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Here are the common symptoms of a vitamin B12 deficiency: Fatigue and weakness Brain fog and memory problems Numbness or tingling in hands and feet (called peripheral neuropathy) Shortness of breath Mood changes, such as depression or anxiety Can vitamin B12 deficiency be a sign of cancer

A., & Loland, C

Archived from the original on 2016-03-17

Natural food sources are almost entirely animal-derived: meat, fish, eggs and dairy, plus fortified foods such as some plant milks and yeast extracts

While a mild deficiency might not immediately present noticeable symptoms, untreated cases can lead to: Fatigue, weakness, or persistent feelings of tiredness and lightheadedness