Are you wondering if the fact that vaccines are injected not ingested (eaten) makes a difference to their ingredients and their safety?
Just because something is injected but this does not make it dangerous. Yes, the routes are different, and substances are handled in different ways by the body depending on how they enter it, but whichever route the vaccines enter the body, all the vaccine ingredients are safe in the very very tiny amounts they are given in. For a great explanation please see here.
Page reviewed June 2016.