Zinc supplementation has become ubiquitous in clinical practice and consumer health markets, yet a critical oversight persists: the absence of copper in most formulations. Recent evidence highlights a paradoxical phenomenon where excessive zinc intake actively suppresses copper absorption through competitive inhibition at the intestinal transporter level. Both minerals depend on the same metallothionein-mediated transport mechanism, meaning high zinc doses create a functional bottleneck that forces copper excretion rather than absorption. The clinical consequences are significant, ranging from fatigue and anaemia to leukopenia and neurological complications. Medical professionals and supplement manufacturers increasingly recognise that dosing zinc without concurrent copper supplementation represents a gap in evidence-based formulation. The recommended supplemental ratio—15 to 30 mg zinc paired with 1 mg copper daily—remains absent from many commercial products, leaving users vulnerable to iatrogenic mineral deficiency despite adequate dietary copper intake.
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