Vitamin B12, like all B vitamins, is water-soluble, which means the body expels what it does not use, explained Harvard Health.

The site added: “Its main job is to maintain healthy nerve cells, support proper brain function, and assist in the production of DNA and RNA.

“Low levels of B12 can cause fatigue, nervousness, dizziness and numbness.

“Diet is the best way to get B12 and the average adult should consume 2.4 micrograms (mcg) of vitamin B12 a day, according to the National Institutes of Health.”



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