What kind of interaction is it?

Caution: an interaction that may reduce efficacy or raise side-effect risk and warrants monitoring.

Is this interaction backed by published research?

Yes. NutriStack lists 1 citation row for the EGCG (Epigallocatechin Gallate) + NAC pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Supplement·a caution·Emerging evidence

EGCG (Epigallocatechin Gallate) + NAC

Q: Can I take EGCG (Epigallocatechin Gallate) and NAC together?

Possibly, but with caution. EGCG (Epigallocatechin Gallate) and NAC have a documented caution-tier interaction. High-dose EGCG can be hepatotoxic in susceptible individuals. NAC is hepatoprotective (a glutathione precursor and the antidote for acetaminophen toxicity), so co-use is not harmful, but stacking multiple high-dose polyphenols and supplements complicates monitoring of liver-related effects.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

Caution Emerging evidence

High-dose EGCG can be hepatotoxic in susceptible individuals. NAC is hepatoprotective (a glutathione precursor and the antidote for acetaminophen toxicity), so co-use is not harmful, but stacking multiple high-dose polyphenols and supplements complicates monitoring of liver-related effects.

Supplement × Supplement

Open the interaction checker → Read the methodology

From the database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, and the recommendation.

Substances

EGCG (Epigallocatechin Gallate) and NAC

Pair type

Caution

Evidence

Emerging

Source citations

Scope

Supplement × Supplement

Last verified

June 4, 2026

CautionEmerging evidence

What is happening. High-dose EGCG can be hepatotoxic in susceptible individuals. NAC is hepatoprotective (a glutathione precursor and the antidote for acetaminophen toxicity), so co-use is not harmful, but stacking multiple high-dose polyphenols and supplements complicates monitoring of liver-related effects.

Mechanism. EGCG-associated idiosyncratic hepatotoxicity versus NAC-mediated glutathione replenishment and antioxidant defense; opposing rather than additive hepatic effects.

Recommendation. Use sensible EGCG doses with food. NAC is not contraindicated and may even be protective; watch for signs of liver stress (nausea, dark urine, jaundice) and check liver enzymes if using high-dose EGCG long term.

Stack Score

How it moves the number.

Effect on the composite score

If both EGCG (Epigallocatechin Gallate) and NAC 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.

Sources

Sources, by evidence tier.

Every claim on this page is cited. PMIDs link straight to PubMed.

Reference material

1Mazzanti G, et al. Hepatotoxicity from green tea: a review of the literature and two unpublished cases. European Journal of Clinical Pharmacology. 2009.Needs sourceNo link

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