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The first is extracellular matrix biology: fibroblast culture and rat wound-chamber work from the Maquart and Simeon groups reported that GHK-Cu stimulates collagen, glycosaminoglycan and small proteoglycan synthesis while simultaneously upregulating matrix metalloproteinase-2 and its tissue inhibitors, a combined synthesis-and-turnover signature unusual among matrix-active compounds
For example, low dopamine levels can contribute to poor motivation and difficulty sustaining attention, while imbalances in acetylcholine may impair working memory and information processing
The authors concluded that supplementation of HA to collagen did not improve various skin parameters, and therefore, the dermal benefits of the HA active ingredient could not be confirmed in this study [53]
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Glutathione interferes with this process and shifts melanin production from darker eumelanin to lighter pheomelanin
