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The additives do not change optimal injection sites
Of the peptides commonly discussed in this conversation, GHK-Cu has the longest history in dermatology and the most extensive published literature on skin-specific effects, including fibroblast stimulation, regulation of the enzymes that remodel the extracellular matrix, and support of hair follicle biology
10.3390/antiox9100909 Antioxidants
They capture a static snapshot but may miss whether use has changed recently or why
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