The same is true of B vitamin complex supplements, which deliver 50 to 500 micrograms (i.e., 20 to 200% of the RDA), as well as for most supplements containing only vitamin B12, which deliver up to 1,000 micrograms (about 400% of the RDA)
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
(PubMed) Fernandez-Roig S, Lai SC, Murphy MM, Fernandez-Ballart J, Quadros EV
Promotes healthy skin, hair, and nails: Adequate B12 supports cellular health, contributing to a more vibrant appearance