A 2024 randomized controlled trial (RCT) with 60 women (ages 40-65) applied 0.1% GHK-Cu cream twice daily for 12 weeks, yielding 31% wrinkle reduction (visia analysis) and 28% improved skin elasticity versus placebo (Kim et al., 2024)
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Lipid-conjugated protamine peptides, developed as permeation enhancers, have enabled sublingual delivery of proteins with molecular weights from 22 to 150 kDa in mouse models, with effects comparable to subcutaneous injection
After stimulations, chamber slides were fixed with 4% paraformaldehyde for 20 minutes, blocked in 10% goat serum in phosphate-buffered saline (PBS) with 0.1% saponin for 1 h and then stained with integrin-1 antibody (M-106, Santa Cruz Biotechnology, Santa Cruz, CA, USA) in 0.1% saponin in PBS for 2 h at room temperature