They are not regulated by the FDA, you really have to do your homework on getting the right one, and you can never be exactly sure whats in it
Adverse events There was no statistically significant difference in the incidence of adverse events between treatment groups (Table 2)
For androgenetic alopecia (pattern hair loss), GHK-Cu is an add-on, not a primary treatment
Further, there is no indication of medical efficacy of these unregistered products with GLP-1 claims, in particular for weight-loss. The TGA urges consumer caution when purchasing medicines from unknown overseas websites, suggesting these products could be fake, contain incorrect or undisclosed and harmful ingredients, and may not meet the same standards of quality, safety and efficacy as those approved by the TGA for supply in Australia
doi:10.1055/s-0036-1584295 Serra-Torres S, Bellot-Arcs C, Montiel-Company J, Marco-Algarra J, Almerich-Silla J