“aborted human fetal tissue is used to produce it”
https://www.ncbcenter.org/resources/frequently-asked-questions/use-vaccines/
“What does it mean when we say that these products are made in “descendent cells”?
Descendent cells are the medium in which these vaccines are prepared. The cell lines under consideration were begun using cells taken from one or more fetuses aborted almost 40 years ago. Since that time the cell lines have grown independently. It is important to note that descendent cells are not the cells of the aborted child. They never, themselves, formed a part of the victim’s body.”
There are alternatives nowadays that don’t involve the use of human fetal cells, for most pathogens.
FD: I don’t worry about the origins of my vaccines, but some folks are more conscientious than I am.