ghk cu side effects injection of ghk-cu Copper Peptides for Skin: The Science, Benefits, and Best Practices GHK-Cu Peptides Before and After:

The most common administration-site reactions were injection-site reaction [150 events in 38 (5%) participants] and injection-site erythema [64 events in 42 (6%) participants]

These companies represent some of the most capable partners available to beauty entrepreneurs and established brands that want to launch peptide-focused skincare products

The most common side effect is temporary irritation at the injection site, like redness or itching

Pharmacol Ther 123:5479 Dsouza DC, Singh N, Elander J, Carbuto M, Pittman B, De Haes JU, Sjogren M, Peeters P, Ranganathan M, Schipper J (2012) Glycine transporter inhibitor attenuates the psychotomimetic effects of ketamine in healthy males: preliminary evidence

This doesn't mean peptides are risk-free, but the risks are orders of magnitude lower