Vitamin B12 is essential for nerve function, red blood cell production, and DNA synthesis — and low levels can show up as fatigue, brain fog, balance issues, numbness or tingling, and mood changes often written off as normal stress or aging.

able to process vitamins properly if you suffer from digestive problems, such as Crohn’s disease or Celiac’s disease.

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It’s also important for protein metabolism and the conversion of carbohydrates into glucose (3).Study Biology

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