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It is a preservative-efficacy limit, not a chemical-stability limit
As we age, the balance shifts from tissue repair toward tissue degradation, and the body produces less GHK-Cu
Patients who stop at this point typically retain results for 4 to 8 months before drifting back to their untreated trajectory
356 This recovery is attributed to the positive selection of hematopoietic stem cells (HSCs), where HSCs with a higher load of deleted mtDNA are hard to survive, while those with a lower load are selected for survival
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