Vitamin B12 (Cyanocobalamin) Oral or Nasal Supplements

For education only

This guide cannot diagnose a condition or recommend a personal treatment plan. Discuss medical questions with a qualified professional.

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VITAMIN B12 (VAHY tuh min B12), or CYANOCOBALAMIN (sye an oh ko BAL a min), prevents and treats low vitamin B12 levels in your body. It is used in people who do not get enough vitamin B12 from their diet or when their digestive tract does not absorb enough. Vitamin B12 plays an important role in maintaining the health of your nervous system and red blood cells.

Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.

They need to know if you have any of these conditions:

Health issues you have now or have had in the past
An unusual or allergic reaction to any medication, supplement, food, dye, or preservative
Pregnant or trying to get pregnant
Breastfeeding

Take this supplement as directed on the label. Do not take it more often than recommended. Talk to your care team if you take other medications or supplements.

Talk to your care team before giving supplements to a child. Special care may be needed.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.

NOTE: This medicine is only for you. Do not share this medicine with others.

Do not use this supplement more often than directed.

Other medications or supplements may interact with this product.

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

See your care team for regular checks on your progress.

Side effects that you should report to your care team as soon as possible:

Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat

Side effects that usually do not require medical attention (report these to your care team if they continue or are bothersome):

Diarrhea
Fatigue
Headache
Nausea

This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Keep out of the reach of children and pets.

Most supplements should be stored at room temperature. Check your specific product directions. Protect from heat and moisture. Get rid of any unused supplement after the expiration date.

NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.

Note: Introduction and Additional Common Questions written and medically approved by Cleveland Clinic professionals.

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Peptide Therapy Guide Editorial Team