Join FREE Newsletter

My Account Logout Contact Us Subscribe Now! Login Contact Us
Home Product Tests  Warnings  Encyclopedia News Where to Buy
 
 

ConsumerLab.com Answers  

Question:
Can taking too much vitamin B-12 be dangerous? The label on my B-complex states it contains 50,000% the Daily Value!

Answer:
If your B-complex contains 50,000% of the Daily Value (DV), which is 6 mcg for adults, then it has 3,000 mcg of B-12. For people without a severe B-12 deficiency, this is certainly more than necessary.  

Taking some B-12 is advisable for people over the age of 50 (when you're less able to extract B-12 from food), as well as for those taking medications that interfere with B-12 absorption, strict vegetarians, alcohol and drug abusers, people recovering from surgery or burns, and those with bowel or pancreatic cancer.  

Although vitamin B-12 is generally considered to be safe, and no "Upper Tolerable Intake Level" has been established, there are some reports of doses of 20 mcg per day or higher causing outbreaks of acne and rosacea. There is also a study which showed that a high-dose B complex supplement (with 1,000 mcg of B-12) hurt, rather than helped, people with type 1 or type 2 diabetes and advanced kidney disease, resulting in a worsening of kidney function and an increase in the risk of heart attack, stroke and death.  

In women who are pregnant, excessive blood levels of vitamin B-12 have been associated with an increased risk of autism in their child.

In general, it's best to avoid excessive doses of any vitamin if it is not needed.

Get more information, including the Recommended Daily Allowance for B-12 (by age and gender), differences in the forms of B-12, potential side-effects and drug interactions, plus ConsumerLab.com's tests of popular products, in the B Vitamin Supplements Review >>

You can check the recommended intakes of other vitamins and minerals here.

Also see the CL Answer "Can taking too much vitamin B-6 be dangerous?"


See other recent and popular questions >>
COMMENTS



Share your thoughts and comments about this topic in the space below. Please abide by the following rules:
  • If you make a statement of fact, such as whether a type of treatment does or does not work, state your basis -- such as personal experience or a published study.
  • If you make a positive or negative comment about a product, note whether or not you have a financial interest in the product or in a competing product.
  • Please be respectful in your tone.
  • Please do not submit any type of HTML markup or scripting as it will not be accepted.
Comment:

Share your thoughts and comments about this topic in the space below. Please abide by the following rules:
  • If you make a statement of fact, such as whether a type of treatment does or does not work, state your basis -- such as personal experience or a published study.
  • If you make a positive or negative comment about a product, note whether or not you have a financial interest in the product or in a competing product.
  • Please be respectful in your tone.
  • Please do not submit any type of HTML markup or scripting as it will not be accepted.
Comment:

You can modify your comment below. Please be aware the comment will have to approve the changes before they will be shown:
Comment:

Your edit has been submitted and is being reviewed by ConsumerLab.com prior to publication.
 
Popular Reviews


ConsumerLab.com Encyclopedia

In addition to our product reviews our encyclopedia covers the following:

Follow us on...


Follow ConsumerLab.com on Twitter    |     Become a Fan on Facebook
Join | Sign In
Home | Product Tests | Brands Tested | Health Conditions | Encyclopedia | CL Answers | Clinical Updates | Where to Buy Products
News | Recalls & Warnings | RDAs | Raw Materials Tests | Testing Programs | The CL Seal | CL Survey | About Us
In The News | Group Subscription | Gift Memberships | Join Free Newsletter | Privacy Policy | Site Map | Testimonials | Contact Us/Help

©2017 ConsumerLab.com, LLC. All rights reserved. A single copy of a report may be printed for personal use by the subscriber.
It is otherwise unlawful to print, download, store or distribute content from this site without permission.
ConsumerLab.com name and flask logo are both registered trademarks of ConsumerLab.com, LLC.
This site is intended for informational purposes only and not to provide medical advice.