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Good food sources include Brazil nuts, yellowfin tuna, oysters, grass-fed beef, chicken, wild caught shrimp and shiitake mushrooms

Fish, meat, poultry, eggs, milk and other dairy products are good sources of vitamin B12 Clams and beef liver are some of the richest sources of vitamin B12 Some breakfast cereals and non-dairy milks (soy, oat, etc.) are fortified with vitamin B12 If the body does not have enough vitamin B12 then you may experience symptoms such as fatigue, pale skin, headaches, low mood, stomach issues, difficulty concentrating, inflammation of mouth and tongue, pins and needles, muscle weakness, or impaired coordination

Mayo Clinic 2015)

It can lead to signs and symptoms of dysautonomia, like: Damage to your peripheral nerves causes peripheral neuropathy