So statements that topical AHK-Cu is "well tolerated" rest on the copper-peptide class generally much of it built on GHK-Cu (Pickart & Margolina 2018, PMID 29986520) and on community use, rather than on dedicated AHK-Cu safety study
the 2024 Redox Biology paper extended findings into murine lung-inflammation and fibrosis attenuation (PMID 38879894)
It could indicate contamination or that the peptide has been damaged and has fallen out of solution
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Injection Site Reactions: Pain, redness, swelling, or tenderness at the site where the injection was given
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