Dr Hyman is not a fan of the flu shot. He said that they don’t really work and the multi-dose vials contain mercury. Mercury is toxic and has been linked to memory problems, immune problems and neurological problems. http://drhyman.com/blog/2010/11/18/supporting-your-immune-system
I prefer to use the thieves products to protect myself from bacteria and viruses. I support my immune system with True Source, Omegagize and Ningxia red. I haven’t had a flu shot in years.