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Symptoms of B12 deficiency include: Fatigue Low mood or personality/mood changes Irritability Lethargy Headaches Palpitations Loss of appetite Pale yellow tint to the skin A feeling of pins and needles (paraesthesia) Poor memory Impaired cognitive performance Depression Weakness Impaired digestion Inflammation Gastrointestinal lesions Neurological damage Since B12 is primarily found in animal products, any change in ones diet that leads to a decrease in the consumption of such products such as a vegan , vegetarian, or low-fat diet can increase the chance of a person developing a B12 deficiency

Some people may experience a bit of pressure in their chest, though this is less common

Gemelli G.V., Behrman R.E., editors

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The above procedure was repeated with inhibitor concentrations spanning 0.3-60 M to determine the effective concentration (EC50) required to inhibit 50% NNMT activity in cultured adipocytes