https://jbhandleyblog.com/home/2018/4/1/international2018 Aluminum is added to vaccines to antagonize the immune system, provoking it to recognize the antigen in vaccines. However, it also causes an immune response and some degree of inflammation that could alter a developing brain. Some believe there is a connection, and that could be a cause of autism. Previous concerns surrounding vaccines were more focused on mercury content.
Yes, but in these type of cases there are huge differences between ingesting it and it going directly into the bloodstream. (One example is potassium salts, perfectly fine to eat, but if they go directly in into the bloodstream it's extremely painful and you can easily die)
