Iron Absorption Inhibition by Matcha Green Tea

Mechanism and Clinical Significance

The American Gastroenterological Association suggests that for individuals at risk of iron deficiency, consuming matcha between meals rather than during meals can significantly reduce its inhibitory effect on iron absorption 1

The National Institute of Diabetes and Digestive and Kidney Diseases recommends that taking iron supplements or consuming iron-rich foods with vitamin C (ascorbic acid) can significantly improve iron absorption, even in the presence of inhibitors 2, 1
Consuming as little as 80 mg of ascorbic acid with iron on an empty stomach can enhance iron absorption 2
The American College of Gastroenterology suggests that for those concerned about iron status, consuming iron with meat protein will improve absorption, and 500 mg of vitamin C allows iron absorption even when calcium or fiber is present in the meal 2

The European Association for the Study of the Liver recommends that individuals with hemochromatosis (iron overload) should leverage the iron-inhibiting properties of tea, as it can help reduce iron absorption 3, 1
The Academy of Nutrition and Dietetics suggests that those following plant-based diets should be particularly mindful of this interaction, as they rely more heavily on non-heme iron, which is more susceptible to inhibition by tea compounds 1

The American Heart Association recommends pairing iron-rich foods with vitamin C sources to counteract the inhibitory effects of tea polyphenols 2, 1
The National Institutes of Health suggests that coffee similarly inhibits iron absorption and should not be consumed within an hour of taking iron supplements or iron-rich meals 2, 1