feeling exhausted after b12 injection π tired, run down, or dealing with brain fog?, Low vitamin could be part of the reason. B12 injections can help restore healthy vitamin B12 levels, support energy production, improve Why Do I Feel Worse
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Nat Chem Biol

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Association between insomnia and personality traits among Japanese patients with type 2 diabetes mellitus
But for people with normal B12 levels, injections do not reliably cause targeted fat loss

Folate and vitamin B12 status in the Americas
Additionally you may have difficulty walking, memory loss, or even numbness and tingling
