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Nature communications , 12 (1), 470

Based on customer results since the GHK-Cu Hair Serum hit the market, the answer appears to be two

Sealed jar design: Protects ingredients from air and contaminants, preserving potency and ensuring hygiene

Provides a powerful glutathione boost for skin lightening and detox

You might see injectable GHK-Cu offered by online gray-market retailers selling supplies from unregulated pharmaciesbut this is a big red flag and safety risk

This interplay is partially mediated by neuropeptides such as calcitonin gene receptor peptide (CGRP), pituitary adenylate cyclase activating polypeptide (PACAP) and/or cortical spreading depression (CSD) and involves oxidative stress, mitochondrial dysfunction, nucleotide-binding domain-like receptor family pyrin domain containing-3 (NLRP3) inflammasome formation, activated microglia, and reactive astrocytes