Yes, you just have to experience it first hand-eventually you can find a suitable amount of carbs for your per iu of slin.
Its obviously one of those things you want to err on the high side with and have standby carbs in case you start going hypo.
Once you figure that-THEN you can introduce the IGF and assess its effect on your glucose needs.
Took me a while to get my own system down, and I used slin 5-6 times stand alone before trying it with IGF.
Very good advice from HP. Hypo is a funny ass feeling but when it kicks hard you damn well know.
Usually get that dizzy hungry feeling and vision is affected, then heart rate increase, weakness in the legs, and then the sweating...thats when your in bad shape.