What people inject is not the hormone itself, but a secretagogue (aside from people who directly inject insulin). > You can take it indefinitely, but you must

What people inject is not the hormone itself, but a secretagogue (aside from people who directly inject insulin). > You can take it indefinitely, but you must take it indefinitely in order for it to keep its effectiveness because the body isn't producing enough of the hormone. I don't think we consider this (weight gain due to overeating) to be a GLP-1 deficiency, although I'd be interested to see research on that.