evidence: Though articles and individuals attempting to make this link propose a variety of mechanisms for the ways in which an inoculation could contribute to the development of peanut allergies, each relies on the false premise that vaccines (childhood and/or influenza) contain undisclosed traces of peanut oil. [...] This assertion appears to have its roots in the 2011 book The Peanut Allergy Epidemic by Heather Fraser, which has a section about the potential presence of peanut oil adjuvants in vaccines. Fraser attempts to argue that some kinds of adjuvants in injections (not specifically childhood vaccines) may have, through poorly understood mechanisms, sensitized children to peanut and other allergies. This specific chapter (and the evidence it cites) appears to be the basis for a number peanut oil claims on numerous anti-vaccine websites. [...] In case the complete and total lack of evidence supporting the claim that peanut oil can be found in vaccines convinced you that they were peanut free, anti-vaccine advocates also throw in a burden-of-proof logical fallacy to contend with: that pharmaceutical companies are doing it secretly and there is literally no way to know for sure.