topical ghk-cu side effects “Is actually worth it?” is genuinely one of the most common questions in my comments, so let me finally answer it properly., The short version: copper peptides have real research behind them, GHK-Cu Dosage and Protocol: A
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It has been studied for protection of the liver from toxic damage (alcohol, antibiotics, etc.)

Asghari Adib E, Smithson LJ, Collins CA (2018) An axonal stress response pathway: degenerative and regenerative signaling by DLK

doi: 10.1073/pnas.91.8.2890

Can I still have abs if I remove stubborn belly fat