L-Theanine + Caffeine Stack
The science-backed calm focus duo
The L-Theanine + Caffeine stack is the world's most studied nootropic combo. Dozens of clinical trials confirm that together they deliver sharp focus without the jitteriness or heart palpitations of caffeine alone.
How does it work?
Alpha Waves
L-Theanine increases alpha waves (8–12 Hz) as measured by EEG — the mental state associated with creativity and active mindfulness. Caffeine alone does not increase them.
Alertness without anxiety
Caffeine blocks adenosine receptors to maintain wakefulness. L-Theanine modulates NMDA and AMPA receptors to reduce associated anxiety — without impairing alertness.
Proven synergy
A 2016 meta-analysis (Camfield et al.) across 7 controlled studies concluded the stack significantly improves processing speed and accuracy on sustained attention tasks.
Protocol & Dosage
Take 200 mg L-Theanine + 100 mg caffeine (coffee, tea or supplement)
Peak effect — ideal for starting a work or study session
Duration — the stack stays active without a hard energy crash
Avoid after 2 PM to protect sleep (caffeine half-life: 5–7h)
Frequently asked questions
Caffeine is not recommended for pregnant women, people with heart sensitivity, or children. Consult a doctor if you are taking medications.
