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(2013) Pernicious Anemia: For Patients and Visitors Penn Medicine (2022) How to choose the right B12 for you. MTHFR Support Australia (2010-) Randomized, Placebo-Controlled Trial of Methyl B12 for Children with Autism. Journal of Child and Adolescent Psychopharmacology

Patients in this borderline range should not dismiss symptoms simply because their B12 level is above the strict cutoff clinical context and additional testing matter

McDonough JE, Yuan R, Suzuki M, Seyednejad N, Elliott WM, Sanchez PG, Wright AC, Gefter WB, Litzky L, Coxson HO, Par PD, Sin DD, Pierce RA, Woods JC, McWilliams AM, Mayo JR, Lam SC, Cooper JD, Hogg JC: Small-airway obstruction and emphysema in chronic obstructive pulmonary disease

Oral supplements or infusions of vitamin C are often recommended alongside the injections