Liver damage is more likely to get you than injection dangers. It gets more guys into more danger than shooting does.
Injecting is always risky, not usually from bad injection procedure, although that WILL DEFINITELY catch up to you.
But from not knowing the quality of what you are injecting. None of us can really know how good what we are getting is.
You can heat and Wman filter it all you want. It might simply have heavy metals in it.
Its a risk we all take.
Heroin addicts shoot plenty of crazy dirty shit from a dirty spoon with a dirty syringe daily INTO VEINS and plenty are doing ok, usually its the heroin that gets them.
Any steroid user should be a borderline medical tech. Its the only safe way to do it. Learn, read everything, not bro procedure, actual medical procedure.
All steroid users should have access to medical personal if needed, and a personal stash of strong antibiotics, a full course.
If you cant afford these things, you are not using responsibly and should not be using.