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The cut-off between normal vitamin B12 levels and deficiency varies by method and laboratory, but most laboratories define subnormal serum or plasma values as those lower than 200 or 250 pg/mL (148 or 185 pmol/L)
As a result, every batch we ship includes lot-specific HPLC and mass spectrometry documentation verifying the peptide profile
Certificate of Analysis documents should confirm identity, purity, and absence of contaminants
Peptide Forums: GHRH, Sermorelin, and General Peptide Use - The main community hub for peptide discussion, including GHK-Cu protocols, sourcing, and stacking strategies
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