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Vitamin B12 Recommendations

Step 1

If you have a regular source of B12, skip to Step 2. If you have not had a regular source of B12 for some time, buy a bottle of 1,000 µg (or greater) of cyanocobalamin B12 tablets.

Chew 2,000 µg once a day, for 2 weeks. You can break the remaining tablets in half or quarters for Step #2. It's okay to take more than recommended. Then follow the advice under Step #2.

In rare case, someone might have an acne-like response to such large doses of vitamin B12. If that happens to you, skip to Step 2 and opt for one of the lower dose regimens.

Step 2

Notes

Click here for an explanation of how these recommendations were formulated.


References

1. Lower limit based on minimum recommendations in What Every Vegan Should Know about Vitamin B12.

2. In a single dose, B12 absorption drops to 1-1.5% for the amounts above 5 µg.

3. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. Washington, DC: National Academy Press; 2000.

4. Sharabi A, Cohen E, Sulkes J, Garty M. Replacement therapy for vitamin B12 deficiency: comparison between the sublingual and oral route. Br J Clin Pharmacol. 2003 Dec;56(6):635-8. | link