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Side effects are rare and usually mild, such as slight redness or swelling at the injection site

While B12 is generally safe, caution is needed in specific clinical situations: Lebers Disease (Hereditary Optic Neuropathy): B12 injections are generally contraindicated or should be used with extreme caution, as they may potentially aggravate optic atrophy in this rare condition

Cell 140 , 4961 (2010)

Chemotherapy-induced peripheral neuropathy (CIPN) IV GSH as a chemoprotectant with platinum agents: Network/meta-analytic syntheses suggest reduced severe neurotoxicity in some analyses, but trial results are mixed and heterogeneous in dosing, timing, and outcomes

For a deeper look at the copper peptide's evidence, consult the full GHK-Cu guide

Research labs typically use 30 mL vials for research applications, though smaller sizes are sometimes preferred for lower-volume laboratories