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It's a cosmetic ingredient, not a drug

But the dose is not always optimized for B12 repletion specifically

Anthony Didato, DMD Balanced Aesthetics + Wellness Leaky Gut (Intestinal Permeability) and Systemic Inflammation Increased intestinal permeability allows endotoxins (LPS) to enter the bloodstream, triggering systemic inflammatory cascades linked to anxiety, depression, brain fog, Frontiers in Immunology KPV Anti-Inflammatory Tripeptide From Alpha-MSH KPV is the C-terminal tripeptide of alpha-melanocyte-stimulating hormone (alpha-MSH) with potent anti-inflammatory properties

If these adducts are not adequately repaired, they can induce DNA replication errors, DNA strand breaks, and mutations, eventually causing tumor development (Fahrer and Christmann 2023