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Cell Cycle (2018) 17:12129
and J.R.Z
Copper coordination compounds as biologically active agents
When choosing products, look for formulations that list GHK-Cu or copper peptides high up in the ingredient list, indicating a higher concentration

Vitamin B12 Deficiency and the Nervous System: Beyond Metabolic Decompensation-Comparing Biological Models and Gaining New Insights into Molecular and Cellular Mechanisms