Many couples in contemporary societies suffer from infertility of unexplained origins (idiopathic). A promising treatment strategy within this context involves the administration to women of preparations containing lactic acid bacteria () and/or their metabolites. Recent investigations underscore the role of lactobacilli in sustaining female fertility and enhancing the effectiveness of assisted reproductive techniques. There have also been reports describing the effect of lactobacilli on sperm functions, but our knowledge in this domain remains uncertain. In this study, the effect of supernatant from culture on mouse sperm viability and motility was tested. The protective properties of lactobacilli metabolites against hydrogen peroxide-induced DNA damage were also verified. It was shown that the metabolites have no effect on viability, motility, and genome integrity of spermatozoa, but in excessive concentrations they become toxic. The obtained results imply that probiotic and/or postbiotic preparations taken by women should not adversely affect the sperm of their partners, provided the dose is correctly selected.
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