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Hence, low levels of serotonin, a substance essential in elevating mood, may be produced in people with vitamin B12 insufficiency

Cyanocobalamin is synthetic and must be converted before its usable, making it less efficient for some people

Vitamin B12 is found exclusively in animal foods or foods fortified with this vitamin, such as: Meat and chicken: especially organ meat and red meat like beef Fish and seafood: especially clams, sardines, tuna, trout, and salmon Dairy: including milk, cheese, and yogurt Eggs: especially egg yolk Fortified foods: breakfast cereal, nutritional yeast, as well as some mock meats or plant milks Supplements, which are widely available in stores and online, are another way to meet your daily requirements
Comparing costs of intramuscular and oral vitamin B12 administration in primary care: A cost-minimization analysis

It happens in about 5-10 percent of people and is usually harmless