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In lab and skin model studies, GHK-Cu shifts how fibroblasts behave, and fibroblasts are the cells that produce much of the collagen and elastin that keep skin firm
Yan Y, Pan C, Du Y, Li D, Liu W
The deciding factor is most likely going to come down to your own lifestyle, if you cant get in the gym 4 times a week then you cannot train your chest 4 times
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Oral Intake of Enzymatically Decomposed AP Collagen Peptides Improves Skin Moisture and Ceramide and Natural Moisturizing Factor Contents in the Stratum Corneum