Vitamin B12 Dosage for Adults & Kids: Your GoodRx Guide
If your vitamin B12 levels are low, your prescriber may recommend a prescription vitamin B12 supplement. But what’s the right dose of vitamin B12? Here’s the guide.
cyanocobalamin
Used for Vitamin B12 Deficiency
Used for Vitamin B12 Deficiency
Nascobal (cyanocobalamin) is a nasal spray used to treat and prevent low blood vitamin B12 levels (vitamin B12 deficiency). It can also help keep vitamin B12 levels stable in adults with anemia due to low vitamin B12. Nascobal (cyanocobalamin) is available by prescription only and used once per week. Possible side effects include infection, headache, and runny nose.
What is Nascobal (cyanocobalamin)?
What is Nascobal (cyanocobalamin) used for?
- To maintain normal vitamin B12 levels in adults with pernicious anemia (low red blood cell count due to low vitamin B12) after receiving cyanocobalamin injection
- To treat and prevent vitamin B12 deficiency in adults
How Nascobal (cyanocobalamin) works
Nascobal (cyanocobalamin) is a form of vitamin B12. Vitamin B12 is important for several processes in your body, including these three major roles:
- It promotes red blood cell production to help treat and prevent a condition called pernicious anemia.
- It keeps nerve cells healthy so that they work well.
- It helps make genetic material (DNA).
Drug facts
| Common Brands | Nascobal |
|---|---|
| Drug Class | Vitamin |
| Controlled Substance Classification | Not a controlled medication |
| Generic Status | Lower-cost generic available |
| Availability | Prescription only |
More on Nascobal (cyanocobalamin) essentials
Side effects of Nascobal (cyanocobalamin)
The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.
Common Side Effects
- Infection (sore throat, common cold; 13%)
- Headache (4%)
- Weakness (4%)
- Nausea (4%)
- Tongue inflammation (4%)
- Nasal symptoms (e.g., stuffy or runny nose, sneezing, itching; 4%)
- Tingling or burning sensation (4%)
Nascobal (cyanocobalamin) serious side effects
Contact your healthcare provider immediately if you experience any of the following.
- Serious allergic reaction: rash; trouble breathing; swelling of the lips, tongue, or face; vomiting
The following Nascobal (cyanocobalamin) side effects have also been reported
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
- Swelling of the ankles, hands, or feet
- Trouble breathing
Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):
Get your GoodRx coupon
$557.49
GoodRx discount
$174.27
Pros and cons of Nascobal (cyanocobalamin)
Pros
- Helps raise vitamin B12 levels
- Taken once per week as one spray in one nostril
- Good option for people who don't want to swallow tablets or use injections
Cons
- Might be difficult for some people to use properly
- Hasn't been studied in children
- Shouldn't be used if you're sick with nasal symptoms
Pharmacist tips for Nascobal (cyanocobalamin)
- Mark your appointments in your calendar to see your provider and get any ordered blood tests drawn. You'll typically need blood tests done 1 month after you start treatment and then every 3 to 6 months. This will help you and your provider see how well Nascobal (cyanocobalamin) is working for you, look for any safety concerns, and adjust your dose if needed.
- Make sure you know how to use Nascobal (cyanocobalamin) properly. Contact your provider or pharmacist if you have any questions.
- Each Nascobal (cyanocobalamin) spray provides one dose and is only meant to be used one time. Make sure you're ready to take your dose when you're using the nasal spray to avoid accidentally wasting the medication.
- Since each Nascobal (cyanocobalamin) spray device contains enough medication for only one dose, throw the nasal spray away after each use, even if there's still some medication left inside. Use a new spray device each time to make sure you get the full dose of medication.
- Discuss with your provider about how much vitamin B12 you should be getting from your diet while you're taking Nascobal (cyanocobalamin). It's possible you might be able to stop Nascobal (cyanocobalamin) early if you can maintain healthy vitamin B12 levels through your diet.
- Vitamin B12 is found in many other multivitamins and supplements. Make sure to read labels carefully on all of the dietary supplements you're taking to see if it contains Nascobal (cyanocobalamin).
- Store Nascobal (cyanocobalamin) upright in a cool and dry place at room temperature and in its original container. This helps protect the medication from light.
More on Nascobal (cyanocobalamin) tips
Risks and warnings for Nascobal (cyanocobalamin)
Nascobal (cyanocobalamin) can cause some serious health issues. This risk may be even higher for certain groups. If this worries you, talk to your doctor or pharmacist about other options.
For use in the nose only
While cyanocobalamin is available in oral forms (taken by mouth), Nascobal (cyanocobalamin) should only be used in your nose. Don't give yourself this medication any other way. If you feel a nasal spray isn't the best choice for you, ask your pharmacist or provider for other options to treat or prevent your low vitamin B12 levels. If you or someone else takes Nascobal (cyanocobalamin) by mouth, get medical help right away or contact a poison control center at 1-800-222-1222.
Allergic reactions
Allergic reactions to Nascobal (cyanocobalamin) are possible. These reactions can be life-threatening and can include mouth or facial swelling and anaphylaxis (closing of the throat). If you notice hives, swelling of your lips or tongue, or difficulty breathing after using Nascobal (cyanocobalamin), stop using it and seek medical attention right away.
Not recommended for people with Leber’s disease (a rare genetic eye condition)
People with a rare, inherited eye condition called Leber's disease who received vitamin B12 developed severe eye damage. Vitamin B12 products containing cyanocobalamin, including Nascobal (cyanocobalamin), isn't recommended in people with Leber's disease. If you have Leber's disease, speak with your provider about alternatives for vitamin B12 supplementation (like hydroxocobalamin).
Potential to hide or reveal symptoms of other blood-related health conditions
- Risk factors: Taking more than 10 mcg of vitamin B12 daily
Taking vitamin B12 can sometimes mask anemia due to low folic acid levels). This means that vitamin B12 might help raise your red blood cell count without affecting your folic acid (folate) levels (so your folic acid levels will still be low). Your provider will check your folic acid levels through bloodwork before you start Nascobal (cyanocobalamin) to make sure you receive appropriate treatment for all your nutrient deficiencies.
Treatment with Nascobal (cyanocobalamin) can reveal the signs of a rare blood cancer called polycythemia vera that you might unknowingly have. Contact your provider if notice symptoms of this rare blood cancer, such as headache, dizziness, chest pain, easy bruising, or more frequent or longer bleeding (e.g., gums, nose).
Close monitoring needed for people with severe pernicious anemia
If you have severe pernicious anemia, your provider might follow up with you more often. Sometimes, treating severe pernicious anemia with vitamin B12 can cause low potassium and high platelet levels. These conditions can be serious and life-threatening. Your provider will track your potassium and platelet levels through bloodwork during treatment with Nascobal (cyanocobalamin). Don't use any other vitamin B12 supplement while taking Nascobal (cyanocobalamin) unless your provider specifically instructs you to. Contact your provider if you notice headache, confusion, shortness of breath, heart palpitations (chest pounding), muscle weakness or cramps, or unusual bleeding. These can be symptoms of electrolyte or platelet problems.
Nascobal (cyanocobalamin) dosage
The average cost for 1 carton of 4 devices of 500mcg/spray of Nascobal (cyanocobalamin) is $174.27 with a free GoodRx coupon. This is 68.74% off the average retail price of $557.49. 
Carton
Carton| Dosage | Quantity | Price as low as | Price per unit |
|---|---|---|---|
| 4 devices of 500mcg/spray | 1 carton | $174.27 | $174.27 |
Typical dosage for Nascobal (cyanocobalamin)
The typical dose is 1 spray (500 mcg) in one nostril once per week. Use the medication at least 1 hour before or 1 hour after consuming hot foods or drinks.
Your provider might adjust your dose based on your vitamin B12 levels.
More on Nascobal (cyanocobalamin) dosage
How much does Nascobal (cyanocobalamin) cost?
To access savings, use a GoodRx coupon and pay just a fraction of the retail price.
Nascobal (cyanocobalamin) (generic)
$174.27
Nascobal (cyanocobalamin) contraindications
Contraindications are specific health conditions or situations in which a person should not take a medication due to safety concerns. If you have any of the following conditions or if any of the following apply to you, let your healthcare provider know because Nascobal (cyanocobalamin) will not be safe for you to take.
- Allergy to cobalt or vitamin B12
What are alternatives to Nascobal (cyanocobalamin)?
There are a number of medications that your doctor can prescribe in place of Nascobal (cyanocobalamin). Compare a few possible alternatives below.
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