Unveiling the micronutrient‐immunity puzzle in inactivated COVID‐19 vaccination: A comprehensive analysis of circulating micronutrient levels and humoral responses in healthy adults

While micronutrients are crucial for immune function, their impact on humoral responses to inactivated COVID‐19 vaccination remains unclear. We investigated the associations between seven key micronutrients and antibody responses in 44 healthy adults with two doses of an inactivated COVID‐19 vaccine. Blood samples were collected pre‐vaccination and 28 days post‐booster. We measured circulating minerals (iron, zinc, copper, and selenium) and vitamins (A, D, and E) concentrations alongside antibody responses and assessed their associations using linear regression analyses. Our analysis revealed inverse associations between blood iron and zinc concentrations and anti‐SARS‐CoV‐2 IgM antibody binding affinity (AUC for iron: β = −258.21, p