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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
Opposite macrophage polarization in different subsets of ovarian cancer: observation from a pilot study
Understanding the difference helps explain why ingredient selection, formulation, and delivery systems matter
Oncogene , 42 (31), 24022414
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