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Does zinc make men more fertile?

nih.gov - Zinc, folic acid supplement does not improve male fertility, NIH study ...

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Zinc, folic acid supplement does not improve male fertility, NIH study suggests

Dietary supplements containing zinc and folic acid — marketed as a treatment for male infertility — do not appear to improve pregnancy rates, sperm counts or sperm function, according to a study conducted by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), part of the National Institutes of Health. The study appears in the Journal of the American Medical Association. The authors note that most so-called fertility supplements contain zinc and folic acid. Zinc is an essential mineral for sperm formation, and folate, the natural form of folic acid, depends on zinc to help form DNA in the sperm. Previous studies of these nutrients as a treatment for male infertility have produced conflicting results. In the current trial, researchers enrolled 2,370 couples planning infertility treatments in four U.S. cities and their surrounding areas. The men were assigned at random to receive either a placebo or a daily supplement containing 5 milligrams of folic acid and 30 milligrams of zinc. Live births did not differ significantly among the two groups: 404 (34%) in the supplement group and 416 (35%) in the placebo group. Similarly, the groups did not differ among various measures for sperm health, such as sperm movement, shape and total count. However, the proportion of sperm DNA fragmentation—broken DNA in the sperm—was higher in the supplement group (29.7%), compared to the placebo group (27.2%). Studies have linked a high rate of sperm DNA fragmentation to infertility. Men in the supplement group also had a higher proportion of gastrointestinal symptoms, compared to the placebo group: abdominal discomfort (6% vs. 3%), nausea (4% vs. 2%) and vomiting (3% vs. 1%). “Our study is one of the first randomized, placebo-controlled trials to assess whether folic acid and zinc supplements help to improve male fertility,” said Enrique Schisterman, Ph.D., of the NICHD Division of Intramural Population Health Research, who conducted the trial, along with colleagues. “Our results suggest that these dietary supplements have little to no effect on fertility and may even cause mild gastrointestinal symptoms.” About the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD): NICHD leads research and training to understand human development, improve reproductive health, enhance the lives of children and adolescents, and optimize abilities for all. For more information, visit https://www.nichd.nih.gov. About the National Institutes of Health (NIH): NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov.

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webmd.com - Foods High in Zinc for Vegans and Vegetarians - WebMD

Zinc is an essential mineral that plays an important role in many processes throughout your body. It keeps your immune system healthy, aids in wound-healing, and helps keep your senses of smell and taste sharp. The mineral is especially vital during pregnancy, infancy, and childhood for proper growth and development. The best sources of zinc are meat and dairy. This means if you’re a vegetarian and don’t eat meat, or vegan and don’t eat any animal products, you may not be getting enough zinc in your diet. A majority of multivitamins contain zinc; you can also take a zinc supplement. But there are several plant sources of zinc, too, which help vegans and vegetarians meet their recommended daily intake. It’s important to note, though, that some of these plant foods contain phytates, which may bind to zinc, preventing proper absorption. Getting enough zinc as a vegan or vegetarian helps your body fight off bacteria and viruses, heal from injuries, and more.

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