Diabetes mellitus, particularly type 2, is associated with immune dysfunction and zinc deficiency, which exacerbate inflammation and impair glycemic control. This study solely investigated the post-immune response to zinc supplementation in 315 diabetic patients with immune dysfunction within Jaba Local Government Area (LGA), Kaduna State, Nigeria. In a randomized controlled trial, participants received either 30mg/day elemental zinc or placebo for 12 weeks. Immune markers (CD4+ T-cell counts, TNF-α, IL-6) and glycemic indices (fasting blood glucose [FBS], HbA1c) were assessed before and after intervention. Results showed significant improvements in the zinc group: CD4+ counts increased by 25% (p<0.001), TNF-α decreased by 32% (p<0.01), IL-6 by 28% (p<0.05), FBS by 18% (p<0.001), and HbA1c by 1.2% (p<0.001). No significant changes was observed in the placebo group. Zinc supplementation enhances the immune function and glycemic control in this population, supporting its role as an adjunct therapy in resource-limited settings.