In addition to weakened or killed disease antigens (viruses or bacteria), vaccines contain very small amounts of other ingredients – excipients.
The following table lists substances, other than active ingredients (i.e., antigens), shown in the manufacturers’ package insert (PI)
as being contained in the final formulation of each vaccine.
https://www.cdc.gov/vaccines/pubs/pinkbook/downloads/appendices/b/excipient-table-2.pdf