Vitamin B12
Vitamin B12 and Tingling Hands and Feet: Signs, Tests and What Helps
Low vitamin B12 can cause numbness and tingling in the hands and feet, even before anemia shows up. Metformin and acid reducers raise the risk. A blood test tells you if you are low. B12 helps nerve symptoms caused by a deficiency; for other causes, the evidence is thin. NervoMax contains B12 but does not print the amount.
Written by the NervoMax editorial teamUpdated · 8 min read
The short answer
Can low vitamin B12 cause tingling in your hands and feet?
Yes. Vitamin B12 deficiency can cause numbness and tingling in the hands and feet. It can happen even when your blood count is still normal (NIH ODS, Vitamin B12).
Your nerves need B12 to work normally. Body stores can last a long time, so a shortfall often builds slowly over months or years before symptoms show (NIH ODS, Vitamin B12).
Low B12 is one of many causes of nerve symptoms. Diabetes is the leading cause in the U.S. (NINDS, Neuropathy). Too much B6 is another, covered in our post on B6 and nerve damage.
Signs
What are the signs of vitamin B12 deficiency?
Nerve signs and tiredness are the most common. They often creep in slowly (NIH ODS, Vitamin B12).
- Pins and needles or numbness in the feet, legs or hands
- Poor balance, especially in the dark
- Tiredness and weakness, sometimes with anemia
- Memory trouble or low mood
None of these signs proves low B12. They overlap with diabetes, thyroid problems and medicine side effects (MedlinePlus, Numbness).
Risk
Who is most at risk of low B12?
People who absorb less, eat no animal foods, or take certain medicines. Older adults make less stomach acid, which helps free B12 from food (NIH ODS, Vitamin B12).
| Risk | Why it matters |
|---|---|
| Metformin | Long-term use can lower B12 levels (NIH ODS, Vitamin B12) |
| Acid reducers (PPIs, H2 blockers) | Less stomach acid means less B12 freed from food (NIH ODS, Vitamin B12) |
| Age 50 and older | Absorption from food tends to drop (NIH ODS, Vitamin B12) |
| Vegan diet | B12 is found naturally only in animal foods (NIH ODS, Vitamin B12) |
| Stomach or bowel surgery | The parts that absorb B12 may be removed or bypassed (NIH ODS, Vitamin B12) |
Picture a 62-year-old with type 2 diabetes who has taken metformin for years. New tingling could be diabetes, low B12, or both. A simple test helps tell them apart.
Testing
How do you find out if you are low in B12?
A blood test answers it. Your doctor may add a second test if the first result is borderline (NIH ODS, Vitamin B12).
Testing before you buy anything gives your doctor a clear starting number. Follow these four steps.
- 01
Check your medicines
List metformin, acid reducers and any vitamins. Bring the bottles, including NervoMax if you use it.
- 02
Ask for a B12 blood test
Ask your doctor whether a B12 level, and sometimes a follow-up test, makes sense for you.
- 03
Treat the cause you find
If you are low, your doctor picks the dose and form. If you are not, keep looking for the cause.
- 04
Track your symptoms
Write down where it tingles and how strong it feels each week. Recheck with your doctor after treatment.
Food and supplements
How can you get more B12 from food and supplements?
Adults need 2.4 mcg a day. Fish, meat, eggs, dairy and fortified cereals all supply it. No upper limit has been set (NIH ODS, Vitamin B12).
If you absorb poorly, food may not be enough. Doctors then use pills or shots, at a dose they choose for you.
NervoMax lists "Vitamin B12 (as Cyanocobalamin 1%)" in its 600 mg blend. The amount per serving is not printed. That makes it hard to know whether it covers a real deficiency.
See vitamin B12 in NervoMax and the full label.
Evidence
When does B12 help tingling, and when does it not?
B12 helps when a deficiency is causing the tingling. For other causes, a Cochrane review found the evidence too thin to say B vitamins help (Cochrane, B vitamins).
- B12 if lowB12 deficiency causes numbness
Fixing a real deficiency helps. Most people are not deficient. (NIH ODS, Vitamin B12)
- B vitaminsCochrane review: 13 trials
Evidence is insufficient to say B vitamins help nerve pain or tingling. (Cochrane, B vitamins)
- Bacopa9 memory trials
Small gains in attention speed after 12 weeks. Memory, not nerves. (Kongkeaw et al., 2014)
- GinkgoWalking pain trials
No meaningful benefit for leg circulation pain. (Cochrane, Ginkgo 2013)
- NervoMaxNo study of the product
No trial of NervoMax for numbness, tingling or nerve health. (FTC, Health claims)
Bar length shows how directly each line of evidence answers the question: will this blend help my nerves? It is our editorial summary of the linked sources, not a score from any study.
Sources
Where do these B12 facts come from?
Each claim above links to one of these sources. For warning signs, read when numbness needs a doctor.
- Vitamin B12: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements, 2025.RDA 2.4 mcg; no upper limit. Deficiency can cause numbness and tingling in hands and feet, even without anemia. Metformin and acid reducers can lower B12.
- Peripheral Neuropathy. National Institute of Neurological Disorders and Stroke, 2026.More than 100 types. Diabetes is the leading U.S. cause; others include B12 deficiency, alcohol, toxins, chemotherapy and autoimmune disease.
- Numbness and tingling. MedlinePlus Medical Encyclopedia, 2025.Causes include B-vitamin problems, diabetes, carpal tunnel, MS, stroke and medicines. Call 911 for numbness with weakness, confusion, slurred speech or loss of bladder control.
- Vitamin B for treating peripheral neuropathy. Ang CD, et al. Cochrane Database of Systematic Reviews, 2008.13 trials, 741 people. Evidence is insufficient to say whether B vitamins help or harm in neuropathy.
FAQ
Vitamin B12 and tingling: common questions
Can B12 deficiency cause tingling in hands and feet?
Yes. Low vitamin B12 can damage nerves and cause numbness and tingling in the hands and feet, sometimes before any anemia appears. A blood test can confirm it. (NIH ODS, Vitamin B12)
How long does it take for B12 to stop tingling?
No fixed time is published. Recovery depends on how low you were and for how long. Ask your doctor when to recheck, and track your symptoms weekly so you can compare. (NIH ODS, Vitamin B12)
Does metformin cause B12 deficiency?
It can. Long-term metformin use is linked to lower B12 levels. If you take metformin and notice tingling, ask your doctor about a B12 test rather than guessing. (NIH ODS, Vitamin B12)
Will B12 help neuropathy if I am not deficient?
Probably not. A Cochrane review of 13 trials found the evidence insufficient to say B vitamins help neuropathy. B12 clearly helps symptoms caused by a deficiency. (Cochrane, B vitamins)
How much B12 is in NervoMax?
The label does not say. NervoMax lists vitamin B12 as cyanocobalamin inside a 600 mg blend with no individual amounts. Call the order desk at +1 (302) 200-3480 to ask.
Can you take too much vitamin B12?
No upper limit has been set for B12 because it has a low potential for harm. Even so, tell your doctor about every B12 product you take. (NIH ODS, Vitamin B12)
Who wrote this
Written and reviewed by
Plain-language pages built from the bottle label and linked public health sources such as NIH, FDA and Cochrane.
Last updated . Read our editorial standards and how we check reviews. This website is run by Nervomax, a USA authorized NervoMax retailer, not by the manufacturer. We earn money when you buy through our order links.
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