Copper rarely appears in popular writing alongside iron, even though the two trace elements meet at the same point in the body. Copper itself does not travel anywhere — it stays bound within an enzyme and carries out one single, clearly defined task there: it changes the charge state of iron ions before they can bind to a carrier protein in the blood.
Without this intermediate step, iron that has been absorbed or recycled would simply stay where it is. Sphaleritelle gathers the scientific background on this function and presents the EU-reviewed, authorized claim at the relevant points on this page.
Sphaleritelle describes the documented function copper performs at this point in iron handling — based on a health claim authorized by the EU.
To the GlossaryCopper's contribution can be traced through three consecutive points, regardless of whether the iron comes fresh from food or is released from the breakdown of older red blood cells.
| Enzyme Family | Belongs to the group of multicopper oxidases |
|---|---|
| Locations | Blood plasma and the membrane of small intestinal cells |
| Shared Metal | Copper, bound in the active site |
| Catalyzed Step | Release of an electron to oxygen, change in charge at iron |
“Copper contributes to normal iron transport in the body”
EU-authorized wording · Regulation (EU) No 432/2012
What stands out about this claim is that it is not limited to a single organ. The change in charge it describes takes place at two physically separate locations in the body, which nonetheless work according to the same basic chemical principle.
A soluble enzyme circulates in the blood plasma, carrying its copper tightly bound, and carries out the change in charge where iron moves from storage organs back into the blood. At the wall of the small intestine, a related, membrane-anchored enzyme sits in immediate proximity to the export protein ferroportin — so that iron is converted right after leaving the cell, before it can be lost into the surrounding tissue.
The authorized claim describes a physiologically ordinary process and assumes a copper intake that already covers requirements. It makes no statement about an existing iron shortfall and cannot take over the job of a medical blood test. Anyone who wants an assessment of their own iron or copper status should consult medical professionals.
Beyond the claim addressed here, copper has additional, independently reviewed claims for other body functions that this page does not go into. The wording quoted above refers solely to copper’s contribution to normal iron transport in the body — not to iron itself, which has its own separately reviewed claims.
Four chapters on the enzyme chemistry behind the copper claim, with a source table and a reference glossary section.
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