IM muscular injections of fast acting water based products such as GH, Slin, Vit B-12, etc have an absorbtion rate of 57% verses Sub-Q which is 69%.
That would conclude IM would take longer to be fully absorbed, which would change the shape of the peak by lowering and extending it.
I read that in my PDR last night. Thought Id share. I would have suspected IM to be absorbed faster than SubQ.