is vitamin b12 injection safe in pregnancy Injections: Benefits for Your Health Vitamin B12 Injection at a
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Yes, and the combination may offer more than either peptide alone

Anti-inflammatory and antioxidant effects: GHK-Cu downregulates pro-inflammatory cytokines (like IL-6) and upregulates antioxidant enzymes (such as superoxide dismutase)

I., ChemRxiv, 2020, 119, 10.26434/chemrxiv.12973130.v1 [DOI]

For example, too much vitamin B12 has been linked to higher cancer rates and death in some studies
Clinical Trial Safety Data Phase 1 trials (healthy volunteers): The first human safety studies in healthy volunteers showed excellent tolerability

Always follow your doctor's instructions