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For others, it may take several days or even a few weeks to experience the full effects, as your body gradually rebuilds its B12 stores and enhances red blood cell production

Vitamin B12, typically delivered as methylcobalamin or cyanocobalamin, is essential for red blood cell production, nervous system health, and the metabolic conversion of food into ATP, your cells' energy currency

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A nurse at the time had them and said "nice work if you can get it" when I said I'd been told to go and lie down in a dark room when I got them, but with being self-employed I just had to carry on, but barely could