This is ignorant/uniformed, but, taking research chemical by ingestion feels like I have some natural barriers still. Where-as I feel like there's a much more raw exposure to risk with injection. Also there's dumb risks like infection, if I don't attend well enough to injections.

In spite of these protests, I think you are probably much closer to the truth here. Thanks for writing. These reactions I have are, I suspect, not really significant.