Vials of donor sperm frozen by liquid nitrogen Ted Soqui/Corbis via Getty Images
A 16-year study of US sperm donors shows that sperm quality has been steadily declining, possibly due to increased chemical exposure and lifestyle changes.
at Reproductive Medicine Associates of New York, a fertility clinic, and her colleagues looked at more than 170,000 semen analyses conducted between 2005 and 2021 for healthy 19 to 38-year-olds from nine geographic regions across the US. The researchers say the data comes from a “diverse set” of men, although it is unclear how representative it is of the US…
