Some of them are as follows: Small intestine bacterial overgrowth (SIBO): The harmful bacteria use the available B12 before it has been absorbed by the small intestine, thereby leading to a deficiency
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Seek urgent medical attention (via NHS 111 or 999 in an emergency) if you experience severe or persistent abdominal pain, persistent vomiting, signs of dehydration (such as dizziness, reduced urination, or extreme thirst), or symptoms suggestive of low blood sugar (such as shakiness, sweating, or confusion)
High-dose oral treatment is effective and is increasingly popular
A Retired Registered Nurse about Vitamin B12 injections How to Inject Vitamin B My Experience with B12 Injections I recall years ago in nursing school when my lab supervisor asked me to give her routine insulin shot