This is my 5th purchase from them and this time i used their slin pins and i used the same precautions, alcohol swabbed the vial and the injection site and i ended up with MRSA ( a mutated form of staph infection that is immune to most antibiotics) 3 days later directly at the injection site! Huge freaking gaping puss filled wound that hurt like hell. I'm Seriously never buying from them again because something tells me their sterilization processes are less than hospital grade.