ghk-cu copper peptide hair growth clinical study human randomized Conditioner this serum is designed to rejuvenate hair follicles Ghk-Cu Shampoo | Copper Peptide
Description
This suggests that the current recommendation for vitamin B12 is likely not high enough

PMID 22961902

Both peptides are GHRH (growth hormone-releasing hormone) analogs
Recently, a proof-of-principle study showed that in vitro rejuvenation of fibroblasts is achievable and reverted the fibroblast aging phenotype, which can be useful for regenerative medicine purposes 206