question about soreness after injection

[Coop77]

Is the soreness in the days following an injection primarily from the compound, or from the physical act of jabbing a needle into your muscle? I've done two injections of Test E and my ass is sore as hell. Is this a good indication that my gear isn't fake? Or if it was just empty oil would it hurt just the same?

[01dragonslayer]

It can be a combination of creating scar tissue and reaction to the solvents used in making the conversion.

[j2111111]

I only used for a short period(5 weeks) before I ran out. A buddy and I split a cycle and coulcdnt get anymore to finish. I switched where I shot every week from left to right butt and arm but for a few days where ever I shot it was tender. I am no where near experienced but Im sure it was the shot that caused the tenderness.