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In February of 2020, the FDA began to crack down on this practice by putting out an advisory

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After reaching 70% confluence, fibroblasts were cultured for 24 h in 1% FBS DMEM and then incubated with either TGF1 10ng/ml (Peprotech, Dollard des Ormeaux, Quebec, Canada), GHK 10 nM (Sigma, Markham, Ontario, Canada) or control media (1% FBS DMEM, penicillin, streptavidin) for a further 48 h

The FDA's own career scientists have published documents outlining concerns that even if peptides are trendy, evidence to support loosening restrictions is still inadequate