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Is injecting GHK-Cu safe
doi: 10.1007/s40257-018-0404-3 405 JiangWNiBLiuZLiuXXieWWuIXet al
Precursor amino acids (NAC, glycine, glutamine), liposomal formulations, and intravenous delivery may achieve higher cellular levels, though evidence remains mixed and varies by individual

A1 Adenosine Receptor Activation Modulates Central Nervous System Development and Repair
If you want the biology the literature predicts, you need a delivery method that bypasses the stratum corneum
