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The recommended daily intake (RDI) for vitamin B12 for people over 14 is 2.4 micrograms (mcg) (1). However, you may want to take more or less, depending on your age, lifestyle, and specific...
Left untreated, a vitamin B-12 deficiency can lead to anemia, fatigue, muscle weakness, intestinal problems, nerve damage and mood disturbances. The recommended daily amount of vitamin B-12 for adults is 2.4 micrograms (mcg). Most people can get enough vitamin B-12 in the foods they eat.
Learn more about VITAMIN B12 uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain VITAMIN B12.
Most people take between 500 mcg and 1,000 mcg of OTC vitamin B12 per day. If you’re unable to absorb vitamin B12 from oral supplements, you may need prescription vitamin B12. It comes as an injection or a nasal spray. In most cases, you’ll inject vitamin B12 daily for a week or so.
Lifelong vitamin B12 supplements may be required at doses between 100 and 1,000 micrograms. As such, "B12 vitamin 1,000 mcg" refers to a high dose (1,000 micrograms) of vitamin B12 suitable for someone with nutrient absorption issues or pernicious anemia.
If your vitamin B12 levels are low, a common recommended OTC dose is about 1,000 mcg daily. But your healthcare provider can advise you about how much vitamin B12 you should look for in a supplement. The amount of vitamin B12 in OTC dietary supplements varies.
Vitamin B12 levels are higher, generally 50–500 mcg, in supplements containing vitamin B12 with other B-complex vitamins and even higher, typically 500–1,000 mcg, in supplements containing only vitamin B12.