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

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

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Anaphylactic reaction after injection of vitamin B12 Heres a case of two female patients with pernicious anemia who had adverse reactions to B12 shots (hydroxocobalamin)

How B12 Aids in Weight Loss Vitamin B12 does not directly cause weight loss, but it plays an important role in several processes that can help you lose weight

Severe muscle weakness or cramping, which can be a sign of low potassium that needs treating