Not everyone diagnosed with “iron deficiency” actually needs more iron but that doesn’t mean copper is the answer for everyone either. Here’s the real biology. Copper plays a critical role in iron metabolism. It’s required for enzymes like ceruloplasmin and hephaestin, which help move iron out of storage (liver, macrophages) and into the bloodstream so it can be used to make red blood cells. When copper is deficient, iron can become trapped in storage, leading to low circulating iron despite nor