why is vitamin b12 an injection Injections Vitamin B12 Shot - Delaware:

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These reactions can occur after the first or subsequent doses and may present as severe allergic responses, including difficulty breathing, swelling, and potentially life-threatening shock Khatrawi2022Sajan2023Ullah2018

As a result, the body can quickly access and utilise vitamin B12, and individuals may experience rapid improvements in symptoms associated with deficiency, such as fatigue, weakness, and neurological symptoms