Several things influence how long a B12 injection lasts for you: Your current B12 levels: the lower you start, the more your body tends to hold on to, which can stretch the effect
National Center for Biotechnology Information (2026)
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Key Benefits of GHK-Cu (Copper Peptide) Skin Rejuvenation & Anti-Aging, Hair Growth & Scalp Health, Wound Healing & Tissue Repair Peptide GHK-Cu is best known for supporting skin renewal signals that are linked in studies to collagen and elastin balance
[DOI] [PubMed] 139.Ruotsalainen M., Majasaari M., Salimaki J., Ahtee L
While neither is universally "better" than the other, both copper peptides and hyaluronic acid offer unique and complementary benefits for skin health