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2% GHK-CU (Copper Tripeptide-1) Clinically tested at 0.1% concentration, it increased collagen production by 51%, skin firmness by 25%, and skin density by 23%, in 84 days
Bourebaba N, Kornicka-Garbowska K, Marycz K, Bourebaba L, Kowalczuk A
ACS Nano 8 , 47714781 (2014)
It depends on both copper and zinc as cofactors, but only copper regulates its activity ( 2 O 2 , CuZn-SODs activity is suppressed, via oxidation of His-118 to form 2-oxo-histidine (Uchida and Kawakishi, 1994)
This leads to the major motor symptoms of tremor, bradykinesia, and rigidity, along with postural difficulties, which are classical for PD (Obeso et al., 2017)
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