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Megson, Existing and potential therapeutic uses for N-acetylcysteine: The need for conversion to intracellular glutathione for antioxidant benefits
Molecular & Cellular Proteomics 13 , 25132526 (2014)
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Old bacteriostatic water or contaminated solution causes reactions
Commercial GHK-Cu serums typically claim 6-12 month shelf life unopened when properly formulated with preservatives and appropriate pH, dropping to 3-6 months after opening due to air exposure and contamination introduction
