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Description
Acidic amino acids have carboxyl functional groups in their side chains
For GHK-Cu FDA approval, pharmaceutical products must meet strict requirements for impurity control throughout the entire shelf life
7 hours for spadin), attributed to its improved metabolic stability
The catch is that they are biologically active peptides, not a passive ingredient
[DOI] [PMC free article] [PubMed] [Google Scholar] 33.Keung MY, Wu Y, Badar F, Vadgama JV
