Now i know some guru is going to come in here and neg me, but this is for safety and i could care less..It is very important that you use a filtered needle (or some kind of filter) when using glass ampule!! When u break the ampule open u shatter very small partials of glass everywhere!! I know sure some will say u can visibly see them and some of the pieces you can but what about the micro fine pieces. Others will tell you they cant make there way up into the needle and this is very untrue. The partials of glass are so small they can diffidently make there way up into the needle... So please for your own health spend the extra few $ and use some kind of Filter.

Heck i even use a filtered needle for the last of my vials because sometimes i see rubber from the stopper in the bottom and it freaks me out.