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According to a direct collagen production study, GHK-Cu outperformed retinoic acid by showing measurable collagen improvement in 70% of participants compared to 40% for the retinoid
[ CrossRef ] [ Google scholar ] [ PubMed ] Liu X, Grogan TR, Hieronymus H, Hashimoto T, Mottahedeh J, Cheng D, et al
Recent developments in thymosin beta 4 research: from regenerative medicine to cancer treatment
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