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Peer review Peer review information Communications Biology thanks Chao Mao and the other, anonymous, reviewer(s) for their contribution to the peer review of this work

Copper peptides stimulate fibroblasts, or skin cells, to produce more, as well as to eliminate damaged fibres and replace them with new ones

Tsujii S, Ishisaka M, Shimazawa M, Hashizume T, Hara H

It is particularly praised for having minimal side effects compared to other GH secretagogues, as Ipamorelin does not appear to elevate stress-related hormones

Older dogs and less active breeds may benefit the most

A favorite before events or as part of a regular beauty maintenance routine