B12 injections are an effective strategy for managing your mood and mental health. The synthesis of mood-regulating neurotransmitters including serotonin and dopamine can be impacted by low levels of B12. These are the brain chemicals responsible for controlling your mood. The B vitamins, especially vitamin B12, are essential for your body to manufacture the substances it needs for energy. A vitamin B12 injection will undoubtedly increase your energy level if you are weak in it. In actuality, weariness is one of the initial symptoms of a vitamin B12 shortage. Your body may have low potassium levels as a result of B12 injections. Although uncommon, this reaction might result in heart palpitations, severe exhaustion, and cramping of the muscles.