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They replace deficient B12 when absorption or intake is inadequate
In the UK, self-administration of hydroxocobalamin injections is supported by the NHS following appropriate training and medical supervision
To minimize discomfort, ensure the area is clean and relaxed, use a new needle, and inject slowly
Summary: True vitamin B12 overdose is exceptionally rare because it is water-soluble and excess amounts are excreted through urine rather than accumulating in body tissues
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