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The challenge isn't whether it worksit's ensuring the GHK-Cu you use is pure and that you formulate it in a way that preserves its bioactivity
Although many research peptides remain stable for days to weeks under proper refrigerated storage, there is no universal expiration period that applies to every compound
Glutathione and related enzymatic activities
Antioxidant Protection As a potent antioxidant, L-Glutathione neutralizes free radicals, protecting skin cells from oxidative damage
Temperature excursions above 15C trigger irreversible aggregation
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