Multiple users now are reporting that it has a super low pH -- around 2.5, which would be like injecting vinegar. One person could barely weight-bear on their leg for a week after injecting it.
This is not how it should normally be, peptides should be buffered during manufacture. If you inject this shit it will cause intense pain and radiating tissue damage, and that will last weeks+. The only study I could find that tested the injection of super low pH solutions into volunteers stopped at pH 3.0 for ethical reasons. Volunteers rated the pain as "excruciating."
Get litmus strips to test it. If it's acidic, throw it out.
QSC is so far ignoring the problem.