Bimodular peptide synthetase SidE produces fumarylalanine in the human pathogen Aspergillus fumigatus
This is the study that matters most for the "before and after" question, because it used the exact demographic most GHK-Cu consumers belong to: women over 50 with real photodamage, not 25-year-olds with minor texture concerns
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GLP-1
For patients, this can mean less expense, fewer side effects, and less dependency on pills a day
GI side effects, the most reported, include nausea, vomiting, constipation, and diarrhea