Vitamin B12 is an essential nutrient that plays a critical role in several of your body’s processes.
It’s necessary for proper red blood cell production, DNA formation, and nerve function.
Vitamin B12 also plays a key role in reducing levels of an amino acid called homocysteine, high levels of which he been linked to chronic conditions like heart disease, stroke, and Alzheimer’s.
Additionally, vitamin B12 is important for energy production. However, there’s currently no evidence that taking B12 supplements increases energy levels in people who are not deficient in this nutrient.
Vitamin B12 is found mostly in animal products, including meats, seafood, dairy products, and eggs. It’s also added to some processed foods, such as cereal and nondairy milk.
Because your body can store B12 for several years, serious B12 deficiency is rare.
It can be caused by not getting enough of this vitamin through your diet, problems with absorbing it, or taking a medication that interferes with its absorption.
If you’re at risk of deficiency, taking a supplement may help you meet your needs.