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Consulting a healthcare provider before starting treatment is important, particularly for individuals with pre-existing medical conditions or those taking medications

Hypothyroidism (underactive thyroid) is a common cause of cold intolerance in the general population and should be excluded if symptoms are persistent (NHS)

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Kanbak, Age-related changes in the glutathione redox system, Cell Biochem

in fibroblast culture models it stimulates collagen, elastin, and glycosaminoglycan synthesis at picomolar to nanomolar concentrations (10 to 10 M), and modulates metalloproteinase (MMP-1, MMP-2, MMP-9) activity and their inhibitors (TIMP-1, TIMP-2), functioning as a general regulator of extracellular matrix remodeling ( Mechanistic research establishes that GHK activates TGF- and integrin 1 pathways during tissue repair, attracts immune and endothelial cells to wound sites, and restores gene expression patterns toward a healthier fibroblast phenotype in models of aging and radiation damage ( A 2018 review in IJMS characterizes its role in collagen production, nerve outgrowth stimulation, and dermal stem cell marker expression ( For Research Use Only
2007;133(5):909917 [DOI] [PubMed] [Google Scholar] 41