Mine is mailed from CVS Specialty Pharmacy. They even sent a nurse to instruct me and watch me give my 1st auto-injections shot. For me, my everyday breathing is pretty decent. I did notice that it boosted my resting O2 saturation rates. They were 92=93 and now they’re 94-95%. I don’t FEEL different but am happy. I do notice I don’t get an exacerbation when I have things that might normally trigger one, like if my POC malfunctions or I’m having a rough day due to other things.