Supplements and metabolism
Benfotiamine and Tingling Feet: What the 2026 Trial Found
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed September 20266 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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Benfotiamine is a fat-soluble form of vitamin B1. It is widely sold for tingling feet. The largest long-term trial, published in January 2026, gave 300 mg twice a day for a year and found no change in nerve measures against placebo. Before spending months on it, it is worth reading your HbA1c, B12 and thyroid numbers.
Find out which numbers to read →As of September 2026, benfotiamine is having a moment. Supplement forums are full of people taking it for pins and needles in the feet. The pitch is appealing. It is a vitamin, it is cheap, and the shop page usually mentions nerves and blood sugar in the same breath.
The evidence took a turn this year, and it went the other way. Here is what changed, and what to do with that.
What is benfotiamine?
Benfotiamine is a fat-soluble version of thiamine. Thiamine is vitamin B1, the nutrient your cells use to turn sugar into energy. Ordinary B1 dissolves in water, so your body absorbs a limited amount and clears the rest.
Benfotiamine is built to get past that ceiling. It raises blood thiamine levels far higher than the standard form. That much is not in doubt. In the 2026 trial below, every one of the six thiamine measures rose in the benfotiamine group.
The theory behind it is that extra thiamine pushes surplus glucose down a safer chemical route, which in animal studies reduced the damage high blood sugar does to small blood vessels. It is a reasonable theory. The question is whether it does anything you can feel.
Does benfotiamine help tingling feet?
The best evidence says no, at least not measurably. Two long randomised trials have now tested it properly, and both came back flat.
The newer one is the BOND study, published on 22 January 2026 in BMJ Open Diabetes Research & Care. Fifty-seven people with type 2 diabetes and nerve symptoms took either benfotiamine 300 mg twice daily or a placebo for twelve months. Neither they nor the researchers knew who got which.
The authors put the finding plainly. Treatment for twelve months “was well tolerated, but had no significant effects on multiple morphometric, neurophysiological and clinical measures of neuropathy”. Nerve fibre length, nerve conduction, sensation testing and quality of life all moved the same in both groups.
An earlier trial found the same thing over longer. In 2012, Diabetes Care reported 24 months of benfotiamine at 300 mg a day in 67 people with type 1 diabetes. Thiamine levels rose sharply. Nerve function did not budge.
One softer signal is worth noting for honesty. In BOND, a symptom score did drift in benfotiamine's favour, but the result did not reach statistical significance. That is a hint, not a finding.
What actually causes tingling feet?
Blood sugar is the leading suspect. The NHS is direct about it: “Diabetes is the most common cause of peripheral neuropathy in the UK.” Peripheral neuropathy is the medical name for nerve damage in the hands and feet.
The NHS also says the risk is higher when blood sugar is poorly controlled, and that up to one in four people with diabetes get some pain from nerve damage. That is the part benfotiamine cannot do for you. It raises a vitamin level. It does not move your glucose control.
The same NHS page lists other conditions behind tingling and numbness. Several are things a blood sample can read:
- Low vitamin B12 or other vitamins.
- An underactive thyroid gland.
- Chronic kidney disease or chronic liver disease.
- Years of heavy drinking.
That list matters. If your tingling is a B12 problem, a year of benfotiamine will not touch it. Our guide on tingling and numbness walks through the wider set.
Which numbers are worth checking first?
Start with HbA1c. It measures how much sugar has stuck to your red blood cells, which gives an average of your blood sugar over roughly the last three months. One reading tells you whether the glucose driver the NHS names is actually present in your case.
HbA1c sits in our Advanced Heart Health panel at £159, alongside ApoB, Lp(a), hs-CRP and the full cholesterol breakdown. It is a blood test, so it measures markers and offers wellness insight. It does not diagnose diabetes, and a result that concerns you belongs with your GP.
After that, two more are worth reading. B12 and folate sit in the Vitamins & Minerals panel. TSH and free T4, the thyroid markers, sit in Thyroid & Vital Organs and in General Energy & Wellness from £149.
One thing benfotiamine will not show up on: thiamine itself. We do not measure B1, and no panel we sell carries it. If a shop implies a blood test will prove your benfotiamine is working, that is not a test we or most UK labs offer routinely.
If you still want to try it, what then?
A flat trial result is not the same as harm. In BOND, side effect rates were no different from placebo across a full year at 300 mg twice daily. It was well tolerated.
So the case against it is cost and delay, not danger. A year is a long time to give something that two trials could not separate from a dummy pill, especially if a treatable cause is sitting unread in your bloods.
If you take it anyway, take a baseline first. Read your HbA1c now, then again after three months, because that is roughly the window HbA1c covers. Our guide on lowering HbA1c covers what genuinely moves it. Never change prescribed medication because of a supplement, and speak to a pharmacist or a qualified clinician if you take anything on prescription.
Ask your blood
Tingling has a short list of readable causes. Start with the numbers rather than the supplement shelf.
Frequently asked questions
Does benfotiamine work for nerve tingling?
The two long randomised trials say no. The BOND study, published in January 2026, gave 300 mg twice daily for twelve months to people with type 2 diabetes and nerve symptoms. It found no significant effect on nerve or clinical measures against placebo. A 24-month trial in Diabetes Care in 2012 reported the same flat result.
Is benfotiamine the same as vitamin B1?
It is a fat-soluble form of it. Vitamin B1 is thiamine, and the ordinary form dissolves in water, so absorption is capped. Benfotiamine gets far more thiamine into the blood. Trials confirm that it raises thiamine levels. They just do not show a matching change in nerve measures.
Can I get my thiamine level tested in the UK?
Not through Helvy. Thiamine is not carried by any of our panels, and it is not a routine test in UK labs. The markers that do sit behind most tingling are HbA1c, vitamin B12, thyroid, kidney and liver, and those we do measure.
Should I check HbA1c if my feet tingle?
It is a sensible first number. The NHS names diabetes as the most common cause of peripheral neuropathy in the UK, and HbA1c reads your average blood sugar over about three months. It measures a marker rather than diagnosing anything, so take a result that worries you to your GP.
Related guides
Tingling and Numbness Blood Test UK
The readable causes behind pins and needles, and which markers sit behind each one.
HbA1c Blood Test UK
Your three-month average blood sugar, the UK ranges, and what they mean.
Vitamin B12 Blood Test UK
Low B12 is on the NHS list of neuropathy causes. Where the ranges sit and what to read alongside.
How to Lower HbA1c
What genuinely moves the number, and how long to wait before a retest is fair.
Berberine for Blood Sugar
A supplement with the opposite evidence problem: a real effect, often oversold.
Underactive Thyroid Symptoms
Another NHS-listed cause of tingling, and the thyroid markers that read it.