I am just curious about vaccine ingredients and whether you would give them to your children in their food, for example.
Be more specific, please. What "vaccine ingredients" are we talking about, and in what quantity are they delivered via vaccine vs. their typical daily intake?
Most often, there's some hype about one or another aluminum compound used as an adjuvant in vaccines. Last time I checked, a typical dose of a vaccine contained about ~1/10 of what a typical human adult digested of that stuff, daily, anyway.
Combine this with the fact that most vaccines happen once or twice in a lifetime, and others perhaps once in a decade. Subtract a bit to account for the fact that children aren't adults, and the result will still be that this doesn't matter at all, in the grand scheme of things.
Would I want my kid to constantly lick the aluminum lid of a microwave dish that has been in contact with acids and salt for a lengthy amount of time? Hell no! Does it matter if my kid does this once at the age of three and then never again in their live? Most likely not! Would I actually ask my kid to lick the lid once in their life if it also increased their health in other, otherwise unrelated aspects? You bet I would!