Vitamin B12 Dosage

Vitamin B12 Dosing for Specific Uses
For treating specific conditions, such as a vitamin B12 deficiency or pernicious anemia, much higher doses are recommended. Although it was once thought that injections were the only way to treat a deficiency due to low or absent intrinsic factor, it is now known that oral forms can be just as effective as injectable forms, although much higher doses are required. Small amounts of vitamin B12 can be absorbed after oral consumption, even without any intrinsic factor. Many healthcare providers choose to initially treat with injections to build up the stores of the vitamin in the body, then follow with oral supplementation.
If you have a documented vitamin B12 deficiency, follow your healthcare provider's recommendations for your dosage and the type of vitamin B12 to use. Recommended dosages can vary widely, depending on numerous factors.

General Information on Dosing With Vitamin B12

Some considerations for people taking vitamin B12 include the following:
  • Non-prescription vitamin B12 products are classified as dietary supplements, not drugs. Therefore, they are subject to less rigorous manufacturing standards, compared to drugs. When choosing any supplement, it is important to choose a high-quality product from a trustworthy manufacturer. Your pharmacist is a good resource for information about which manufacturers are most reputable.
  • Never exceed the amount recommended on the supplement label unless your healthcare provider specifically recommends that you do so.
  • If you are unsure about anything related to your dosage or vitamin B12 dosing in general, please talk with your healthcare provider or pharmacist.

More Headlines in Vitamin B12 Dosage

↶ An Introduction to Vitamin B12 Dosages
Last reviewed by: Kristi Monson, PharmD
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