Supplement × Supplement·a synergy·Insufficient evidence
L-theanine may smooth anxiety or overstimulation from nootropic stacks, but it does not prevent cholinergic toxicity.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
What is happening. L-theanine may smooth anxiety or overstimulation from nootropic stacks, but it does not prevent cholinergic toxicity.
Mechanism. Theanine modulates relaxation and attention while huperzine A is cholinergic.
Recommendation. Reasonable for occasional use, but do not use theanine to justify higher huperzine A doses.
Effect on the composite score
If both Huperzine A 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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