Supplement × Supplement·a synergy·Moderate evidence
Theanine may smooth caffeine-related jitteriness while preserving attention benefits.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
What is happening. Theanine may smooth caffeine-related jitteriness while preserving attention benefits.
Mechanism. Caffeine increases arousal while theanine modulates glutamate and alpha-wave activity.
Recommendation. Common pairing at moderate doses, such as 100 mg caffeine with 200 mg theanine.
Effect on the composite score
If both Caffeine and L-Theanine are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are at /methodology/stack-score.
Every claim on this page is cited. PMIDs link straight to PubMed.
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NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.
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