Vitamin B-12

[Huh?]

Rubber-glue there, Your Puffiness-- I'm in the 99.99% of Aerobic Fitness, so try a little harder there, Bacon-Butt.

Oh, I am sorry to hear you are so far down. I was in the top 1% the last time I was tested. I can't imagine being at 99.99%. Work on it and you can get off the bottom of the bracket. Or at least get to 99.00%.

But don't overdo it and make sure your doctor approves whatever exercise program you go on. Since you are in such bad shape you want to be very careful not to have a heart attack or stroke. Take it easy.

I started training January 2 for the Columbia City Classic in October. Today is a rest day for me and I will take the whole month of May off for some vacation travel. I don't want to overtrain so the break will be good and I will still have enough time to train for the October Classic.

So you be careful and don't overtrain either. Strength and endurance are not built by exercise. They are built by nutrition and sleep. But it sounds like you don't have any problem with the nutrition part Fat Boy.

[Huh?]

There are some people on here who check a prune before they eat it.

What do you mean by that?

[Krelvin]

High levels of vitamin D is suspected of increasing mortality rates

http://www.sciencedaily.com/releases/20 ... 105222.htm

[Chevie]

High levels of vitamin D is suspected of increasing mortality rates

http://www.sciencedaily.com/releases/20 ... 105222.htm

Wait a minute tiger.

1.

Whether this was a causal or associational finding cannot be determined from our data.

and 2. it is unknown whether the "high" levels of D were among people who supplemented or people who did not supplement.

The same two statements can be made about "low" levels.

[Morbius]

And not even the least bit curious:

[Morbius]

...vitamin D ...

That's actually a misnomer, as "vitamin" D is really a hormone...

[49er]

High levels of vitamin D is suspected of increasing mortality rates

http://www.sciencedaily.com/releases/20 ... 105222.htm

I found this exert interesting.

If your vitamin D level is below 50 or over 100 nanomol per litre, there is an greater connection to deaths. We have looked at what caused the death of patients, and when numbers are above 100, it appears that there is an increased risk of dying from a stroke or a coronary. In other words, levels of vitamin D should not be too low, but neither should they be too high. Levels should be somewhere in between 50 and 100 nanomol per litre, and our study indicates that 70 is the most preferable level," Peter Schwartz states.

Interestingly, my level was 60 and my PCP thought that 30 was adequate and that I should cut back. I feel better when I take 2000 to 3000 IU which has been my steady dose. Hmm.

[Jay Aitchsee]

The Vitamin D Council suggests a serum Vitamin D level of 50 ng/ml as ideal, not to exceed 100 ng/ml. The VDC also reports levels greater than 150 ng/ml are toxic, another reason to test before taking supplements willy-nilly. ($58 Walk in Lab)

[JimP]

. . . The only way to get B12 naturally is by eating meat and other animal products.

I wonder how much meat and what kind. I love beef!

Don't worry. Flies are an excellent source of B-12.

hehe

[Paralel]

From the Institute of Medicine:

http://www.nal.usda.gov/fnic/DRI/DRI_Ta ... ements.pdf

There is no currently defined upper intake limit for B12, which is usually a good sign it is nothing to be terribly concerned about.

[DeadlySleep]

nothing to be terribly concerned about

Would you mind if I maintained a level of moderate concern?

While continuing with my morning espresso with Kahlua, of course?

[Relieved_Rita]

One's B12 status is a challenge to measure. High levels might actually be a reflection of poor absorption of B12.
Some practitioners measure methymalonic acid as an indicator of B12 status.

You can find lots of information about B12 by functional medicine practitioners.

[Paralel]

Given the nature of blood tests, if its in your blood, it has been absorbed, now conversion to active metabolites, that's a different story, but as far as absorption goes, if you have high levels in your blood, absorption is not an issue. If you weren't absorbing it, it wouldn't' be in your blood to start with, since humans cannot synthesize Vitamin B12 de novo (which is why a truly strict vegan diet without supplementary Vitamin B12 is 100% fatal if done for an extended period of time)

[Paralel]

nothing to be terribly concerned about

Would you mind if I maintained a level of moderate concern?

While continuing with my morning espresso with Kahlua, of course?

To each their own, but I'm sure you can find things of actual import of which to be moderately concerned, if you need something with which to be moderately concerned.

[Jay Aitchsee]

Are you just trying to scare people? Yes, it is in the link you provide, but all those cautions are related to people with health problems that are specified. And one of the cautions is a concern that you might not absorb enough of B-12 supplement you are taking.

I stand by my first post in this thread:

Take an amount which will keep your serum level at 500-900 pg/mL.
500 mcg/day does it for me.
Reference

Why in the world would you take more of anything than you needed (or something you didn't need) - especially without being aware of the cautions?

And another reason to take only what you need:

https://www.yahoo.com/health/dietary-su ... 26432.html
Warning: Too Many Dietary Supplements May Increase Cancer Risk