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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

A healthy gut microbiome is heavily involved in the synthesis and absorption of B vitamins

There are four main types of vitamin B12methylcobalamin, adenosylcobalamin, hydroxocobalamin, and cyanocobalamineach offering unique benefits and varying levels of bioavailability

The original version of this article was revised: that first and last names of the authors were switched and published incorrectly

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