Eggs are abundant sources of several nutrients necessary for the proper functioning of the human body. A large egg contains about 6.28g of protein, a nutrient needed for cellular repair and energy, according to the USDA National Nutrient Database. They are also abundant sources of vitamin A, an antioxidant vitamin, as well as niacin, iron, pantothenic acid, sodium and selenium. Vitamin B12, also called cobalamin, is also found in eggs.
Vitamin B12 Content
One large egg contains about 0.45mcg of vitamin B12, or about 19 percent of the recommended daily intake, according to the USDA National Nutrient Database. An extra-large egg offers 0.5mcg of this vitamin, which is about 20 percent of the recommended intake, and a jumbo egg provides about .56mcg, or about 23 percent of your recommended daily intake of vitamin B12.
Vitamin B12 helps your body turn carbohydrates in foods into glucose, which it uses for energy, according to the University of Maryland Medical Center. It also helps your body produce DNA and RNA, which are the genetics material found in your body's cells. Vitamin B12 improves your body's ability to use iron and generate red blood cells, which may help prevent anemia. It also works with folate to aid in the manufacture of S-adenosylmethionine, a chemical that may reduce the symptoms of depression and boost immune system function. Along with vitamins B9 and B6, vitamin B12 may inhibit production of homocysteine, an amino acid linked to heart disease.
Vitamin B12 may reduce the effectiveness of tetracycline, a drug used to treat respiratory, urinary tract and skin infections, according to the University of Maryland Medical Center. Numerous drugs, such as anticonvulsants, diabetes medications, stomach acid reducers and chemotherapy drugs may deplete vitamin B12 levels in your body.
Taking more than 800mcg of folic acid per day may mask a vitamin B12 deficiency, which is characterized by nervousness, numbness or tingling in your extremities, fatigue and breathing difficulties. Although rare, a vitamin B12 deficiency may cause permanent nerve damage, according to the University of Maryland Medical Center. Also, although eggs are abundant sources of vitamin B12, they are also loaded with saturated fats, which can cause lipid deposits in your arteries that can lead to high blood pressure, stroke and heart disease. Obtain at least part of your daily requirement of vitamin B12 from leaner sources, such as skim milk, chicken breast or fish.