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Also, vitamin B12 deficiency tends to come on very slowly, so people often go through a long period of being mildly deficient
Poor hygiene or reused needles can cause infection, and an injection placed badly can rarely irritate a nerve
B12 tablets can often be cut in half or added together
References 1 Nature Medicine (2014)Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity (preclinical)
It can be given via the NHS or privately
ISBN 978-3-8055-8255-1
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