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Choose GHK-Cu when: The research question involves broader skin and tissue regeneration that includes hair as one component wound healing, collagen synthesis, gene expression modulation, or anti-aging applications where hair growth is a secondary endpoint alongside skin quality improvement
Laboratory evidence: A serum B12 level confirming deficiency, or prior documentation of intrinsic factor antibodies for pernicious anemia
Both are used in advanced peptide-based formulations
If you follow a vegan or vegetarian diet, consider taking supplements or consuming fortified foods
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