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.

their diet.

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Natural sources of the vitamin include organ meats, shellfish, meat, poultry, eggs and dairy (3).

Vegetarians and vegans can consume this vitamin by eating algae, nutritional yeast and seaweed, but these sources often aren’t enough. If you’re vegetarian you might also need to rely on B12 fortified foods or taking supplements.

B12 deficiency is also common in people over the age of 50 (3). As your age, it becomes increasingly difficult for your body to absorb vitamin B12 from foods because you produces less stomach acid, which