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This means this ingredient may not be fungal acne safe

*Correspondence: Bassem Sadek, [email protected] This article was submitted to Neuropharmacology, a section of the journal Frontiers in Pharmacology Disclaimer All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers

Ingredients are selected based on safety and stable performance

Regarding their stability and formulation: GHK-Cu: Relatively less stable, more easily broken down by enzymes, commonly found in serums and creams

A later study tested the same keratin protein in humans over two weeks using a ramped dose protocol