evidence: 2. Peanut oil is used in vaccines in adjuvants or as a vaccine carrier. The ingredients of adjuvants or vaccine carriers are not listed individually on the package insert. So the physician would have no way of knowing that there was peanut oil in the vaccine. The ingredients of adjuvants is considered a "trade secret" and has the protection of many governments not to be revealed. [...] 11. How pure can we make peanut oil? I assume it is highly refined but it only would take a teeny weeny bit of peanut protein in a vaccine to create a problem. That is, of course, assuming that it is ONLY the peanut protein that causes the allergy. Using my "guessing" math, only 1 shot out of 1680 would need to be contaminated to create a peanut allergy in 1 in 70 people in Great Britain.