Essential minerals and their role in optimizing immune function: insights into deficiencies and supplementation

Minerals play a vital role in supporting both innate and adaptive immune systems, impacting how the body responds to infections and maintains long-term inflammatory regulation. Deficiencies in minerals such as magnesium, zinc, copper, iron, and selenium can impair immune competence and disrupt systemic inflammation balance. While a well-balanced diet generally supplies sufficient minerals, vulnerable populations—such as the elderly, individuals with chronic conditions, vegetarians, vegans, and pregnant women—are at higher risk of deficiencies. This review emphasizes the importance of maintaining an adequate intake of these minerals and explores the potential need for supplementation under certain conditions.

Magnesium, for instance, is integral to cellular signaling, membrane function, and the regulation of acute and chronic inflammation. Zinc, another key mineral, is crucial for both the innate and adaptive immune responses, influencing functions such as cytokine regulation and immune cell activation. Copper, though less discussed, is essential for neutrophil and macrophage function and contributes to the defense against bacterial infections. Iron plays a dual role, supporting red blood cell production while also regulating macrophage-mediated immune responses, particularly in iron-deficient or overloaded conditions.

However, excessive supplementation of these minerals can lead to adverse effects, including immune dysfunction, oxidative stress, and disruptions in inflammatory regulation. Therefore, medical oversight is recommended when considering mineral supplementation. By balancing these essential nutrients, individuals can better support their immune health and mitigate the risks associated with both deficiencies and over-supplementation.