L-Theanine
Often paired with caffeine for 'calm focus'; evidence suggests reduced jitteriness and improved attention in some contexts.
Stacks containing L-Theanine
Public community stacks that include this ingredient.
PMS Calmer (Low-Stim, Cycle-Friendly)
Cycle-phase support focused on calm and sleep quality without stimulants.
Focus Stack (No Stimulants)
Supports focus and mental clarity without stimulants.
Sleep & Recovery Stack
Designed to support sleep quality, parasympathetic activation, and overnight recovery without heavy sedation.
Clean Stimulant Focus Stack
Supports alertness with lower jitter risk than caffeine.
Non-Stimulant Focus Stack
Supports attention and cognitive resilience without stimulants.
L-theanine (100 mg) + caffeine (50 mg) improved attention-switching speed and accuracy vs. placebo at 60 min; L-theanine alone showed no significant cognitive effects.
L-theanine showed dose-dependent effects on rapid visual information processing and recognition reaction time; non-significant for simple reaction time and Stroop. Overall evidence promising but not conclusive.