As I said before PA is still thought to be the primary culprit here, other causes of B12 deficiency such as malabsorption caused by metformin, H2 blockers, PPIs, parasites, etc
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The World Anti-Doping Agency maintains a prohibited list that includes dozens of performance peptides
Use Cases: When Each Route Fits Topical GHK-Cu -- Localized Skin and Hair Goals The evidence supports topical use for: Facial aging and wrinkle reduction -- the most clinically validated use case, with multiple controlled studies Post-procedure recovery -- documented benefits after CO2 laser resurfacing Hair and scalp health -- community reports describe topical application to the scalp, though controlled hair-specific studies are limited General skin quality -- increased density, thickness, elasticity, and collagen documented in clinical studies Common audience: users primarily targeting cosmetic skin outcomes with the strongest available evidence base and the simplest application method
Its biological effects may persist for several weeks after administration, but detection is a different matter