L-theanine with 150-160 mg caffeine (roughly 1:1 to 1:1.6 ratio), improving attention/accuracy and reducing distractibility versus caffeine alone.