New Research Shows Vitamin B12 May Hold the Key to Healthy Aging

#1
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#2

The paper: Vitamin B12 Supports Skeletal Muscle Oxidative Phosphorylation Capacity in Male Mice 2026

Cornell University + University of Alabama at Birmingham

Exposure to a−B-12 diet led to uracil accumulation in mtDNA and impaired maximal oxidative capacity in skeletal muscle. B-12 supplementation improved complex IV maximal capacity in gastrocnemius from aged mice, a model of age-related skeletal muscle decline.

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#3

For sure. We can probably make this case for many micro nutrients. However, too much B12 isn’t such a good thing. I aim to keep my level between 400-700 and make sure MMA and Homocysteine are good.

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#4

A similar paper: Vitamin B12 Improves Aged Skeletal Muscle Mitochondrial Biology

#5

I’m a long term B12 advocate but agree that it has to be kept in balance.

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#6

Its not obvious from the summary, but having read the paper a−B-12 means a diet deficient in B-12.

What they are saying is that without enough B-12 there is not enough dTMP (thymine with one phospate) which I assume means a shortage of dTTP (thymine with three phosphates) which means that when mtDNA is copied a uracil base is incorporated instead of a thymine base. That then is recognised to be there in error as U is used in RNA and not in DNA and the enzymes tend to go wrong when copying mtDNA.

We have discussed the issue about misincorporated bases previously although that tended to be from a shortage of pyrimidines more generally. (cytosine, thymine - and uracil, but uracil should be kept for RNA not DNA).

This is an interesting mechanistic argument for high B12 levels.

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#7

Simplistically, the article suggests that as people get older, absorption of vitamin B12 often declines because of: lower stomach acid, reduced intrinsic factor, medications like proton pump inhibitors or metformin and gastrointestinal conditions.

That means older adults can develop low B12 even with a decent diet. This research suggests that in ageing even “low-normal” B12 may impair cellular energy systems, mitochondria in muscle tissue may become less efficient and subtle neurological and metabolic problems may appear before obvious deficiency symptoms.

So, I think the idea is that older adults may benefit from upper / normal B12 rather than merely avoiding severe deficiency. B12 absorption becomes inefficient with age, and higher doses compensate for that but don’t over do it!

It’s worth testing if you have:

  • fatigue
  • numbness/tingling
  • memory decline
  • balance issues
  • anemia
  • vegetarian/vegan diet
  • metformin use
  • long-term antacid/PPI use
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