Some provide doses of vitamin B12 that are much higher than recommended amounts, such as 500 mcg or 1,000 mcg, but your body absorbs only a small percentage of it. The amount of vitamin B12 in supplements varies widely. Research has not shown that any form of supplemental vitamin B12 is better than the others. Vitamin B12 is also available in a form that’s dissolved under your tongue (called sublingual vitamin B12). Other common forms are adenosylcobalamin, methylcobalamin, and hydroxycobalamin. It is usually in a form called cyanocobalamin. Vitamin B12 is available in multivitamin/multimineral supplements, in B-complex supplements, and in supplements containing only vitamin B12. What kinds of vitamin B12 dietary supplements are available? Manufacturers are not required to list vitamin B12 on the label if a food naturally contains this vitamin. To find out if a food has added vitamin B12, check the Nutrition Facts label. Some breakfast cereals, nutritional yeasts, and other food products are fortified with vitamin B12.Clams and beef liver are some of the best source of vitamin B12.Fish, meat, poultry, eggs, milk, and other dairy products contain vitamin B12.You can get recommended amounts of vitamin B12 by eating a variety of foods including the following: Plant foods have no vitamin B12 unless they are fortified. Vitamin B12 is found naturally in a wide variety of animal foods, and manufacturers add it to some fortified foods. Average daily recommended amounts for different ages are listed below in micrograms (mcg): Life Stage The amount of vitamin B12 you need each day depends on your age. Vitamin B12 also helps prevent megaloblastic anemia, a blood condition that makes people tired and weak. Vitamin B12 is a nutrient that helps keep your body’s blood and nerve cells healthy and helps make DNA, the genetic material in all of your cells. #Vitamin b12 500 mcg professionalFor more details, see our health professional fact sheet on Vitamin B12. This is a reader-friendly overview of Vitamin B12. Where can I find out more about vitamin B12?.Does vitamin B12 interact with medications or other dietary supplements?.What are some effects of vitamin B12 on health?.What happens if I don’t get enough vitamin B12?.What kinds of vitamin B12 dietary supplements are available?.What is vitamin B12 and what does it do?.
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