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The strongest human clinical evidence is for topical use, including the Leyden 2002 photoaging trial and a 2023 NEEL gel topical study reporting an average 28% increase in skin collagen density at 3 months

PMID: 41530565 ACS Environ Au Machine Learning-Assisted Recognition of Environmental Sulfur-Containing Chemicals in Nontargeted Mass Spectrometry Analysis of Inadequate Mass Resolution

Anemia Prevention: Vitamin B12 is essential for the production of red blood cells

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Cost: 1,500-2,000 total Result: Healing in 1/3 typical time The Bottom Line Neither peptide is definitively "better"they're different tools for different jobs