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.