Yep, what animal said. I recently made a prop/fina combo that turned out crystal clear and has the normal characteristics of a normal prop post-inject but the soreness doesn't occur at every inject site. I originally didn't like the idea of so much BA and BB as the solvent, so I tested by adding 1% at a time of BA and BB until I got it to dissolve really well before filtering, oil, heating, etc... It was my first attempt at suspending prop/fina so I let a friend of mine be a guinea pig for me. He started using it 2 weeks after moving and joining a gym he liked. He noticed a huge difference in the stuff even before joining the gym. He was like, "Spook! What the hell did you put in this stuff? I'm growing a little just using it and sitting on my ass every day!!!" From the average schmoe I'd dismiss it, but he used to take in several grams a week of the shit.
If you don't use the right solvents of proper amount of solvent, yes, it will crash big time and will crystallize in the muscle tissue....OUCH!!!!! Better to recrystallize in the flask than in the muscle.