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[29] In February 2020, Greenfields book, Boundless , appeared on the Publishers Weekly Adult Bestsellers list
Copper Peptide GHK-Cu is a naturally occurring copper complex of the tripeptide glycyl-L-histidyl-L-lysine
I always suggest taking these two along with amino acids (be sure to only have up to 300 mg per day of vitamin B6, as higher doses can be neurotoxic)
B, Enzymatic, 6 (3), 175184
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