Injection site stinging after using dilute acetic‑acid water as a peptide solvent

Posted by amber464 in Safety & Side Effects - 1 points, 0 comments.

1 % acetic acid mix). The powder dissolves nicely, but I started noticing a sharp sting at the injection site that lasts about 10‑15 minutes after each sub‑Q dose. I tried a 1:10 dilution with bacteriostatic water first, then added the acid to bring the final volume up, thinking the pH would be low enough to dissolve but not so low to irritate tissue.

5, which is probably the culprit. Switching to a 1:20 final dilution reduced the sting noticeably, though the solution looks a bit cloudy. I also rotated sites more aggressively and pre‑warmed the syringe to body temperature, which helped a bit.

Has anyone else seen this with acetic‑acid solvent? Any tips on optimal dilution or buffering that kept the solution clear but spared the burn?

Community discussion - research and educational context only. Not medical advice.