What role does Zink play in fertility?

Zinc is an essential trace element that plays a key role in numerous enzymatic processes, including those related to fertility. In men, zinc is critical for spermatogenesis, sperm motility, and protecting sperm DNA from oxidative stress. Zinc deficiency can lower testosterone levels and impair sperm quality. In women, zinc supports follicle maturation, ovulation, and early embryonic development. However, the evidence for a direct causal effect of zinc supplementation on fertility in healthy, replete individuals is limited. Most clinical benefits are seen in cases of confirmed deficiency or specific subgroups (e.g., men with oligospermia). Consumer DNA tests that claim to assess 'zinc-related genes' cannot diagnose current zinc status or reliably predict fertility outcomes. A blood test (serum zinc) is far more accurate. Excessive zinc intake can be toxic and interfere with copper absorption, so supplementation should only be taken under medical supervision. Overall, the evidence for zinc's role in fertility is moderate and highly dependent on individual baseline status.