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Tricomin (copper peptide complex) trials: A commercial formulation containing GHK-Cu showed statistically significant increases in hair density and reduced hair shedding in three separate studies in the late 1990s

This is not a formal ceiling because no FDA-approved limit exists, but it represents the upper range of what is supported by preclinical scaling and provider experience

State pharmacy requirements, prescriber judgment, the dispensing pharmacys licensure and practices, and the patients clinical circumstances also matter

There's also a well-documented artemisinin-free version called Artemisia Naphta oil which performed well at 1% in a small human trial for sensitive and acne-prone skin