NSTK · 01.2026Independent supplement reference
NutriStack
Edition 1.0Updated August 1, 2026

Supplement × Supplement·Evidence index

EGCG (Epigallocatechin Gallate) and NAC: what the published research says

PubMed indexes 7 records that name EGCG (Epigallocatechin Gallate) and NAC together, either in the title or in an interaction, co-administration, or pharmacokinetic context. Each one is listed below with its study design and, where the abstract states one, the authors’ own conclusion, quoted and linked. This page reports that literature. It does not tell you whether to combine them.

Read this first

An evidence index, not guidance.

Every statement below is attributed to a named, dated, linked source.

This page lists published research relevant to EGCG (Epigallocatechin Gallate) and NAC. It deliberately does not state whether the combination is safe, whether it interacts, in which direction, at what dose, or how far apart to take them.

The research

7 studies naming EGCG (Epigallocatechin Gallate) and NAC.

Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.

The use of comet assay data with a simple reaction mechanism to evaluate the relative effectiveness of free radical scavenging by quercetin, epigallocatechin gallate and N-acetylcysteine in UV-irradiated MRC5 lung fibroblasts.

Journal of photochemistry and photobiology. B, Biology · 2004 · PMID 15246351

Comparative StudyHuman subjects

“All three compounds demonstrate a concentration dependent reduction maximum with a pro-oxidant effect at higher (though not cytotoxic) concentrations. Manipulation of a simple 4-step reaction mechanism for free radical (FR) scavenging by AOs produced rate constant ratios which allowed the relative effectiveness (Q > EGCG > NAC) of the AOs to be evaluated.”

Salter et al. · From the abstract

Names both EGCG (Epigallocatechin Gallate) and NAC in its title.

The effects of N-acetylcysteine and epigallocatechin-3-gallate on liver tissue protein oxidation and antioxidant enzyme levels after the exposure to radiofrequency radiation.

International journal of radiation biology · 2015 · PMID 25249432

Animal study

“Significant decreases in the activities of SOD were observed in the liver of guinea pigs after RFR exposure. Protein damage did not change due to RFR exposure. On the other hand, only NAC treatment induced increased PCO levels, whereas EGCG treatment alone elevated the level of AOPP. Due to antioxidants having pro-oxidant behavior, the well decided doses and treatment timetables of NAC and ECGC are needed.”

Ozgur et al. · Authors' conclusion

Names both EGCG (Epigallocatechin Gallate) and NAC in its title.

Changes in skeletal muscle proteolytic gene expression after prophylactic supplementation of EGCG and NAC and eccentric damage.

Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association · 2013 · PMID 23376779

Human subjects

“Prophylactic supplementation of NAC and EGCG did not impact acute changes in skeletal muscle proteolytic gene expression following eccentric exercise. Eccentric muscle contractions elevated MuRF1 and UBE3B, while m-calpain and HC2 mRNA tended to increase.”

Kerksick et al. · Authors' conclusion

Names both EGCG (Epigallocatechin Gallate) and NAC in its title.

Mobile phone radiation-induced free radical damage in the liver is inhibited by the antioxidants N-acetyl cysteine and epigallocatechin-gallate.

International journal of radiation biology · 2010 · PMID 20807176

Animal study

“Mobile phone-like radiation induces oxidative damage and changes the activities of antioxidant enzymes in the liver. The adverse effect of RFR may be related to the duration of mobile phone use. NAC and EGCG protect the liver tissue against the RFR-induced oxidative damage and enhance antioxidant enzyme activities.”

Ozgur et al. · Authors' conclusion

Names both EGCG (Epigallocatechin Gallate) and NAC in its title.

N-Acetylcysteine enhances the lung cancer inhibitory effect of epigallocatechin-3-gallate and forms a new adduct.

Free radical biology & medicine · 2008 · PMID 18206665

Research Support, N.I.H., ExtramuralHuman subjects

“This adduct was not formed in the absence of NAC. The present results show that under cell culture conditions, EGCG and NAC interact to form a previously unreported adduct, EGCG-2'-NAC, which may contribute to enhancement of EGCG-mediated cell killing.”

Lambert et al. · From the abstract

Names both EGCG (Epigallocatechin Gallate) and NAC in its title.

Effect of nutrient mixture and black grapes on the pharmacokinetics of orally administered (-)epigallocatechin-3-gallate from green tea extract: a human study.

Phytotherapy research : PTR · 2008 · PMID 18446840

Clinical Trial

“The pharmacokinetic parameters were analysed by WinNonLin (Vs 5.0.1.) using a non-compartmental approach. Supplementation with nutrient mixture normally prescribed to cancer patients containing ascorbic acid, selenium, N-acetyl cysteine and other nutrients (formulation B) resulted in an increase of the systemic availability of EGCG by 14% and formulation C further increased it by 13%, thus leading to a total increase of 27%.”

Gawande et al. · From the abstract

Names EGCG (Epigallocatechin Gallate) and NAC together in an interaction, co-administration, or pharmacokinetic context.

Limitations

What this evidence cannot tell you.

Search-based evidence indexes have real limits, and it is worth being explicit about them:

NutriStack

Track what you actually take.

NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers EGCG (Epigallocatechin Gallate), NAC, and several hundred other substances.

The checker is a research and organisation tool, not a clinical decision aid, and its per-pair assessments are excluded from search until they pass claim-level review.

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.