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A 2024 review in BioImpacts synthesizing the topical GHK-Cu evidence concluded that the peptide has consistent anti-wrinkle and skin-rejuvenating activity in human studies, though formulation and delivery remain ongoing challenges [5]

Injectable peptides marketed for scars lack human evidence

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Certain seminal peptides influence sperm motility, adhesion to the oocyte, and polyspermy prevention, suggesting cross-talk between peptide systems in fertility

10.1186/s13054-022-04034-9 138 ZhaoZ.ZhuP.LouY.HouR.SunH.DuY.et al (2025)

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