does b12 injection make you tired Feeling worse after Injection: Answering concerns Why do I feel worse

They will typically arrange a full blood count, serum B12 and folate tests, and may consider testing for anti-intrinsic factor antibodies if pernicious anaemia is suspected

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[1] [3] The body cannot produce B12, so it must be obtained through diet (primarily animal products) or supplementation

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Medical History Impact Your medical history also affects how often you need B12 shots

Within the amount of liquid is the prescribed mg dosage of your medication (see mg chart)