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Homocysteine and methylmalonic acid (MMA) are the two reliable tests that reflect B 12 status [131]

doi: 10.1038/ng1743

The study looked at different patients admitted to hospital for a variety of painful symptoms caused by a vitamin B12 deficiency The study noted: Patient D is a 33-year-old woman with a history of fatigue, inertia, indolence, paraesthesia in her hands and feet, difficulties concentrating, problems with remembering things, and word finding disturbances

21 Moreover, it was also reported that no treatment-related adverse effects were reported, as also emphasized by other studies, such as pain, swelling, or any side effects because of the injection