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In the UK, hydroxocobalamin is the standard form used for intramuscular injections, and routine monitoring of serum B12 levels during replacement therapy is generally not required once treatment is established
10.1016/j.expneurol.2014.08.026 159
Sun exposure is not a precipitating factor
[29] [30] Other supplements taken alongside B12, particularly magnesium, vitamin C in high doses, or probiotic preparations, may affect bowel habits
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