Once administered intramuscularlytypically into the deltoid or gluteal musclehydroxocobalamin (the form most commonly used in the UK) enters the bloodstream rapidly
Also, people with diabetes who take a medication called metformin are at a higher risk of developing B12 deficiency because this medication can reduce B12 absorption
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Gas, loss of appetite, diarrhea, constipation
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Low B12 doesnt directly cause weight gain, but chronic fatigue and slow metabolism from a deficiency may lead to reduced activity levels, contributing to weight gain over time