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I think looking at the actual data from the one clinical study, there wasn't statistical significance until all three of the pieces of data were pulled together
Research-Grade GHK-Cu vs Cosmetic Copper Peptide Serums Injectable vs Topical Forms in Research Literature The published literature is heavily weighted toward topical and in-vitro application
The article also discusses related peptides, such as MOTS-c and SS-31, which complement L-Glutathione in promoting metabolic efficiency and cellular resilience
The International journal of neuroscience , 37 1-2, 85-8
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