Can You Take Iron With Coffee or Tea?
Last updated: August 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
You can, but you will absorb considerably less. Polyphenols in coffee and tea bind non-haem iron in the gut and substantially reduce absorption — tea more than coffee. Separate them by an hour or two, and take iron with vitamin C instead.
Key takeaways
- Tea and coffee polyphenols bind iron and cut absorption substantially.
- Separate by one to two hours; take iron with vitamin C instead.
- Calcium and dairy have the same blocking effect.
What the polyphenols do
Tannins and other polyphenols in tea, coffee, red wine and cocoa form insoluble complexes with non-haem iron in the intestine, preventing absorption. Studies have measured substantial reductions when tea is consumed with an iron-containing meal, with black tea among the strongest inhibitors. Haem iron from meat is much less affected.
What to pair it with instead
Vitamin C reduces ferric iron to the more absorbable ferrous form and forms a soluble complex that resists binding by inhibitors. Around 100–200 mg alongside the iron is enough. Orange juice with an iron supplement is the simple version of this.
The other inhibitors worth knowing
Calcium and dairy reduce iron absorption — separate by two hours. Proton pump inhibitors and antacids reduce it by raising gastric pH. Phytates in whole grains and legumes bind iron, which is part of why plant-based diets need attention to iron. Zinc and iron also compete when taken together at high doses.
Key ingredients to understand
The ingredients most relevant to this question, with what the evidence actually supports:
- Iron Bisglycinate — Iron bisglycinate is chelated iron with markedly better tolerability than ferrous sulphate — far less constipation and nausea — at comparable…
- Ferrous Sulfate — Ferrous sulphate is the cheapest and most-studied iron supplement and the standard first-line treatment for iron deficiency anaemia. It also…
- Vitamin C — Vitamin C is an essential antioxidant nutrient needed for immunity, collagen and iron absorption. For colds, regular intake may slightly shorten…
- Calcium Citrate — Calcium citrate absorbs without stomach acid, which makes it the right choice for older adults, anyone on a proton pump inhibitor, and anyone…
Frequently asked questions
How long should I wait?
One to two hours either side is the usual advice.
Does it apply to herbal tea?
Less so — the effect is driven by polyphenol content, and black and green tea are the highest.
What if I always have coffee at breakfast?
Take the iron mid-morning or at bedtime instead. Bedtime works well if it does not upset your stomach.
Related on FactoWiki
- All health answers
- Ingredient evidence guides
- Iron Bisglycinate — ingredient guide
- Ferrous Sulfate — ingredient guide
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