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B12 deficiency can lead to symptoms such as fatigue, weakness, shortness of breath, cognitive changes, peripheral neuropathy (pins and needles), and anaemia

Injection-site reactions are among the most commonly reported side effects: patients may experience pain, stinging, or mild burning at the IM injection site

Key handling errors that can cause problems include: Shaking the vial vigorously during reconstitution, which denatures the peptide Using sterile water instead of bacteriostatic water, which lacks preservatives and allows bacterial growth Storing reconstituted peptide at room temperature instead of refrigerated Leaving the vial exposed to light, which degrades photosensitive amino acids Using reconstituted peptide beyond its stability window, typically 3-4 weeks Properly handled AOD 9604 should be clear and colorless in solution

The findings of these studies, along with animal research, demonstrate why GHK-Cu has become a popular ingredient in topicals intended to reduce a host of skin- and hair-related concerns