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B12 and nerve symptoms

Vitamin B12 deficiency neuropathy: get tested, not guessed

Quick answer

Vitamin B12 deficiency neuropathy is real: NIH says a B12 shortage can cause numbness and tingling in the hands and feet, even without anemia. Older adults and people on metformin or acid reducers are at higher risk. A blood test is the way to know, and B12 is not one of the six ingredients in Flow Nerves.

Written by the Flow Nerves label deskUpdated · 5 min read

Designed cover graphic of branching nerve strands in navy and teal
A designed cover graphic of nerve strands; it is an illustration, not a result.

The link

Can a vitamin B12 deficiency cause neuropathy?

Yes. NIH says a B12 shortage can cause numbness and tingling in the hands and feet without anemia, and NINDS lists B12 deficiency among the causes of peripheral neuropathy (NIH ODS, Vitamin B12) (NINDS, Peripheral neuropathy).

We cite no fuller symptom list, so see a clinician for lasting numbness or tingling. NIH names these higher-risk groups:

Higher risk of low B12, per NIH
GroupWhy it matters
Older adultsNamed as at risk
People who eat few or no animal foodsNamed as at risk
Pernicious anemia, stomach or bowel conditions or surgeryAbsorption can be affected
Metformin or acid reducersCan lower B12 absorption

Test or guess

Should you ask for a B12 test?

Yes, if you have lasting tingling or numbness and any risk factor above. A B12 test through your clinician beats guessing.

The RDA is 2.4 mcg for adults and NIH sets no upper limit (NIH ODS, Vitamin B12). Do not self-dose. If you take metformin or an acid reducer, ask your clinician or pharmacist about B12, and never stop or change a prescribed medicine yourself.

Check yourself

Which groups should ask before any nerve supplement?

Anyone who answers yes should ask a clinician or pharmacist first. Mayo Clinic says to seek medical care right away for tingling, weakness or pain in your hands or feet (Mayo Clinic, Peripheral neuropathy).

1. Are you under 18, pregnant, trying to become pregnant or nursing?
2. Do you take warfarin or another blood thinner?
3. Do you take insulin or other diabetes medicine that lowers blood sugar?
4. Do you take thyroid hormone, seizure medicine, chemotherapy, antibiotics or bone-strengthening medicine?
5. Do you have liver or gallbladder disease, or have you had liver trouble before?
6. Do you have kidney disease or a seizure disorder?
7. Do you have sudden numbness or weakness (especially on one side), trouble speaking or walking, chest pain or trouble breathing right now?
8. Is your tingling or numbness new, spreading, in both feet, or has no known cause?
Answer all 8Your result shows here. It is a checklist, not medical advice.

Flow Nerves capsule: 30 a bottle1 capsule a day per the seller's FAQ · 2, 3 or 6 bottles · 2 bottles at $79 each · other prices at checkout

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The capsule

Does Flow Nerves contain B12?

No. B12 is not one of the six named ingredients, so the capsule cannot stand in for a B12 test. See B12 and nerve health.

Call 911

Sudden numbness or weakness, especially on one side, trouble speaking, chest pain or trouble breathing.

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6 Flow Nerves capsule bottles

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Dollar amounts for these two packs are shown at the live checkout; the seller's brief printed none (Flow Nerves sales site). Two bottles are also sold at $79 each. If you take blood thinners, diabetes medicine or thyroid hormone, ask a clinician or pharmacist before you order.

FAQ

Flow Nerves questions people ask

What are the symptoms of B12 deficiency?

NIH names numbness and tingling in the hands and feet, even without anemia. We cite no longer list. See a clinician for any lasting symptom.

How is B12 deficiency diagnosed?

Ask your clinician for a B12 test. We read no source on test details, so we describe none. A test beats guessing.

Can metformin cause low B12?

NIH says metformin can lower B12 absorption. Ask your clinician or pharmacist about a test, and keep taking prescribed medicine as directed.

Who wrote this

Written and reviewed by

Written byThe Flow Nerves label deskGoflownerves, licensed U.S. retail desk for Flow Nerves

Pages built from the bottle render, the seller's brief and linked NIH, FDA, CDC, FTC and peer-reviewed sources.

Medically reviewed byDr. Edgar Martorell, MD, PhysicianRole: Medical reviewerReview date: November 3, 2026

Last updated . Read our editorial standards and how we check reviews. This website is the information site of a licensed U.S. retail desk for Flow Nerves. It is not the manufacturer, and we have not been given the name of the maker. We earn money when you buy through our order links.

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Check your medicines first, and ask a clinician or pharmacist if you take blood thinners, diabetes medicine or thyroid hormone. Then pick a pack: 2, 3 or 6 bottles of 30 capsules. The 2-bottle pack is listed at $79 a bottle; the other prices are shown at checkout. A 60-day satisfaction promise is listed, so confirm the live policy.

2 bottles$15860 capsules · $79 a bottle3 bottlesAt checkout90 capsules · price at checkoutLongest supply6 bottlesAt checkout180 capsules · price at checkout
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Flow Nerves capsule30 capsules a bottle · 2 bottles at $79 each · other prices at checkout

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