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(1997) Vitamin B12 treatment for delayed sleep phase syndrome: a multi-center double-blind study

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Muscle cramps and weakness If a B12 deficiency is preventing the body from producing enough red blood cells to get oxygen to muscle tissues, you may experience associated symptoms, like sporadic muscle cramps or weakness [3]

Kolovrat M, Gojkovic S, Krezic I, Malekinusic D, Vrdoljak B, Kasnik Kovac K, et al