An Israeli study recently published in the scientific journal Andrology found a 15% decrease in sperm concentration three months after mRNA covid vaccination. The authors argued the decrease was temporary, but the data didn’t actually show a recovery, just a wider confidence interval. However, the study was very small (just 37 participants), it had no control group (to exclude external effects), and several other studies found no such decrease in sperm concentration – some even found a supposed increase, highlighting that such measurements can be quite complex. Thus, contrary to claims by some covid vaccine skeptics, the recent Israeli study...