Frequently there is some banter about the risk associated with adjuvants by people who consider vaccines more dangerous than beneficial. If a given vaccine lists an adjuvant that is toxic in isolation, how can I find out if it is inert or otherwise harmless in the overall composition of the vaccine?
The important principle of toxicology here is
The dose makes the poison
You have to find out the quantity of the adjuvant to compare it to known safety data. You can check Material safetey data sheets (MSDS) for those substances, or directly search for safety studies about those substances, e.g. on Pubmed.
The quantity of most additives in vaccines is very small, far below dangerous amounts.