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Vitamin B12

Cyanocobalamin, another name for vitamin B12, is an FDA-approved medication for treating B12 deficiency and pernicious anemia. It is available in different forms and strengths. It works by producing red blood cells and energy. The medication dosage is based on the condition being treated and the patient’s needs. For personalized advice and guidance, consult a licensed healthcare provider and buy Vitamin B12 online from trusted and reliable sources to ensure your medication is safe. 

Product Overview

Vitamin B12, also known as cyanocobalamin, is an FDA-approved medication used to treat B12 deficiency and pernicious anemia. It helps in the production of RBC & energy, ensuring proper tissue function and overall health. It is available in tablet, extended-release, sublingual, and injectable forms in various strengths, including 100 mcg to 2500 mcg. 

Adults and pregnant or breastfeeding women can take it as a healthcare provider directs. Remember that vitamin B-12 supplements are generally safe when taken appropriately. Excess amounts are excreted through urine. Common side effects include diarrhea, nausea, palpitations, dizziness, and fatigue. If you miss a dose, you should take it as soon as remembered, but do not double up. 

Overdose symptoms may include vomiting/nausea and headache; seek medical attention if necessary. Store Vitamin B12 at a controlled temperature in a cool, dry place away from children and pets. If you have concerns regarding medication usage, consult a licensed healthcare professional for personalized guidance and buy Vitamin B12 from reliable sources to ensure safety.

Uses of Vitamin B12

It is used in treating

  • Vitamin B12 deficiency
  • Pernicious Anemia

Benefits of Vitamin B12

  • It aids in keeping your blood and nerve cells in the body healthy and helps in the production of DNA.
  • It also guards against megaloblastic anemia, a blood disorder that leaves patients exhausted and weak.

Side Effects of Vitamin B12

Common side effects caused by Vitamin B12 are as follows:

  • Nausea or poor appetite
  • Palpitations and rapid heartbeat
  • Light-headedness and dizziness
  • Shortness of breath
  • Sore tongue with redness and beefy texture 
  • Weakness and fatigue
  • Weight loss
  • Yellowish tinge to the skin and eyes

[Note: This list is not exhaustive; if you notice any other symptoms not mentioned above, consult your doctor immediately.]

Vitamin B12 Dosage

Forms & Strengths

Form: Tablet

Strength: 100 mcg, 250 mcg, 500 mcg and 1000 mcg

Form: Tablet, extended-release

Strength: 1000 mcg

Form: Tablet, sublingual

Strength: 2500 mcg

Form: Injectable solution

Strength: 100ml

Recommended Dosages

For Adults under the age of 50
  • The recommended dose is 2.4 mcg daily. 
For Adults over the age of 50
  • Oral form: The recommended dosage typically ranges from 25 mcg to 2000 mcg, and it is taken orally by mouth daily.
  • Sublingual Tablets:  A daily dosage of 1500 mcg or 2500 mcg is advised to prevent B12 deficiency.
For Pregnant Women 
  • The recommended dose of vitamin B12 for pregnant women is 2.6 mcg
For Breastfeeding Women 
  • The recommended dose of vitamin B12 for nursing women is 2.8 mcg
For improved energy
  • A month of 1 mcg of vitamin B12 is recommended to improve energy levels. 

How to Take Vitamin B12?

  • Before using this medication, carefully read and follow the instructions on your prescription label. 
  • Take Vitamin B12 exactly as directed by your doctor with a full glass of water. 
  • If you take Vitamin B12 in tablet form, do not crush, chew or break it. Swallow the tablet as a whole. 
  • While using an oral solution, use a specifically marked dropper or spoon to measure each dose precisely. 
  • Tell your physician, pharmacist, or healthcare provider if you don’t have a measuring spoon or dropper. 
  • You may take vitamin B12 with food to get the best medication results.
  • Do not take Vitamin B12 more than prescribed, in large quantities or more frequently. 
  • Do not share this medication with others, even if they have the same symptoms as you. 

Missed Dose 

If you have missed a dose of Vitamin B12, you should take it as soon as you remember. However, if it is almost time for your next dose, you may omit the missed one and continue as per your daily dosage schedule. Do not simultaneously take two or extra doses to compensate for the missed dose. If you skip an injection, your body’s levels of vitamin B12 may drop even further, which could make your health problems worse. To find out when you should take your next dose, speak with your doctor or nurse if you have to miss an appointment.

[Note: Do not take two doses of Vitamin B12 at the same time to compensate for a missed dose. This can increase your risk of experiencing unwanted side effects.]


Taking cyanocobalamin tablets more than recommended is generally not considered to be harmful. However, if you have consumed more than two 1000 mg tablets of cyanocobalamin or, if you have taken an additional dose and are experiencing nausea/ vomiting, headache, diarrhea, or if you suspect any unwanted side effects, you should talk to your doctor. If you are experiencing severe side effects, you can call 911 or head to the nearest emergency room. 

[Note: If you notice you have taken too much medication, call your local emergency number immediately.]

How Does Vitamin B12 Work?

Vitamin B-12, also known as cobalamin, plays several essential roles in the body. It is crucial for the synthesis of red blood cells (RBC), which distribute oxygen throughout the body, ensuring proper tissue function and overall health. It aids in cell metabolism, energy production, and the breakdown of nutrients by converting carbohydrates into glucose. Vitamin B-12 supports nerve function by maintaining healthy nerve cells and myelination, preventing nerve damage. It is also necessary for DNA synthesis, contributing to the formation of DNA molecules inside cells.

Important Safety Precautions

  • Vitamin B12 is usually considered safe for most people to use when taken by mouth or applied to the skin. 
  • Vitamin B12 taken in the prescribed amounts during pregnancy or breastfeeding is considered safe. 
  • You should avoid using Vitamin B12, Vitamin B6, and folate after getting a coronary stent. When used in combination with these drugs, they may increase the risk of blood vessel narrowing. 
  • You should not use this medication if you have an allergy or sensitivity to cobalamin or cobalt. 


  • Keep Vitamin B12 at a controlled temperature between 20° and 25°C.
  • Keep it in its original container in a dark, cool, and dry place, away from moisture, direct sunlight, and excess heat.
  • Keep all medication, including Vitamin B12, in a safe place away from the sight and reach of children and pets.
  • Do not keep medications that are outdated or no longer needed. Discard it safely. 
  • For more information on properly disposing of unwanted medications, consult your pharmacist, healthcare provider, or local waste disposal company. 

Vitamin B12 Interactions

  • Aminosalicylic acid
  • Colchicine (Colcrys, Mitigare, Gloperba)
  • Metformin (Glumetza, Fortamet, and others) 
  • Proton pump inhibitors, such as lansoprazole and omeprazole.
  • Vitamin C (ascorbic acid)

[Note: This list of interactions isn’t complete. Talk to your doctor if you notice any interaction with food, over-the-counter drugs, prescriptions, or supplements.]

Vitamin B12 Alternatives

  • Nascobal (cyanocobalamin/nasal)
  • Cobolin-M, Depo-Cobolin, Vibal, Cyanoject, Cobal (cyanocobalamin)
  • Hydroxocobal, Hydrocobex (hydroxocobalamin)
  • Mecobalamin, Methyl-B12, Methylcobal, Mecovon (methylcobalamin) 
  • Adocbl, Adenosyl-B12, Dibencozide (adenosylcobalamin)


[Note: Your healthcare provider will choose which Vitamin B12 alternative is best for you. Taking or consuming them by yourself may cause serious side effects.] 

Frequently Asked Questions

What are the possible consequences of long-term Vitamin B12 deficiency?

Long-term Vitamin B12 deficiency can lead to serious health issues such as neurological changes, including difficulty walking, memory loss, numbness and tingling in the hands and feet, and cognitive decline. It can also result in megaloblastic anemia, characterized by fatigue, weakness, and pale skin. To stop permanent harm, early detection and treatment are crucial. 

Can Vitamin B12 supplementation improve mental health and cognitive function?

Evidence suggests that Vitamin B12 plays a crucial role in brain health and cognitive function. Cognitive impairments, anxiety, and depression have all been related to vitamin B12 deficiencies. Supplementing with Vitamin B12, especially in deficient individuals, may help improve mood, reduce symptoms of depression, and enhance cognitive function, although more research is needed to establish definitive benefits.

How does Vitamin B12 interact with other medications, and what precautions should be taken?

Vitamin B12 can interact with several medications, including metformin, proton pump inhibitors, and certain antibiotics, potentially reducing its absorption and effectiveness. Individuals taking these medications should monitor their Vitamin B12 levels regularly and may require supplementation. It’s important to consult a healthcare provider for personalized advice on managing these interactions.

What are the differences between the various forms of Vitamin B12 supplements, and which is the most effective?

There are several forms of vitamin B12 supplements that can be found: adenosylcobalamin, hydroxocobalamin, methylcobalamin, and cyanocobalamin. Cyanocobalamin is the most commonly used form due to its stability and cost-effectiveness. Methylcobalamin and adenosylcobalamin are active forms that may offer better absorption and utilization in the body. Hydroxocobalamin is often used in an injectable form to treat severe deficiencies. The supplement choice should be based on individual needs, absorption capabilities, and recommendations from a healthcare provider.

Our Guarantee

At Arctic Meds, we guarantee that you will find the most competitive prices for purchasing Vitamin B12 through our platform. As the best Canadian online pharmacy, we are committed to delivering only the highest quality products. Each order is fulfilled through a reputable and licensed Canada pharmacy online, ensuring that every product we ship meets stringent standards of quality and authenticity. Our reliable service ships your medications directly from Canada right to your doorstep. For seamless access to buy Vitamin B12 online from Canada at a low price contact us.


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