Copper for Immune Function

Research suggests that copper plays a meaningful role in supporting immune function, with deficiency linked to impairments across both the innate and adaptive branches of the immune system, including reduced antioxidant capacity, elevated inflammatory markers, and greater susceptibility to infection. Studies indicate that these effects appear to be reversible with timely correction of deficiency, as demonstrated in animal research showing that copper restoration largely normalized immune and oxidative stress markers in the spleen. The available evidence comes primarily from reviews and animal studies rather than large human clinical trials, and several reviews note that a balanced diet generally provides sufficient copper for most people, with supplementation recommended only when a confirmed deficiency exists, as excessive intake may itself be harmful. Findings are further complicated by copper's interactions with other nutrients, particularly zinc, where high zinc intake has been shown to interfere with copper absorption and contribute to copper-deficiency-related immune impairments, underscoring that these micronutrients are best understood in the context of overall nutritional balance rather than in isolation.