McCullough referenced an article of his where he cited a study by Helene Banoun showing that lipid nanoparticles that carry the mRNA spread throughout the body and “have been shown to be able to be excreted through body fluids (sweat, sputum, breast milk) and to pass the transplacental barrier.”
...

“So, I can tell you everyone who has taken the vaccine has this material in their brain, their heart, their adrenal glands, [and] reproductive organs. It’s really a terrible thought. My heart goes out to people who have taken the vaccine,” he lamented.

https://www.lifesitenews.com/news/dr-mccullough-mrna-from-covid-vax-transfers-from-jabbed-to-unjabbed-changing-human-genome/