When we take a look at a study done comparing injectable vs. oral contraceptives, we find that the oral version at 70mgs/week (10mgs/day given orally) is more effective at affecting SHBG levels than 400mgs/week given via an injection! (9)In this study, testosterone undecanoate was given at a constant dose along with norestisterone (which raises SHBG). What we see is that when norestisterone is given orally, it produces a far greater effect on SHBG, than when it is administered via an injection. And this is even when the doses of the injectable are 4x higher!
Here’s a chart, illustrating exactly what I’m talking about in this study, which I think suggests very strongly that injectable versions of drugs, when compared with the oral version, will have nowhere near as much of an effect on SHBG: