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They consider the patients health history, how severe the deficiency is, and any conditions that might affect how well the body absorbs B12
22 May 2026 6 min Why do I feel worse after my B12 injection
Presence of B12-blocking drugs or hormones
Oral vitamin B12 is often considered when diet is the suspected cause
Irritating a nerve Injected in the wrong spot, a needle can come close to a nerve and cause sharp pain, tingling, numbness or weakness
Not evaluated by the FDA.
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