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NHS guidance lists common effects such as pain, swelling, or itching at the injection site and nausea
Its mechanisms include modulation of neurotransmitter signaling that promotes slow-wave activity, reduction of nighttime cortisol and stress hormone interference with sleep architecture, and support for the timing and depth of the sleep cycle itself
Women with gastrointestinal disorders (Crohns, celiac, IBS) that affect absorption [*]
So how to explain all the anecdotal evidence that seems to prove B12 works for so many
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