WebMD states that vitamin B-12 has a part in making DNA and keeps red blood and nerve cells healthy. Vitamin B-12 is also used to treat fatigue, heart disease, high cholesterol, Alzheimer’s disease, breast cancer and sickle cell disease. Vitamin B-12 supplements treat deficiencies often found in people over 50.
According to WebMD, some types of anemia and digestive problems are related to a vitamin B-12 deficiency, and low vitamin B-12 causes nervous system issues, memory loss and a general overall weakness. If a patient is found to have elevated levels of homocysteine in the blood, an increased amount of vitamin B-12 and folic acid is often recommended by a doctor. A study has shown that an intake of vitamin B-12 along with folic acid and vitamin B6 reduces the occurrence of age-related macular degeneration in women with heart disease.
WebMD states that high doses of vitamin B-12 have not shown any adverse effects, and 0.4 micrograms to 2.8 micrograms a day are recommended depending on the age and medical condition of each person. Breastfeeding women are advised to take the highest dosage of at least 2.8 micrograms a day. Dairy products, fish, meats and eggs are natural sources of vitamin B-12.