A new study has been published in the peer-reviewed journal Andrology, reporting on pre- and post-vaccination sperm counts and quality in 37 sperm donors in Israel. There have long been concerns about the potential for the mRNA products to have deleterious effects on male fertility, particularly after frequent reports of female menstrual irregularities, and the (now widely accepted) confirmation that the Lipid-nanoparticles become distributed around the body.