b12 injection makes me tired Why do I feel worse after a injection? How Can Vitamin B12 Shots

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Its primary function is to transfer a methyl group to nicotinamide, a form of vitamin B3

Have a plan for monitoring and response

Some discomfort at the injection site is common, but if the pain, swelling, redness persist for long or aggravate, then a doctor should be consulted

See BNF, BSH and NICE CKS links for more info

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