Thanks Tweva very interesting information.
I would choose to do it as a last resort, because it is hard to make it “at home” and be 100% sure that it is completely clean.
One more reason for me is fact that here it is pretty easy to get all kind of (vial, ampule) drugs, and they are pretty cheap.
So I am just piling that.
But yes, I understand the point, knowledge is important about how to make something, I would go and check more about this definetly.