Green Tea Extract & Iron

Warning Absorption Warning Timing
Green Tea Extract → Iron →
Warning Absorption

Green tea catechins (EGCG) significantly reduce non-heme iron absorption.

Mechanism

EGCG chelates non-heme iron in the gut, making it unavailable for absorption. Can reduce iron absorption by 25-60%.

Recommendation

Separate green tea extract and iron supplements by at least 2 hours. Take iron on an empty stomach with vitamin C.

Sources

Warning Timing

Take green tea extract and iron supplements at least 2 hours apart.

Mechanism

EGCG in green tea extract chelates iron and reduces absorption by up to 60%. Additionally, very high-dose EGCG on an empty stomach may stress the liver.

Recommendation

Always separate green tea extract from iron by at least 2 hours. Take green tea extract with food to reduce liver stress.

Sources

Drug interaction context

Known drug category interactions for these supplements. Especially relevant if you take prescription medications.

Warning Iron × Thyroid medication (levothyroxine)

Iron reduces levothyroxine absorption.

Take levothyroxine at least 4 hours before or after iron supplements.

Check your full stack including medications →

Tolerable upper intake limits

Reference values for safe daily intake of these supplements.

Iron
45.000 mg
adults NIH ODS / IOM

GI distress above UL. Risk of iron overload in people with hemochromatosis.

All interactions Check your stack
© 2026 Noyemi. All rights reserved. Privacy · Terms
Medical Disclaimer: Noyemi provides information from published research for educational purposes only. This content is not medical advice and does not replace consultation with a qualified healthcare provider. Always consult your doctor before starting, stopping, or changing any supplement regimen, especially if you take medications or have existing health conditions.