I definitely don’t like the creosote based preservatives that give it that weird smell.
I have type 1 though, so it’s indisputable that it’s healthier for me than no insulin - without external insulin, I’d be in DKA, a coma and then dead probably in less than a week.
They are also used in bandage packages, also some medical soaps, sanitizer and anesthetic - metacresol and phenol.