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 2 citation rows for the Fucoxanthin + Green Tea Extract pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Supplement·a caution·Emerging evidence

Fucoxanthin + Green Tea Extract

Q: Can I take Fucoxanthin and Green Tea Extract together?

Possibly, but with caution. Fucoxanthin and Green Tea Extract have a documented caution-tier interaction. Both are marketed for fat metabolism and may have additive effects on lipid oxidation and thermogenesis. The combination is not inherently harmful, but high-dose green tea extract (EGCG) carries a known risk of hepatotoxicity, and stacking multiple metabolic botanicals increases the burden on the liver.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

Caution Emerging evidence

Both are marketed for fat metabolism and may have additive effects on lipid oxidation and thermogenesis. The combination is not inherently harmful, but high-dose green tea extract (EGCG) carries a known risk of hepatotoxicity, and stacking multiple metabolic botanicals increases the burden on the liver.

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

Fucoxanthin and Green Tea Extract

Pair type

Caution

Evidence

Emerging

Source citations

Scope

Supplement × Supplement

Last verified

June 4, 2026

CautionEmerging evidence

What is happening. Both are marketed for fat metabolism and may have additive effects on lipid oxidation and thermogenesis. The combination is not inherently harmful, but high-dose green tea extract (EGCG) carries a known risk of hepatotoxicity, and stacking multiple metabolic botanicals increases the burden on the liver.

Mechanism. Potential additive metabolic effects on thermogenesis and fat oxidation; independent hepatotoxicity risk from concentrated EGCG that could compound with other hepatically processed botanicals.

Recommendation. Avoid stacking high-dose extracts and keep green tea extract within conservative EGCG limits. Anyone with liver concerns or who develops fatigue, dark urine, or jaundice should stop and seek care. Prefer taking with food.

Stack Score

How it moves the number.

Effect on the composite score

If both Fucoxanthin and Green Tea Extract 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

1Oliveira CSS, et al. Green tea extract and hepatotoxicity: a systematic review. World J Hepatol. 2019.Needs sourceNo link
2Maeda H, et al. Fucoxanthin and its metabolite fucoxanthinol in cancer prevention and treatment. Arch Biochem Biophys. 2018.Needs sourceNo link

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