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Does GHK-Cu work for gray hair

doi: 10.1046/j.1365-2133.2003.05303.x

A retrospective chart review by Lee et al

Overall, the creator's claims align with the conceptual direction of GHK-Cu research, though human clinical evidence remains limited outside of cosmetic/aesthetic contexts
New treatments in spinal muscular atrophy
These statements do not imply or establish safety, efficacy, bioavailability, or appropriateness for administration outside of controlled laboratory settings