focus
2 interactions related to focus
l-theanine + caffeine
L-theanine, an amino acid from tea, smooths out caffeine's stimulant effects by promoting alpha-wave brain activity associated with relaxed alertness, while caffeine blocks adenosine receptors to increase arousal — the combination has been shown in multiple human trials to improve sustained attention and reaction time more than either alone.
l-theaninecaffeinefocusattentionnootropicalpha-wavessynergycognitionalertness
caffeine + tyrosine
L-tyrosine is a precursor to dopamine and norepinephrine, and caffeine triggers their release; combining them can modestly improve cognitive performance under stress, fatigue, or sleep deprivation. The synergy is generally well tolerated, though it can mildly amplify caffeine's stimulant effects.
caffeinetyrosinenootropicfocuscognitive performancestressdopaminenorepinephrinestacksynergy