Vitamin B12 Methylcobalamin by Life Extension

The verdict. At six dollars for a hundred lozenges this is one of the genuinely good buys on the shelf — for the specific groups who need it. Everyone else is buying an expensive way to make their urine more interesting.

Who this is for

• You are vegan or vegetarian. B12 occurs naturally only in animal foods; this is not a preference, it is chemistry, and deficiency here is common and serious.
• You take metformin, or a long-term acid reducer like omeprazole. Both meaningfully reduce B12 absorption, and this is under-flagged by prescribers.
• You are over sixty. Stomach acid production falls with age, and B12 needs acid to be released from food.

Who should skip it

If you eat meat, fish, eggs or dairy regularly and have no absorption issue, you almost certainly do not need this — the liver stores years' worth of B12. The important exception cuts the other way: if you have symptoms of deficiency, do not self-treat. Numbness or tingling in hands and feet, unexplained fatigue, memory changes or balance problems warrant a blood test, because B12 deficiency can cause nerve damage that becomes permanent if it goes unaddressed — and because folate supplementation can mask a B12 deficiency while the neurological damage continues. That last point is the single most important thing on this page.

What's actually in it

500 mcg of methylcobalamin per lozenge, 100 lozenges. Two things decide value here. First, the form: methylcobalamin is the biologically active form, as against cyanocobalamin, which the body must convert. In practice cyanocobalamin is well absorbed and cheaper, and the difference matters most for people with certain genetic variants — so this is a modest, real upgrade rather than the transformative one it is sold as. Second, the format: it is a lozenge you dissolve under the tongue. That matters much more than the form does, because sublingual absorption bypasses the stomach entirely — which is precisely the step that is broken in older adults and in people on acid reducers.

What the research actually looks at

B12 is unambiguously essential: it is required for red blood cell formation, DNA synthesis, and the myelin sheath around nerves. Deficiency is well characterised and correcting it works. What the evidence does not support is B12 as an energy supplement for people who are not deficient — the "B12 shot for energy" is one of the more durable myths in wellness, and controlled trials do not find a benefit in people with normal levels. Sublingual and oral high-dose B12 have been shown to raise blood levels about as effectively as injections in most people, including many with pernicious anaemia, which is genuinely useful to know before paying a clinic.

How we'd use it

Dissolve one under the tongue and let it sit — do not chew and swallow, which throws away the entire reason for the format. Morning is sensible; a minority find B12 mildly stimulating. It is water-soluble with no established upper limit, so the excess is simply excreted; that makes it safe, and it also makes megadoses pointless.

The honest trade-offs

• Most people buying this do not need it. We would rather say that than sell you a hundred lozenges.
• It can mask a problem. Supplementing before testing can normalise your bloodwork while an underlying absorption disorder goes undiagnosed.
• Methylcobalamin is a small upgrade, not a large one. The sublingual format is doing most of the work.

Bottom line

Cheap, well-formulated, and genuinely important if you are vegan, over sixty, or on metformin or an acid reducer. If you are none of those and you feel fine, put the six dollars somewhere else — and if you feel unwell, get tested rather than guessing.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Nothing here is medical advice — suspected B12 deficiency should be confirmed by a blood test and managed by a qualified professional.