Zinc supplementation in men
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Zinc Supplementation and Male Fertility
Zinc Supplementation and Sperm Quality in Men
Research shows mixed results regarding the impact of zinc supplementation on male fertility. Several studies and reviews indicate that zinc supplementation can improve sperm parameters such as concentration, morphology, and DNA integrity, especially in men with infertility or underlying conditions like diabetes. These improvements are often attributed to zinc's antioxidant properties, which help protect sperm from oxidative damage and improve DNA integrity, potentially increasing fertilization capacity 278. However, some large-scale clinical trials and studies in men with specific conditions, such as isolated hypogonadotropic hypogonadism, found that adding zinc to standard treatments did not significantly enhance spermatogenesis or sperm quality compared to standard therapy alone 13.
Zinc, Testosterone, and Hormonal Balance
Zinc plays a key role in hormone regulation, particularly testosterone. Evidence suggests that zinc deficiency can lower testosterone levels, while supplementation can help restore or improve these levels. The degree of benefit may depend on baseline zinc and testosterone status, the form and dose of zinc, and the duration of supplementation. Moderate zinc supplementation is generally considered beneficial for maintaining healthy androgen levels in men .
Zinc Supplementation and Immune Function
Supplementing with zinc can also affect immune system function. Studies show that even modest zinc supplementation can increase the expression of genes related to immune response in white blood cells, potentially enhancing the body's ability to respond to infections and inflammation .
Zinc and Prostate Health
The relationship between zinc supplementation and prostate cancer risk is complex. Long-term or high-dose zinc supplementation (over 75 mg per day or for more than 15 years) has been associated with an increased risk of aggressive and lethal prostate cancer . However, among men already diagnosed with nonmetastatic prostate cancer, low-dose zinc supplementation (1–24 mg per day) after diagnosis was linked to a lower risk of lethal prostate cancer and reduced all-cause mortality, while higher doses did not show this benefit . This suggests that moderation in zinc supplementation is important for prostate health.
Zinc and Bone Health in Men
Zinc supplementation at higher-than-normal doses has been shown to increase markers of bone formation in healthy men, though it does not appear to affect bone resorption. This suggests a potential benefit for bone health, but more research is needed to confirm these effects in broader populations .
Conclusion
Zinc supplementation in men can offer benefits for sperm quality, testosterone levels, immune function, and possibly bone health, particularly in those with deficiencies or specific health conditions. However, the benefits for fertility and live birth rates are not consistently supported by large clinical trials, and excessive or long-term high-dose supplementation may increase the risk of aggressive prostate cancer. Moderate zinc supplementation appears safe and potentially beneficial, but men should avoid excessive doses and consult healthcare providers for personalized advice.
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Most relevant research papers on this topic
The effectiveness of zinc supplementation in men with isolated hypogonadotropic hypogonadism
Oral zinc supplementation with sequential uFSH/hCG treatment is a subtle improvement in spermatogenesis and masculinization in males with isolated hypogonadotropic hypogonadism.
Effect of Folic Acid and Zinc Supplementation in Men on Semen Quality and Live Birth Among Couples Undergoing Infertility Treatment: A Randomized Clinical Trial.
Daily folic acid and zinc supplementation in men does not significantly improve semen quality or live birth rates in couples undergoing infertility treatment.
Correlation between serum zinc and testosterone: A systematic review.
Serum zinc is positively correlated with testosterone levels, and moderate zinc supplementation improves testosterone levels, with effects varying based on basal zinc and testosterone levels.
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Zinc supplementation of young men alters metallothionein, zinc transporter, and cytokine gene expression in leukocyte populations.
Zinc supplementation in young men alters metallothionein, zinc transporter, and cytokine gene expression in leukocyte populations, potentially enhancing immune response.
The effect of zinc supplementation on improving sperm parameters in infertile diabetic men
Zinc supplementation can improve sperm parameters, sperm chromatin, and DNA integrity in infertile diabetic men, potentially acting as a supportive compound in their diet.
Zinc supplementation increases bone alkaline phosphatase in healthy men.
Zinc supplementation at supraphysiological doses increased bone formation parameters in healthy men without significantly affecting bone resorption.
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