by 
The Curious Bag
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Vitamin B12 injections have recently been touted as a cure for everything from low energy to obesity. Although vitamin B12 does play an important role in heath, it is not a panacea and should not be taken or injected without the approval of a licensed physician.
Depression
Many people who suffer from depression are found to be vitamin B12 deficient when tested, according to the National Institutes of Health's Office of Dietary Supplements. B12 shots can improve depression, but it is not clear exactly how.
Heart Health
When the level of B12 in the blood is low, levels of an amino acid called homocysteine rise. Homocysteine can damage arteries and increase the risk of heart disease. Injections of vitamin B12 can help people who are vitamin B12 deficient avoid heart disease.
Cancer
Vitamin B12 shots can help prevent cancer by helping the body use vitamin B9 efficiently. The body uses vitamin B9 to make DNA.
Anemia
Vitamin B12 is crucial to the body's production of red blood cells. Inadequate amounts of vitamin B12 can lead to anemia.
Misconceptions
Contrary to the claims of some vitamin B12 supplement vendors, the Mayo Clinic reports that there is no evidence to suggest that vitamin B12 assists weight loss.
Source:
National Institutes of Health Office of Nutritional Supplements
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