Zinc supplementation efficacy
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Zinc Supplementation Efficacy: Antioxidant Defense and Immune Function
Zinc supplementation has been shown to significantly improve certain aspects of the antioxidant defense system. Specifically, it increases glutathione (GSH) and total antioxidant capacity (TAC) levels, and, after adjusting for publication bias, enhances superoxide dismutase (SOD) activity. However, it does not have a significant effect on glutathione peroxidase (GPx) activity . In elderly populations with low serum zinc, supplementation effectively raises serum zinc concentrations and enhances T cell proliferation, mainly by increasing the number of T cells, which suggests improved immune function .
Zinc Supplementation for Glycemic Control and Obesity
Multiple meta-analyses and clinical trials indicate that zinc supplementation can significantly improve glycemic control in individuals with type 2 diabetes and those who are overweight or obese. Zinc reduces fasting glucose, 2-hour postprandial glucose, fasting insulin, insulin resistance (HOMA-IR), and glycated hemoglobin (HbA1c) Yang2023Wang2019Ghaedi2023. It also improves lipid profiles, reduces inflammatory markers like C-reactive protein, and supports weight management when combined with a calorie-restricted diet Khorsandi2019Ghaedi2023. The benefits are especially pronounced in diabetic patients and with higher doses of zinc Yang2023Wang2019Ghaedi2023.
Zinc Supplementation and Acute Diarrhea in Children
In children over 11 months old, especially those with low plasma zinc levels, daily zinc supplementation significantly reduces both the incidence and prevalence of acute diarrhea. The effect is more pronounced in boys, but girls also benefit. Children with lower baseline zinc levels experience the greatest reduction in diarrheal episodes .
Zinc Supplementation for Depression
Evidence from randomized controlled trials suggests that zinc supplementation, particularly when used alongside antidepressant medications, can reduce depressive symptoms in individuals with clinical depression Lai2011Da Silva2020. The effect is more notable in adults over 40 years old. However, the evidence for zinc supplementation alone in non-depressed individuals is less clear, and more high-quality research is needed Lai2011Da Silva2020.
Zinc Supplementation for Primary Dysmenorrhea
Zinc supplementation is effective in reducing pain severity in women with primary dysmenorrhea. Even low doses (as little as 7 mg/day) provide significant pain relief, and longer treatment durations (at least 8 weeks) enhance the effect. Zinc is well-tolerated, with adverse event rates similar to placebo .
Conclusion
Zinc supplementation demonstrates clear efficacy in several health domains: it enhances antioxidant defenses, improves immune function in the elderly, supports glycemic control and weight management in diabetes and obesity, reduces acute diarrhea in zinc-deficient children, alleviates depressive symptoms when combined with antidepressants, and relieves pain in primary dysmenorrhea. The benefits are most pronounced in populations with low baseline zinc levels or specific health conditions, and zinc is generally well-tolerated across studies.
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