Aluminium is a major component of most clays = in most water = evolutionarily harmless - unless you have a crooked legal system abetted by RFK Jr - who is probably killing many children via his position!
Aluminum is part of natural materials, but I see no evidence that it naturally gets into a human's blood in similar levels to injected aluminum from vaccines. See my reply to the "10X more aluminum in a muffin than a vaccine" comment on this page.
(disclaimer - not anti-vax, just addressing a simplistic argument that didn't hold up to scrutiny)
Although aluminum at high doses can cause a variety of clinical manifestations, the quantity of aluminum in vaccines is too small to cause a direct toxic effect. Indeed, the quantity of aluminum in biological specimens from those receiving aluminum-containing vaccines is indistinguishable from unvaccinated subjects. The concern that aluminum in vaccines might be associated with a rare autoimmune disease called macrophagic myofasciitis has been refuted by previous studies.
These grifters take something that sounds bad but out of context, make way too big a deal about it, then turn around and sell you supplements to fix the problems. I have no idea why anyone trusts them but it seems to work
I was wondering about this myself since I saw Milo Rossi's intense takedown of Shayne Truth Vibes, another anti-vaxxer and overall conspiracy theorist https://youtu.be/-gxg7l_Hxa0?feature=shared. He's explained it as predatory behaviour that feeds fears to promote whatever it is they are peddling as the one and only solution to these fears.