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Vitamin B12 is essential for DNA synthesis, healthy nerve function, and red blood cell production all of which help support normal muscle function

Contact your GP immediately, call NHS 111, or attend A&E if you develop: Irregular heartbeat or palpitations that persist Chest pain or pressure Severe breathlessness Significant leg swelling These symptoms require assessment to determine their cause, which may or may not be related to your B12 treatment

But how many different kinds of B vitamins are there, and how do our bodies use them

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