Some studies have shown coffee and other caffeinated beverages can reduce iron absorption. For example. Drinking a cup of coffee while eating a hamburger can reduce iron absorption by up to 39%. Or when you drink a cup of instant coffee with a piece of bread, it inhibits iron absorption by 60–90%.
Sascha Rohn
In coffee, many complexing agents are present. E.g. phenolic compounds such as chlorogenic acid, but also the complex dark colored melanoidins from the Maillard reaction.
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David Sturm
The caffeine itself has been shown as a chelatant of calcium in-situ of endoplasmic reticulum
https://pubmed.ncbi.nlm.nih.gov/30389846/
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