If MSG doesn’t make you sick that’s great. There are people who react to other foods and additives and some who don’t. Some are allergic to peanuts or milk and just because others aren’t doesn’t mean that those foods aren’t deadly for the sufferers. I personally would not subject myself to an additive that isn’t necessary (if the food was seasoned properly) to risk these types of side effects. I firmly believe there are many migraine and headache sufferers out there who do not know the source of their pain is MSG. But here you go… https://thejournalofheadacheandpain.biomedcentral.com/articles/10.1186/1129-2377-14-2