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What I Discovered About B12 and "Permanent" Nerve Damage Changed How I Treat Patients
Forever
By Dr. James Whitfield, MBBS, MRCP, FRCP Consultant Neurologist
3,791 Ratings
By Dr. James Whitfield
November 25, 2025
If you're reading this, chances are you've already been told to "learn to live with it."
The burning in your feet at night.
The tingling that creeps up from your toes.
The way your fingertips have gone strange — numb, far-away, like somebody else's hands wearing your rings.
You've sat across from your GP. Maybe more than once. Maybe more than five times. And the verdict is always the same — nerve damage, likely permanent, here's another pregabalin script, "I'm afraid thereisn't much more we can do."
I know that sentence. I've written it on more prescriptions than I care to count.
And for the first twelve years of my career as an neurologist, I had no better answer either.
Until I started looking properly.
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My Patient “Margaret” – And the Case That Changed Everything
Three years ago, a woman I'll call Margaret walked into my clinic.
She was 64. Widowed. A retired secondary school teacher.
She had:
- Burning feet at night, sharp enough to wake her at 3am
- Tingling in both hands that had been there for two years
- Numb fingertips, she could no longer feel her wedding ring when she spun it
- Balance that had quietly started going
- Two "bloodwork is fine" letters from her previous GP
She had been told, in different words by different doctors, the same thing: nothing more to be done.
When I pulled her B12 result, it read 263 pmol/L. The standard UK cutoff is 180. By every standard
clinical protocol, that is "normal."
But here's what they never tell you — the cutoff is wrong.
The British Society for Haematology's 2023 guidelines admit nerve damage can develop well above 400 pmol/L — more than double what the UK calls "normal."
The Pernicious Anaemia Society has fought the threshold for nearly twenty years. Parliament debated it in 2021. And still — women like Margaret are told their bloods are fine while their nerves starve.
I started Margaret on sublingual B12, stacked with thiamine and the full B-complex. Within four weeks,
she could feel her wedding ring again. Within eight, the night burning had stopped.
Her nerves hadn't been "permanently damaged."
What The Research Actually Says
I know what this sounds like. A neurologist who's suddenly found the thing every other doctor has
missed. I didn't believe it myself — not until the patient files started stacking up the same way.
So I went to the literature.
You don't have to take my word for it. Here's what the UK medical establishment already publishes —
quietly, in documents nobody sends home with your prescription:
1. MHRA, June 2022. The Medicines and Healthcare products Regulatory Agency formally reclassified B12 deficiency as a "common adverse drug reaction" of metformin, affecting up to 1 in 10 patients. GPs were specifically instructed to test B12 in any metformin patient presenting with new-onset nerve symptoms.
2. NICE NG239, March 2024. The UK's clinical guideline on B12 deficiency explicitly lists medication-induced deficiency — metformin and long-term PPIs — as a recognised cause.
3. British Society for Haematology, 2014 (updated 2023). Their diagnostic guidelines acknowledge that neurological symptoms can appear before anaemia does, and that a serum B12 result inside the "normal range" does not rule out functional deficiency in nerve tissue.
4. Pernicious Anaemia Society. The UK's leading patient advocacy body has campaigned for over 15 years that the current UK cutoff is set too low. Hansard records show Parliament itself debated widespread under-diagnosis in May 2021.
This is not fringe science. It's mainstream UK medicine. It's just not making it into the ten-minute GP
appointment.
Here's The Worst Part: Most British Women With Nerve
Symptoms Are At Risk — And Don't Know It
In the UK, we've been trained to think B12 deficiency is rare. That it only shows up in vegans,
alcoholics, or pernicious anaemia patients.
That is a dangerous myth.
If you've ever:
- Been over 55 (stomach acid drops with age — B12 can't be released from food properly)
- Taken metformin for type 2 diabetes (blocks B12 absorption in the gut — MHRA confirmed)
- Taken omeprazole, lansoprazole or any PPI long-term (same gut-absorption mechanism)
- Had an old injury, surgery, or long COVID (nerves never got the raw materials to rebuild)
- Had stomach, gut, or bariatric surgery - Been told your serum B12 is "just within range"
Then you sit inside the at-risk population. Millions of British women in their fifties, sixties and
seventies fit more than one of these categories.
And once the deficiency sets in, what happens next is unfortunately predictable:
- The myelin sheath — the fatty insulation around every nerve — starts to thin
- Nerves begin misfiring (this is what tingling, burning and numbness actually are)
- Left long enough, transmission fails altogether
- Drop foot, balance loss, falls, loss of grip strength follow
This isn't a cosmetic inconvenience. This is a woman in her sixties quietly losing her stride.
So I Went Searching for a Solution…
The problem with the standard fix most British women are offered — oral B12 tablets or three-monthly
injections — is that it doesn't fully solve the underlying absorption problem.
Swallowed tablets go through the same compromised gut that caused the deficiency in the first place.
Most of it simply isn't absorbed.
Three-monthly injections hold for a few weeks at most — many of my patients report their symptoms
returning long before the next appointment.
I needed something my patients could take daily, that bypassed the gut entirely, that contained the whole B-complex — not just B12 in isolation — and that was affordable enough to actually continue long-term.
I tested oral tablets. Methylcobalamin lozenges.
Cyanocobalamin (the cheap synthetic form most multivitamins use).
Liquid sprays.
High-dose injections.
Most underdelivered. Some were ridiculously overpriced. A few were actively poor quality.
Then I found what worked.
Introducing Levoria Liquid B-Complex — My Go-To B12 Protocol
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After many years of trialling different formulations, I began recommending Levoria Liquid
B-Complex to my neurology patients.
It's a sublingual drop — placed under the tongue for about 30 seconds before swallowing. Raspberry flavoured. Vegan. Non-GMO. No fillers. Made to pharmaceutical manufacturing standards withglobally-sourced actives
What sets it apart?
Levoria contains the full nerve-support B-complex, in the bioavailable forms:
- Methylcobalamin (Vitamin B12) - 5,000mcg. The direct-use form your body absorbs without
conversion. This is what your body uses to rebuild the myelin sheath around every nerve.
- Thiamine (Vitamin B1). Powers the mitochondria inside the nerve cells themselves. B12 protects the
nerve. B1 fuels it.
- Vitamin B6. Essential for neurotransmitter synthesis and nerve signal transmission.
- Folic Acid. Works alongside B12 in the methylation pathway. The two cannot be separated — without folate, B12 cannot do its job properly.
- Niacin (Vitamin B3). Supports healthy blood flow to peripheral nerves — the hands, the feet, the
fingertips.
Combined, these five nutrients form the full nerve-maintenance stack. Vitamin B12 is authorised in
the GB nutrition and health claims register to contribute to the normal functioning of the nervous
system — which is exactly the process we're trying to protect.
How It Works:
✅ Absorbs through oral tissue directly into the bloodstream — no gut required
✅ Delivers 5,000mcg methylcobalamin, the direct-use form of B12 — no conversion needed
✅ Provides the full B-complex in one daily dose — B12 never works alone in the body
✅ Taken once a day — no injections, no GP appointments, no prescriptions
✅ Raspberry flavoured — easy to stick with for the 8–12 weeks your nerves need
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You Don’t Have to Wait for a Diagnosis
By the time most UK women get a proper B12-deficiency diagnosis, their nerve symptoms have already
been dismissed for two to four years.
If the MHRA itself says 1 in 5 metformin patients are deficient...
if NICE's 2024 guideline lists four separate medication-induced causes...
If the British Society for Haematology says neurological
symptoms can persist above the standard UK cutoff...
If the Pernicious Anaemia Society has been campaigning for 15 years that the cutoff is wrong...
Why wait until the damage sets in?
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Special Limited-Time Offer for New Customers
When we consulted pricing experts on the Levoria formula — pharmaceutical-grade methylcobalamin
at 5,000mcg, the full B-complex, sublingual delivery, independent third-party testing — they
recommended pricing it at £149.95 per bottle.
If you were to buy each active at clinical dosage from a specialist compounder separately, you'd
comfortably spend over £200 per month — B12 injections alone run around £90, before you add
thiamine, B6, folate and niacin.
But that isn't why we created this formula.
Levoria exists because British women in their fifties, sixties and seventies have been dismissed for too
long. The mission is to make proper B-complex support accessible — not another luxury gatekept
behind private prescriptions.
So instead of charging £149.95. Or £79.95. Or even £59.95.
For readers of this article only — Buy 2 Bottles, Get The Third Free. That brings the per-bottle cost
down to just £39.95 — an effective £26.63 per bottle. Roughly 90p per day.
Your 3-bottle order includes:
- 3 full-size bottles of Levoria Liquid B-Complex (3-month supply at daily use) - FREE UK shipping -
60-day money-back guarantee — if you haven't noticed a difference, send back what you haven't used
and we'll refund every penny - No subscription lock-in — this is a one-time purchase, not a hidden
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You will never see Levoria cheaper than this. Once this launch window closes, pricing returns to the
standard £79.95 per bottle.
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Final Thoughts from Dr. Whitfield
As a consultant neurologist, my job has never been just to treat symptoms — it has been to find the root
cause.
B12 deficiency is one of the most overlooked root causes I've ever encountered in a British clinical
population. It hides behind "normal" lab results. It hides behind medication side effects nobody
explains. It hides behind ten-minute GP appointments with no time to investigate.
If you've been told to "learn to live with it"... If you've been handed another pregabalin script... If your
GP shrugged and said the nerve damage is permanent...
Please — before you accept that as the end of the conversation, check the simple thing.
Not because Levoria is trendy. Not because it's popular.
Because for the right woman, with the right deficiency, in the right delivery form — it works.
To your health,
— Dr. James Whitfield MBBS, MRCP, FRCP Consultant Neurologist Harrogate, North Yorkshire