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I'm confused... I just bought some B vitamin supplement tablets, and it says on the pack that each tablet contains 2500% the recommended daily allowance of vitamin B12, and that you should take one a day. I have also seen other B12 supplements which contained the same amount. Can anyone explain why they say you're supposed to take 25 times the RDA of B12 every day? Is it harmful to consume too much of it?
 
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i'm pretty sure you take such a high dose tablet because your body doesn't absorb it really well from the tablets, so in actuality you don't get anywhere near that much of it absorbed into your system.
 

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LOL my sublingual B12s have 41,667% of daily RDA. Holy crap! I should probably look this up before I answer because I am totally guessing here, but I think that your body doesn't absorb supplemental B12 as well as dietary... or something? I remember hearing something about the liver and the intestines and... yeah... yeah sure, that sounds about right <img alt="" class="inlineimg" src="/images/smilies/grin.gif" style="border:0px solid;" title=":D"> haha...
 

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<div class="quote-container"><span>Quote:</span>
<div class="quote-block">Originally Posted by <strong>hoodedclawjen</strong> <a href="/forum/post/0"><img alt="View Post" class="inlineimg" src="/img/forum/go_quote.gif" style=""></a><br><br>
i'm pretty sure you take such a high dose tablet because your body doesn't absorb it really well from the tablets, so in actuality you don't get anywhere near that much of it absorbed into your system.</div>
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I'm taking a liquid and its still 2500% of the RDA...<img alt="" class="inlineimg" src="/images/smilies/huh.gif" style="border:0px solid;" title=":confused:">
 

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<div class="quote-container"><span>Quote:</span>
<div class="quote-block">Originally Posted by <strong>Namaste2U</strong> <a href="/forum/post/0"><img alt="View Post" class="inlineimg" src="/img/forum/go_quote.gif" style=""></a><br><br>
I'm taking a liquid and its still 2500% of the RDA...<img alt="" class="inlineimg" src="/images/smilies/huh.gif" style="border:0px solid;" title=":confused:"></div>
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Yeah, even so... I've been told by my doc that supplemental B12 just isn't as efficiently absorbed as what occurs naturally in our food. But I think this is true with any vitamin or mineral - there's something synergistically important about getting it in its naturally occuring state - supplementation just isn't as efficient.
 

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Your body doesn't absorb B-12 very well and it is also a water-soluble vitamin so much of it does get flushed out. Most people taking B-12 in high dosages do it to rebuild their B-12 stores. This is important for veg*ns, especially after being veg*n for several years.
 

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I read that your body absorbs 10-15% of a supplement - the rest goes down the toilet <img alt="" class="inlineimg" src="/images/smilies/toilet.gif" style="border:0px solid;" title=":flush:">
 

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Yes fortunately B-12 is water soluable so you can't overdose on it. The worst that will happen is that your urine will turn a nice shade of green - sign that you're flushing most of that vitamin down the toilet. B-12 is especially important for the elderly, many of whom can't absorb it properly, and vegans who have neglected it for a long time. I would just take the suplement every 3-4 days.
 

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<div class="quote-container"><span>Quote:</span>
<div class="quote-block">Originally Posted by <strong>CherBear</strong> <a href="/forum/post/0"><img alt="View Post" class="inlineimg" src="/img/forum/go_quote.gif" style=""></a><br><br>
I read that your body absorbs 10-15% of a supplement - the rest goes down the toilet <img alt="" class="inlineimg" src="/images/smilies/toilet.gif" style="border:0px solid;" title=":flush:"></div>
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Really? <img alt="" class="inlineimg" src="/images/smilies/shocked.gif" style="border:0px solid;" title=":eek:"> That stuff isn't cheap...
 

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Here's an article of found regarding B12 and a vegan diet: <a href="http://www.veganhealth.org/articles/everyvegan/" target="_blank">http://www.veganhealth.org/articles/everyvegan/</a><br><br><br><br>
Here's a part of the article:<br><br>
"To get the full benefit of a vegan diet, vegans should do one of the following:<br><br><br><br>
1. Eat fortified foods two or three times a day to get at least three micrograms (mcg or mg) of B12 a day or<br><br>
2. Take one B12 supplement daily providing at least 10 micrograms or<br><br>
3. Take a weekly B12 supplement providing at least 2000 micrograms."<br><br><br><br>
Read the article - it's very helpful.<img alt="" class="inlineimg" src="/images/smilies/smiley.gif" style="border:0px solid;" title=":)">
 

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High dosage Vit. B12 sublinqual is meant for people suffering from pernicious anemia. These people have antibodies against intrinsic factor, so that Vitamin B12 cannot bind to this intrinsic factor and therefore isn't actively absorbed. This mechanism is very effective, but after 1-2 µg it's quickly exhausted. You can get some more then by passive absorbtion, which is very ineffective, of 2500 µg only around 0,5% are passively absorbed.<br><br>
If you don't have a problem with intrinsic factor other sources are sufficient. I rely on a supplement, giving me around 5 µg daily right now .
 
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