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Although MedlinePlus says that Normal values are 160 to 950 picograms per milliliter (pg/mL), the clinical reference UptoDate says that a normal serum vitamin B12 level is above 300 pg/mL

Here are six of the peptide-prescribing doctors and clinic heads who stand to potentially win more business from their decisions: Gabriel Alizaidy Title: Scientific Director of Maximus Health, a telehealth company offering peptides Who he is: Alizaidy calls himself a "peptide and hormone researcher, educator, and advisor." According to LinkedIn, he went to medical school in Pakistan and did a master's in precision health at the University of Chicago