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They include pain or redness at the injection site, slight swelling or tenderness, mild diarrhea, and sometimes itching or a generalized feeling of body swelling
However, someone with a more severe deficiency might need to wait a little longer, possibly requiring multiple injections to replenish their B12 stores
A B12 deficiency can cause demyelination, leading to neuropathy with neurological signs like numbness, pins and needles, and muscle weakness, especially in the feet and hands
Vitamin B and other water-soluble vitamins need to be distinguished from fat-soluble vitamins such as Vitamin E and Vitamin D, which can be stored in the liver as a reserve