Supplement × Prescription·a caution·Moderate evidence
Caffeinated green tea extract can add to methylxanthine stimulation and may worsen tremor, insomnia, tachycardia, nausea, and arrhythmia risk.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
What is happening. Caffeinated green tea extract can add to methylxanthine stimulation and may worsen tremor, insomnia, tachycardia, nausea, and arrhythmia risk.
Mechanism. Additive adenosine antagonism and sympathetic stimulation from caffeine and theophylline.
Recommendation. Avoid high-caffeine extracts and keep caffeine intake stable; check theophylline levels if symptoms occur.
Effect on the composite score
If both Green Tea Extract and Theophylline are in the same stack, this pair applies −5 to your Stack Score (per scored caution 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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