When I worked as a librarian people periodically asked me to do research on the flu shot (often because they were being forced by their employer to get one) and it was impossible to find any information about what is actually IN a flu shot anywhere. I don't care if it's "proprietary." Companies and the medical establishment need to be more open with information, and not just that you can search for it. That takes a lot of time. They need to offer more. I totally get why people don't trust them.