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Some specific causes include: Certain medical conditions

[DOI] [PubMed] [Google Scholar] 38.Hackl H, Burkard TR, Sturn A, Rubio R, Schleiffer A, Tian S, Quackenbush J, Eisenhaber F, Trajanoski Z

(National Institute of Health or NIH Vitamin B12 shots are normally available by prescription only, although dosage varies depending on age and medical history

Athletes often seek ways to improve their stamina and recovery times, and adequate levels of B12 can contribute to better oxygen transport in the blood, which is crucial for endurance

If you know you have MTHFR mutations, discuss B12 form with your prescriber and consider methylcobalamin if available