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Importantly, CD38 is also expressed on cells of the innate immune system, including natural killer (NK) cells, and on cells outside of immunologic networks such as red blood cells (RBCs) and platelets [1, 4,5,6, 11]

Their efficacy has not been confirmed by FDA-approved research, and they are not intended to diagnose, treat, cure, or prevent any disease

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I havent had many side effects, except for occasional mild headaches, but overall, Im happy with the results." Source: Reddit - r/Peptides 2

Stacking Protocols Community sources sometimes describe layering AHK-Cu with GHK-Cu in a copper-peptide skin or scalp routine, on the rationale that the two copper tripeptides have overlapping but distinct profiles GHK-Cu carrying the larger collagen and wound-healing literature (Pickart & Margolina 2018, PMID 29986520) and AHK-Cu the narrower hair-follicle signal