A vitamin B12 deficiency can wreak havoc on the entire body, leading to symptoms such as lightheadedness, general weakness or lack of energy, shortness of breath, muscle aches, and heart palpitations. A lack of vitamin B12 can also cause neuropathy. The protective layer around the nerves, the myelin sheath, quickly becomes damaged when there is insufficient B12. Without this layer of protection, the nerves may stop functioning properly, resulting in neuropathy.
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