Thanks for this comment. I maintain the unpopular position that both 1) phenylephrine is mildly effective for drying out my sinuses, and 2) MSG definitely gives

Thanks for this comment. I maintain the unpopular position that both 1) phenylephrine is mildly effective for drying out my sinuses, and 2) MSG definitely gives me headaches, unlike salt, so most likely glutamate is the culprit.