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The most common adverse effects are gastrointestinal , occurring in 20-50% of patients and including nausea, vomiting, diarrhea, constipation, and abdominal pain
Disappointing (see full publication in the Lancet)
Usually settles within a few weeks
The wellness positioning of B12 shots as an energy or weight-loss boost for healthy people is not supported by the NHS, by NICE, or by published trial evidence
When researchers tested it at higher doses, the results were jaw-dropping
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