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GHK-Cu is a naturally occurring copper-complexed tripeptide (Glycyl-L-Histidyl-L-Lysine) studied for its effects on collagen, glycosaminoglycan synthesis, and antioxidant gene expression in skin fibroblast models

While some claim that it worked wonders on their acne others say that it gave them serious blackheads and zits

The main risks are skin irritation with high concentrations and the contamination concerns associated with poorly sourced or improperly prepared formulations

Comparing Holotranscobalamin and Total Vitamin B12 in Diagnosing Vitamin B12 Deficiency in Megaloblastic Anemia Patients

However, complete inactivation of monophenolase activity in jr PPO1-wt was achieved only when both activity controller residues were mutated (Asn240Lys/Leu244Arg and Asn240Thr/Leu244Arg)

USA 79 , 345349 (1982)