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Plus, GLP-1's have some association with muscle loss, she says
* GHK-Cu/Estriol/Niacinamide/Tretinoin This anti-aging formula contains peptides and other ingredients to help improve skin elasticity, smooth fine lines and wrinkles, promote collagen production, reduce signs of aging, and restore a youthful, glowing complexion
Because these two categories act through different proposed pathways, one aimed at the growth-hormone axis and the other at localized tissue repair, this pairing (a secretagogue alongside a repair peptide) is the combination most frequently described across bodybuilding peptide discussions, with the secretagogue framed as supporting muscle and recovery capacity and the repair peptide framed as supporting the joints and connective tissue that sustain harder training
This works for both skin and even hair
Our explainer on how tirzepatide influences incretin pathways and the overview at what tirzepatide (Mounjaro/Zepbound) is and how it works walk through the receptor pharmacology
![Adapted from [22,23]). Possible mechanisms of amiodarone-induced](https://www.researchgate.net/publication/337600654/figure/fig1/AS:830213739003909@1574949788944/Adapted-from-22-23-Possible-mechanisms-of-amiodarone-induced-hypertriglyceridemia.png)
