No. Not if you're very sanitary and do it right. Doctors use the IM method all the time to put drugs in people. Sure, there's risks - but no worse than the risks associated with eating unresearched chemicals. As long as you use a new, sterile syringe every time, filter the solution, and do the injection right, there's really not much to worry about - what exactly do you mean by "fuck yourself up bad"?Isn't it pretty easy to fuck yourself up bad by sticking a needle with chemical in your arm/leg/etc??
im / iv just doesn't seem necessary (to me) except for economy I suppose. plus needles are scary for wimps