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ECM Remodeling: Collagen, Elastin, GAGs# In dermal fibroblasts, GHK-Cu upregulates type I and III collagen, elastin, decorin, and glycosaminoglycan synthesis while simultaneously activating matrix metalloproteinases (MMP-1, MMP-2) and their tissue inhibitors (TIMPs)

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General safety observations from published health sources show: Oral glutathione is well tolerated in moderate doses Long-term use does not suppress natural production No evidence suggests dependency or rebound effects Side effects are rare and usually mild Mild side effects, when they occur, may include bloating or headache, often linked to excessive dosing rather than duration of use

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Metabolic phenotyping and indirect calorimetry Single-housed male DIO C57BL/6J mice were acclimatized to metabolic cages (16-channel Promethion, Sable Systems International) for 1 week before the start of the study

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