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Heart and metabolic · Nerves

Tingling feet: test first, then what the supplement trials show

Pins and needles, burning or numbness in the feet is often an early sign of nerve damage, and the cause matters more than any supplement. The most common causes are high blood sugar and low vitamin B12, both found with simple blood tests. Here is the testing checklist, and what the supplement trials actually found.

By Kymata Health Editorial Sources cited inline Prices checked Oct 29, 2026

Quick answer

The quick answer

  • See a clinician first. Tests for blood sugar (HbA1c), vitamin B12, thyroid function and kidney function find the most common causes.
  • Long-term metformin and acid-reducing medicines lower B12. Correcting a deficiency is standard care; oral B12 raised levels about as well as injections.
  • Alpha-lipoic acid improved burning and stabbing foot symptoms over 5 weeks in trials, but the Cochrane review found probably little or no effect at 6 months.
  • Benfotiamine improved one symptom score in a small trial; later trials found no change in nerve function.

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Story

A story you might recognize

Composite story built from common reader accounts; details changed. Not a testimonial.

She is 61 and has taken metformin for type 2 diabetes for nine years. Lately her feet burn at night and feel like she is walking on cotton. An online ad promised a "nerve support formula" would fix it in weeks.

Her doctor ordered blood tests first. Her B12 was low, a known effect of long-term metformin. With B12 replacement, better glucose control and foot checks, the burning eased over several months. The ad’s formula, it turned out, was mostly the same B vitamins at a mark-up.

In depth

Common causes to rule out

Sudden weakness, numbness spreading up the legs, loss of bladder or bowel control, or symptoms on one side of the body need same-day medical care.

  • Diabetes or prediabetes (the most common cause in the US).
  • Low vitamin B12, including from long-term metformin, acid-reducing medicines, weight-loss surgery, a vegan diet or pernicious anemia.
  • Underactive thyroid, kidney disease and heavy alcohol use.
  • Some chemotherapy and other medicines, and too much vitamin B6 from supplements.
  • Less often: autoimmune, inherited or compressive nerve problems.

The plan

The plan

  1. Get tested. HbA1c, B12 (with methylmalonic acid if borderline), thyroid and kidney tests.
  2. Correct what is found. B12 replacement for a deficiency; glucose control for diabetes, which also protects nerves over time.
  3. Protect your feet. Daily foot checks, good shoes and a podiatry visit if you have diabetes and numbness.
  4. Consider a supplement trial with your clinician. Alpha-lipoic acid for symptoms, judged at 5–8 weeks. Stop if it does not help.
  5. Check B6 intake. Excess vitamin B6 from supplements can itself cause tingling; check the labels of everything you take.

The stack

The test-first nerve stack

B12 only if a test shows it is low, alpha-lipoic acid for a time-limited symptom trial, and benfotiamine as an optional extra. Evidence grade: A strong · B moderate · C limited · D preliminary.

  1. 01

    Vitamin B12 (only if low)

    Corrects a shortfall that can cause tingling and numbness on its own. Testing comes first.

    What the research shows: In a 1-year trial of 90 people with diabetic neuropathy on long-term metformin, oral B12 raised levels and improved nerve tests and pain scores. A trial in older adults with low B12 found no effect on nerve function. Oral B12 at high doses raised blood levels about as well as injections in the Cochrane review. Graded D for nerve symptoms; correcting a measured deficiency is standard medical care. (PMID 33513879, PMID 29543316, PMID 26900641)

    • Very safe; no upper limit has been set.
    • Long-term metformin and acid-reducing medicines (PPIs, H2 blockers) lower B12. If you take them, ask about testing.

    In the studies

    • Trials in people with low B12 mostly gave 500–2,000 mcg a day by mouth; the diabetic-neuropathy trial gave 1,000 mcg a day for a year.

    A record of what researchers gave, in whom; not a dose for you.

    Evidencepreliminary (Grade D)

    Quick pick · Supersmart

    Brands that pay us are shown first in this list.

    Methylcobalamin Supplement

    1 tablet: 1,000 mcg vitamin B12 as methylcobalamin; 100 servings

    $20price checked Oct 11, 2026 on Supersmart’s site

    One-time
    $20
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    $17

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    Sign up for the newsletter at the bottom of us.supersmart.com; Supersmart says the 5% discount is permanent.

    Subscribe & Save 15% (20% with 3+ items). Choose Subscribe & Save on the product page; delivery every 1 to 6 months, cancel or change anytime, free shipping on subscriptions.

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    • Supersmart’s footer offer reads “Subscribe to our newsletter and obtain a 5% permanent discount.”
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    • Offer terms from Supersmart’s site, checked Oct 16, 2026. Offers can change; the brand's checkout is final.

  2. 02

    Alpha-lipoic acid

    Short-term relief of burning and stabbing foot symptoms in some trials; long-term benefit is doubtful.

    What the research shows: In 181 people with diabetic neuropathy, all three doses improved foot symptom scores more than placebo over 5 weeks. But the 2024 Cochrane review found probably little or no effect on symptoms at 6 months or longer, and a 4-year trial found no change in nerve tests. (PMID 17065669, PMID 38205823)

    • Nausea, vomiting and vertigo rose with dose in trials.
    • Can lower blood sugar; monitor more closely if you take diabetes medicines.
    • Rare autoimmune low blood sugar (insulin autoimmune syndrome) has been reported, mostly in people of East Asian descent.

    In the studies

    • The SYDNEY 2 trial gave 600, 1,200 or 1,800 mg once daily for 5 weeks; 600 mg gave the best balance of benefit and side effects.

    A record of what researchers gave, in whom; not a dose for you.

    Evidencemoderate (Grade B)

    Quick pick · Botanic Choice

    Brands that pay us are shown first in this list.

    Botanic Choice Alpha Lipoic Acid, 250 mg, 30 capsules

    1 capsule: 250 mg alpha-lipoic acid; label directions 1 capsule twice daily

    $15price checked Oct 12, 2026 on Botanic Choice’s site

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  3. 03Optional

    Benfotiamine

    Optional: one positive symptom score in a small trial; later trials found no change in nerve function.

    What the research shows: In 165 people with diabetic neuropathy, benfotiamine improved one symptom score (the Neuropathy Symptom Score) but not another (the Total Symptom Score). Two later trials, one over 2 years, found no change in nerve function or nerve fibres. (PMID 18473286)

    • Well tolerated in trials up to 2 years. Thiamine has no upper limit.

    In the studies

    • The BENDIP trial gave 300 or 600 mg of benfotiamine a day for 6 weeks.

    A record of what researchers gave, in whom; not a dose for you.

    Evidencelimited (Grade C)

    Quick pick · Supersmart

    Brands that pay us are shown first in this list.

    Benfotiamine

    4 capsules: 320 mg benfotiamine (80 mg per capsule); 30 servings

    $27price checked Oct 11, 2026 on Supersmart’s site

    One-time
    $27
    Subscription
    $22.95

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Listed picks above total $62 at one-time prices on the brands' own sites; most hold about a month of servings at the label's serving size.

Left out

What we left out, and why

"Nerve support" formulas
Most combine B vitamins, alpha-lipoic acid and herbs at doses that rarely match trials, and some contain high vitamin B6, which can itself cause nerve symptoms.
High-dose vitamin B6
High-dose vitamin B6 taken for months has caused nerve damage, and symptoms have been reported below the US upper limit of 100 mg a day. Check the B6 in every product you take, including energy drinks and multivitamins.

Safety

Safety and interactions

  • New numbness or tingling needs a clinician and blood tests before supplements.
  • Alpha-lipoic acid can lower blood sugar; monitor if you take diabetes medicines.
  • Excess vitamin B6 can cause nerve symptoms; check every label you take.
  • Supplements are an addition to, not a replacement for, prescribed medicines. Never stop or change a blood-pressure, cholesterol or diabetes medicine without your prescriber.
  • Not medical advice. Check with your clinician or pharmacist before starting supplements if you take prescription medicines, are pregnant or breastfeeding, or have kidney or liver disease.
  • Supplements are not evaluated by the FDA to diagnose, treat, cure or prevent any disease.

Questions

Frequently asked questions

What causes tingling in the feet?

Diabetes and prediabetes are the most common causes in the US, followed by low vitamin B12, thyroid and kidney problems, alcohol, some medicines and too much vitamin B6. Blood tests find most of these.

Does metformin lower B12?

Yes. In the Diabetes Prevention Program Outcomes Study, long-term metformin use was linked to B12 deficiency. People on metformin should ask about periodic B12 testing.

Does alpha-lipoic acid help neuropathy?

In the 5-week SYDNEY 2 trial (PMID 17065669), 600 mg a day improved burning and stabbing foot symptoms. The 2024 Cochrane review found probably little or no effect on symptoms at 6 months or longer.

Is benfotiamine good for nerve pain?

One small trial found improvement in one symptom score but not another, and later trials found no change in nerve function. The evidence is limited.

Sources

Sources

Studies were checked on PubMed on Oct 31, 2026. Product prices come from each brand's own site, read on Oct 29, 2026; each product shows the date its price was read.

  1. 1Aroda VR et al. Long-term metformin use and vitamin B12 deficiency in the Diabetes Prevention Program Outcomes Study. J Clin Endocrinol Metab 2016 (opens in new tab)PMID 26900641
  2. 2Wang H et al. Oral versus intramuscular vitamin B12 for vitamin B12 deficiency (Cochrane review). Cochrane Database Syst Rev 2018 (opens in new tab)PMID 29543316
  3. 3Didangelos T et al. Vitamin B12 supplementation in diabetic neuropathy: 1-year randomized, double-blind, placebo-controlled trial. Nutrients 2021 (opens in new tab)PMID 33513879
  4. 4Ziegler D et al. Oral alpha-lipoic acid and symptomatic diabetic polyneuropathy: the SYDNEY 2 trial. Diabetes Care 2006 (opens in new tab)PMID 17065669
  5. 5Baicus C et al. Alpha-lipoic acid for diabetic peripheral neuropathy (Cochrane review). Cochrane Database Syst Rev 2024 (opens in new tab)PMID 38205823
  6. 6Stracke H et al. Benfotiamine in diabetic polyneuropathy (BENDIP): randomised, double-blind, placebo-controlled study. Exp Clin Endocrinol Diabetes 2008 (opens in new tab)PMID 18473286

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Educational only. Not medical advice.

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