difference between glutathione and reduced glutathione (GSH), Endogenous antioxidant (CAS 70-18-8) Glutathione Redox cycle. Abbreviations. GSSG:
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For selected symptomatic patients please review Figure 1: B 12 Test Result Review and Process Algorithm for Patients with Risk Factor for B 12 Deficiency* and/or Non-specific** or Specific Symptom of B 12 Deficiency

PMID 23033492

They come in different protocols for various patients
