A deficiency can also cause issues such as diarrhea, nausea, vomiting, lack of appetite, weight loss, pale skin, numbness and tingling in your hands and feet, confusion, irritability, depression, and behavior changes
"The adolescent and adult form of cobalamin C disease: clinical and molecular spectrum"
For men, a normal hemoglobin level is 13.2 to 16.6 g/dL, and for women, 11.6 to 15 g/dL.[ref] A normal vitamin B12 level is usually defined as 400 pg/mL or higher
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Vegetarians or vegans with potential B-12 deficiencies