HouseCat said:
Assuming aseptic technique is being used, sterility shouldn’t become a problem provided the BAC syringe needle never goes into the litter box before it enters the vial.

All you’re doing is putting something sterile into your KLOW recon, which is sterile or at least sterile enough.
Tomorrow I’m trying GHK-Cu with NaCl BAC, and I’ll report back on whether that cuts down the sting, at least in my case.
Which site do you use for KLOW? For the GHK-Cu sting, upper buttock has worked well for me—it brings it down to nearly nothing, and people say that same sting is what’s behind the KLOW sting. I recon 50mg GHK-Cu with 6mL BAC / starting tomorrow, 6mL NaCl BAC.
Good luck—hopefully it make it more tolerable for you!