Many of the things about which people wrote were untrue. The vaccines don’t alter your DNA, of course; they don’t get near it. That’s the advantage of mRNA. Occasionally, though, I’d see falsehoods that were based on a grain of truth. For example, anything that elicits an immune activation can temporarily change a menstrual cycle. When the first vaccines were used one hundred years ago, this phenomenon was also observed and published. The changes are temporary, a sign of your immune system at work. They aren’t dangerous, and before long, everything returns to normal.
