But if you just want the fast answer, most research shows GHK-Cu to be the more broadly studied copper peptide for both hair and skin
doi: 10.1111/pce.12351 186 YuH.LuoD.Yau LiS
These include botany, morphology, microscopy, high-performance thin-layer chromatography (HPTLC), high-performance liquid chromatography (HPLC), liquid chromatography with mass spectrometry (LC-MS), inductively coupled plasma mass spectrometry (ICP-MS) for heavy metals testing, spectrophotometric methods (UV-Vis, FTIR), testing for microbial contamination, and other standard scientific methods
Suppresses the formation of acne/blemish/pimples Improves skin complexion Remove excess free radicals Certainly, It minimizes pores on the skin and prevents acne
Natural Standard Research Collaboration (NIH)
Deep learning in breast cancer imaging: state of the art and recent advancements in early 2024