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In the UK, hydroxocobalamin is the preferred injectable formulation prescribed by the NHS for treating confirmed B12 deficiency

How GHK-Cu Compares to Retinoids, Vitamin C, and Other Anti-Aging Ingredients The 1998 head-to-head trial by Abdulghani measured procollagen synthesis side by side, and the copper-binding peptide outperformed both vitamin C and tretinoin

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[DOI] [PubMed] [Google Scholar] 82.Nakano M., Patel N.K

And while nothing is going to be a longevity silver bullet, these three peptides might have what it takes to set you up for long-term success