yes you can. I was gonna do this but was gonna only shoot GH+slin 3x per week in the blast method, so unfortunatley where as my slin dose will only take up .1 of a cc, the gh is gonna be too much to fit it all in same pin. I'd like to do the localized area as well. I think I may go 10iu's GH in one pin, shoot it in my bi, then fill up the other syringe with 5iu GH and 10iu slin and shoot it in same spot or like a millimeter next to it. Im sure it will do the same thing.