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Thyroid medications: GH peptides can affect thyroid hormone metabolism
They concluded that while GHK-Cu does demonstrate anti-wrinkle effects in cellular studies, "there is a surprising absence of clinical studies using them." The review identified skin permeation as the central challenge: GHK's high aqueous solubility and low partition coefficient work against transdermal absorption
Collagen and extracellular matrix: GHK-Cu upregulates genes encoding collagen I, collagen III, elastin, decorin, and other extracellular matrix components that provide structural support to skin
What are the most common types of meniscus tears
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