Supplement × Supplement·a caution·Emerging evidence
High-dose niacinamide and concentrated green tea extract can both raise liver-safety concerns in susceptible users.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
What is happening. High-dose niacinamide and concentrated green tea extract can both raise liver-safety concerns in susceptible users.
Mechanism. Potential additive hepatic metabolic burden.
Recommendation. Avoid high-dose stacking in liver disease and stop if jaundice, dark urine, or severe fatigue occurs.
Effect on the composite score
If both Green Tea Extract and Niacinamide 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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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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