I'm not sure about fina, because I haven't taken any of that stuff yet. What I can tell you is that for my first (and only so far) cycle I injected TT sust into my quad and for the first 2 weeks I can honestly say that I have never felt pain quite like it. I even had to ditch work for a couple of days. For whatever reason, the pain subsided in the weeks to come, after which the delt injections didn't hurt at all.