I have a background in chemistry. Early in the pandemic when all the anti-vax nonsense was at its peak I took a look at the ingredients in the three main vaccines in Canada (A-Z, M, and P). For the most part they all included:
mRNA which we all have in our bodies all the time
4 salts of which one was table salt
4 fats of which one was cholesterol
and sugar.
That's it.