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Do Whole Grains and Beans Block Iron?
Phytate in grains and beans lowers non-heme iron absorption, but in a typical western diet the effect matters little for most people’s iron status.[1]
Based on NIH Office of Dietary Supplements — Iron fact sheet · Updated October 10, 2026
Phytate in grains and beans lowers non-heme iron absorption[1]
Phytate, present in grains and beans, lowers non-heme iron absorption; vitamin C in the same meal works the other way.
Vitamin C in the same meal helps; in a typical western diet these effects have little effect on most people's iron status.
Source [1]Iron: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. (ods.od.nih.gov)
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- Do Iron and Manganese Compete?They are linked: iron deficiency raises manganese absorption and can make manganese toxicity worse.
- Does Vitamin A Help Iron?Vitamin A is needed to mobilise iron, so if iron and vitamin A are both short, address both.
- Does Riboflavin (Vitamin B2) Help Iron?Riboflavin is needed to use iron, so check riboflavin sources such as dairy, eggs and fortified grains when iron is short.
- Do Coffee and Tea Block Iron Absorption?Coffee and tea can inhibit iron absorption: in a study in adults, coffee and tea drunk with a bread meal cut the iron absorbed from it.
- Does Soy Affect Iron Absorption?Soy protein lowers non-heme iron absorption, largely because of its phytate.
- Do Iron and Copper Work Together?Yes. Copper takes part in iron metabolism, and anemia is one effect of copper deficiency, which is uncommon.
Sources
- Iron: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. ods.od.nih.gov
This page is general information from the cited sources, not medical advice. If you take prescription medication, are pregnant, or manage a health condition, check supplement changes with a pharmacist or doctor.