PEG is highly correlated with neurological issues like tics and ocd in children prescribed it long term for constipation. The pharma co tells the pediatricians that the little balls of plastic stay in the digestive tract from mouth to anus and have no way of getting into the bloodstream or brain. That is a lie. Doctors pass on to their patients’ parents this lie.
If you have a specific concern about PEG, you should probably avoid the Moderna and Pfizer vaccines and look more at J&J or Novavax (which isn’t yet authorized, but likely will be by May).