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What is B12?

Your body needs B12 to keep your nerves and cells healthy. If your levels get too low, you can experience serious health problems.

Low B12 can be caused in 2 ways: not getting enough B12 in your diet, or not absorbing vitamins in your diet correctly.

Who is at risk for low B12?

What happens if you don’t treat low B12?

If untreated, low B12 levels can lead to serious problems that affect your heart and brain like: anemia, irreversible nerve damage, memory impairment, early-onset dementia, and depression.

Intended for U.S. Residents Only
4 Becker Farm Road, Suite 103, Roseland NJ 07068
April 2016 ELB034


Eligen B12™ is indicated for the dietary management of patients who have a diagnosed vitamin B12 deficiency that cannot be managed by a modification of the normal diet alone. This deficiency can be caused by a range of conditions in which there is an impaired capacity to absorb vitamin B12.

Important Safety Information

You should not take Eligen B12™ if you are allergic to vitamin B12, cobalt, or any ingredient of Eligen B12™.

You should not take Eligen B12™ if you have Leber’s disease, which your doctor may refer to as hereditary optic nerve atrophy. Cyanocobalamin can lead to optic nerve damage (and possibly blindness) in people with Leber’s disease.

Before using Eligen B12™, tell your doctor or pharmacist if you:

  • Are or may be allergic to cyanocobalamin (vitamin B12) or cobalt
  • Have an iron or folic acid deficiency
  • Have kidney or liver disease
  • Have low potassium blood levels (hypokalemia) or gout
  • Have a blood disorder called polycythemia vera
  • Have an eye disease called hereditary optic nerve atrophy (Leber’s disease)
  • Are receiving any medication or treatment that affects bone marrow
  • Have other vitamin/mineral deficiencies (especially folic acid and iron)

Get emergency medical help if you have any of these signs of a serious reaction: muscle cramps, weakness or irregular heartbeat, hives, difficulty breathing, swelling of your face, lips, tongue or throat.

Call your doctor at once if you have a serious side effect, such as feeling short of breath, even with mild exertion, sudden vision changes or slurred speech.

Less serious side effects may include diarrhea, itching or rash.

Before using Eligen B12™ tell your doctor or pharmacist all of the medicines you are taking, especially methotrexate, pyrimethamine, any antibiotics, and any vitamins.

You are encouraged to report negative side effects of medical foods to the FDA. Visit or call 1-800-FDA-1088.