I have found few 5um filters (rather cheap) in order to filtrate possible glass contamination for IM injections
Monoject Filter Needle
Sterifix® Filter Straw
BD blunt filter needles
but what about the possibility that they also filtrate some cerebrolysin active ingredients? How do you solve that problem?
Is there anybody who uses such 5um filters and still experience tha same therapeutic effect as without it and on the contrary who "feels" the it differs?