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Refrigeration at 2C8C (36F46F) after opening maximizes the full 28-day safety window
Because this article has 7 major sections, scan the headings first and then use the FAQ or summary sections to pressure-test the answer
The current GHK-Cu FDA approval status is mainly influenced by high drug development costs, limited clinical data, formulation stability challenges, and its established role as a GHK-Cu cosmetic ingredient
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