Iron & Zinc

Caution Absorption
Iron → Zinc →
Caution Absorption

Iron and zinc compete for absorption when taken together in supplement form.

Mechanism

Both minerals use the DMT1 transporter for absorption.

Recommendation

Take iron and zinc supplements at different times of day.

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.

Zinc
40.000 mg
adults NIH ODS / IOM

Chronic high intake can cause copper deficiency and immune dysfunction.

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
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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.