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There's nothing that says "a vampire sucked my blood and all I got was a lousy t-shirt" like a Vitamin B12 deficiency. Chronic fatigue and brain fog are among the most common complaints. This essential vitamin is necessary for energy production, mood regulation, cognitive support, metabolic functions, digestion and more. Lots of people are low in B12. Because almost no plants contain a high dose of bioavailable Vitamin B12 3, vegans and many vegetarians need to take a supplement to get their fill. People over the age of 65 have been found to be at increased risk of B12 deficiency. Also folks with impaired digestion easily become deficient because they lack the digestive fire needed to absorb B12. This is especially true of people with IBS, Crohn's disease and those taking stomach acid-lowering medication. The blood sugar regulating drug metformin has also been found to lead to low B12 levels.