NutriStack
SynergyInsufficient evidence
What is happening. Both can support calm without strong evidence of dangerous interaction.
Mechanism. Complementary calming pathways.
Recommendation. Reasonable at low doses; assess alertness before work or driving.
Supplement × Supplement·a synergy·Insufficient evidence
L-Theanine + Lavender
Synergy
Insufficient evidence
Both can support calm without strong evidence of dangerous interaction.
From the database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
Substances
L-Theanine and Lavender
Pair type
Synergy
Evidence
Insufficient
Source citations
1
Scope
Supplement × Supplement
Last verified
June 4, 2026
Stack Score
How it moves the number.
Effect on the composite score
If both L-Theanine and Lavender 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.
Sources
Sources, by evidence tier.
Every claim on this page is cited. PMIDs link straight to PubMed.
Reference material
1- 1Yap WS et al. Silexan network meta-analysis. Scientific Reports. 2019.Needs sourceNo link
Check your full routine
One pair was the worked example.
Drop your supplements and prescriptions into NutriStack and it runs every pair at once: every interaction, synergy, timing rule, and contraindication, each linked to its primary source.