NutriStack
Green Tea Extract and Iron, a conflict.
Green tea catechins, particularly EGCG, bind non-heme iron in the gut, reducing absorption by up to 60-70%. This is one of the most potent dietary inhibitors of iron absorption.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Green Tea Extract and Iron
- Pair type
- Conflict
- Evidence (highest tier)
- Strong
- Source citations
- 1 source
- Stack Score effect
- −10 to your Stack Score (per scored conflict row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Conflict · Strong evidence
Conflict
What is happening. Green tea catechins, particularly EGCG, bind non-heme iron in the gut, reducing absorption by up to 60-70%. This is one of the most potent dietary inhibitors of iron absorption.
Mechanism. EGCG and other catechins chelate ferric iron (Fe3+) in the intestinal lumen, forming insoluble iron-polyphenol complexes that cannot be absorbed by DMT1.
Recommendation. Separate iron supplements and green tea/green tea extract by at least 2 hours. Take iron in the morning on an empty stomach, green tea later in the day.
Minimum separation. 120
Stack Score
How this pair moves the number.
Effect on the composite score
If both Green Tea Extract and Iron are in the same stack, this pair applies −10 to your Stack Score (per scored conflict row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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