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References Quality & Purity This product is synthesized via solid-phase peptide synthesis (SPPS) and tested to 99% purity by HPLC with identity confirmed by mass spectrometry

The key point: the best option depends on the reason for low B12 and your clinical context

De Novellis D, Fontana R, Guidice V, et al

For a growing number of health-conscious Americans, peptide therapy has proved to be a life-changer