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Understanding the difference helps explain why ingredient selection, formulation, and delivery systems matter
Acting prematurely can create serious consequences
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References and citations RESEARCH CITATIONS [1] Bhatt DL et al
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
Designed for all skin types and non-comedogenic, it layers cleanly under SPF and over serums
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