Stacking guide
What goes well with L-Theanine?
Evidence-graded stacking partners for L-Theanine. Synergistic and neutral combinations are listed alongside pairings to avoid. Use this to design a deliberate stack rather than experimenting blind.
Safe to stack with L-Theanine (4)
- CaffeineEVIDENCEA
The most widely consumed psychoactive substance in human history — roughly 80% of the global population uses it daily, mostly via coffee and tea. A competitive adenosine receptor antagonist that lifts the brake on dopamine and norepinephrine signalling. The canonical pairing is 100 mg caffeine + 200 mg L-theanine for clean focus without the jitter.
The most-studied nootropic synergy. 1:2 ratio (100mg caffeine + 200mg L-theanine).
- Magnesium L-ThreonateEVIDENCEB
MIT-developed magnesium that crosses the blood-brain barrier. Shown to enhance synaptic density and reduce 'brain age'.
Classic sleep pairing — magnesium calms NMDA, L-theanine raises alpha.
- ApigeninEVIDENCEB
Flavonoid found in chamomile, parsley, and celery. Popularized by Dr. Andrew Huberman for sleep and CD38 inhibition.
Both calming via GABA pathways at low risk.
- CreatineEVIDENCEA
The most-studied performance supplement in history, now well-evidenced as a cognitive enhancer in its own right. The brain consumes about 20% of resting metabolic rate, and creatine buffers ATP at the use site for fast regeneration — especially valuable under mental fatigue and sleep deprivation. Vegetarians benefit most because dietary creatine comes from animal flesh.
No known interaction.
Build a stack: use the Stack Builder with L-Theanine pre-selected, or check any specific pairing in the Interaction Checker.
Stacking guidance reflects curated interaction rules from the published literature, traditional use, and well-characterised mechanisms. Individual response varies; introduce one substance at a time and track effects. Not medical advice — see our disclaimer.