Vitamin B12 is taken by mouth to treat and prevent vitamin B12 deficiency, a condition in which vitamin B12 levels in the blood are too low. Vitamin B12is also taken by mouth for memory loss, Alzheimer's disease, to slow aging, and to boost mood, energy, concentration, mental function, and the immune system.click here link
                            

Vitamin B12, also known as cobalamin, is an important water-soluble vitamin (1Trusted Source).
It plays an essential role in the production of your red blood cells and DNA, as well as the proper functioning of your nervous system.Vitamin B12 is naturally found in animal foods, including meats, fish, poultry, eggs and dairy. However, it can also be found in products fortified with B12, such as some varieties of bread and plant-based milk.Unfortunately, B12 deficiency is common, especially in the elderly. You’re at risk of deficiency if you don’t get enough from your diet or aren’t able to absorb enough from the food you eat.

Unfortunately, symptoms of a vitamin B12 deficiency can take years to show up, and diagnosing it can be complex. A B12 deficiency can sometimes be mistaken for a folate deficiency.

Low levels of B12 cause your folate levels to drop. However, if you have a B12 deficiency, correcting low folate levels may simply mask the deficiency and fail to fix the underlying problem (3Trusted Source).

Here are 9 signs and symptoms of a true vitamin B12 deficiency.

Do you get enough vitamin B12? You'll want to make sure that you do, in order to stay healthy.

Vitamin B12 does a lot of things for your body. It helps make your DNA and your red blood cells, for example.

Since your body doesn't make vitamin B12, you have to get it from animal-based foods or from supplements. And you should do that on a regular basis, because your body doesn't store vitamin B12 for a long time.

Food Sources of Vitamin B12
You can get vitamin B12 in animal foods, which have it naturally, or from items that have been fortified with it.Animal sources include dairy products, eggs, fish, meat, and poultry. If you're looking for a food fortified with B12, check the product's Nutrition Facts label.

Vitamin B12 Deficiency
Most people in the U.S. get enough of this nutrient. If you're not sure, you can ask your doctor if you should get a blood test to check your vitamin B12 level.With age, it can become harder to absorb this vitamin. It can also happen if you have had weight loss surgery or another operation that removed part of your stomach, or if you drink heavily.

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