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Stem Cell Reports
Research-grade GHK-Cu should have batch-specific Certificates of Analysis showing third-party HPLC purity testing and mass spectrometry molecular identity confirmation
Blood testing for B12 directly hasnt got a gold standard either Total/serum B12 contains both the active/useable fraction (holotranscobalamin) and the inactive fraction bound to a carrier (holohaptocorrin)
COA ( )
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