Everything is a poison, what matters is the dose. I think Paracelsus said that. Still completely true. Beside the dose, the duration of exposure to a chemical (think about pollution, chemicals released from factories in the air/soil/water).
But ANY chemical in a high enough one-dose CAN make you sick, and even kill you Even water!
So, before people start to worry about various components in vaccines, they should look at the dose of the components, and see the studies that found out at what dose have serious ill effects been observed, for those things.
You consume more MSG, sucrose, arginine, and potassium phosphate at one fast food kids meal… Of course, if you are allergic/sensitive to arginine/gelatin/MSG etc. you may have side effects from eating fast food…