Irregular heartbeats or palpitations can be another indicator of vitamin B12 deficiency. These palpitations can be unsettling and may be accompanied by a feeling that your heart is racing and lightheadedness. If you're experiencing heart palpitations, it's essential to rule out nutritional deficiencies, such as low iron, as a potential cause. Both low iron and a B12 deficiency can interfere with the body's ability to produce healthy red blood cells causing anemia and leading to heart palpitations.

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