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White House, TN
A 42-year-old female asked:

How much b-12 should i take?

3 doctor answers6 doctors weighed in
Dr. Dean Giannone
Internal Medicine 26 years experience
What's the reason?: That would depend on the reason? If just for energy and routine assistance with carbohydrate metabolism, then the standard amount on the bottle would suffice. If you're B12 deficient, you might need more.
Dr. Jeffrey Levine
Family Medicine 32 years experience
Depends: The Recommended dietary amounts (RDAs) are 2.4 micrograms daily for ages 14 years and older. If you have B12 deficiency, you may need 125-2,000 micrograms of oral B12/day until your levels normalize. There are also sublingual and intramuscular formulations, which are rarely necessary.
Dr. Katharine Cox
Pediatric Emergency Medicine 46 years experience
B12: Generally B12 can be taken daily by mouth or IM monthly. The dose is 1000 mcg for both. All the best.
Dr. Carlos Faviel font
Family Medicine 12 years experience
You may get a nasal spray and get 500mcg in 1 nostril once per week. This may be an interesting method for those who don't like to take pills on a daily basis. If you're pregnant, or lactating there are doses specific to that as well. The recommended daily amount for adults is rather small 2.4 mcg, therefore supplementation is really for people with deficiency.
May 26, 2017

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Last updated Jun 11, 2017
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