Article
Metformin and B12: A Documented Link Worth Asking About
Metformin and B12 are linked: the NIH fact sheet says metformin might reduce B12 absorption and significantly lower B12 blood levels. Low B12 can cause numbness and tingling in the hands and feet. Ask your doctor about a B12 check, and never stop metformin on your own. Flow Nerves lists no B12.
Written by the Flow Nerves label deskUpdated · 4 min read
The link
Does metformin lower B12?
It can. The NIH fact sheet says metformin might reduce the absorption of vitamin B12 and significantly reduce serum B12 levels (NIH ODS, Vitamin B12).
It also names prolonged use of some medicines, such as metformin and acid reducers, among the causes of deficiency. This is a documented effect, not a reason to stop the medicine.
Keep taking prescribed medicine. Raise B12 with your doctor.
Nerves
Why does low B12 matter for tingling feet?
Because low B12 can itself cause numbness and tingling in the hands and feet (NIH ODS, Vitamin B12). Diabetes is also the leading cause of nerve problems (NINDS, Peripheral neuropathy).
So two causes can overlap in one person. That is why a doctor sorts them with tests, rather than a supplement label.
| Possible cause | Who checks | How |
|---|---|---|
| Diabetes nerve damage | Doctor | Exam and nerve tests (MedlinePlus, Diabetic neuropathy) |
| Low B12 | Doctor | Blood test |
| Other causes | Doctor | History and tests |
Visit prep
What should you ask your doctor?
Ask whether a B12 check fits you, how often, and what to do with the result. Bring the note below and your medicine list.
A note-taking aid, not a test. CDC suggests keeping notes on symptoms to share with your doctor (CDC, Diabetes and nerve damage), and Mayo Clinic says to seek medical care right away for tingling, weakness or pain in your hands or feet (Mayo Clinic, Peripheral neuropathy).
Interactions
Do Flow Nerves ingredients interact with diabetes medicine?
Some do. MSK says alpha lipoic acid may produce synergistic effects with diabetes drugs, so low blood sugar is the concern (MSK, Alpha-lipoic acid). MSK also says magnesium may raise the absorption of sulfonylurea drugs (MSK, Magnesium).
NIDDK lists the signs of low blood sugar: shaky, hungry, tired, dizzy, confused, a fast heartbeat (NIDDK, Low blood glucose). Ask a pharmacist before you add any supplement to metformin or other diabetes medicine.
The product
Where does Flow Nerves fit?
Flow Nerves lists no B12, and no study of it exists in our sources. Its label claims only NERVE SUPPORT*.
Adults 18 and older. Ask your doctor first if you take diabetes medicine. The live checkout is final on price.
FAQ
Flow Nerves questions people ask
Should I take B12 if I take metformin?
Ask your doctor first. NIH describes the effect on B12 levels (NIH ODS, Vitamin B12), but whether you need a check or a supplement depends on you. A blood test can tell.
Can I stop metformin if my B12 is low?
No. Keep taking prescribed medicine unless your doctor says otherwise. Low B12 is handled with your doctor, not by stopping the medicine.
Can metformin cause tingling feet?
Not directly, from what we read. Low B12, which metformin might cause, can (NIH ODS, Vitamin B12). Diabetes itself is a leading cause. A doctor can tell which.
Can I take Flow Nerves with metformin?
Ask your doctor or pharmacist first. Alpha lipoic acid and magnesium have documented links to diabetes medicine (MSK, Alpha-lipoic acid) (MSK, Magnesium).
Who wrote this
Written and reviewed by
Pages built from the label, the brand panels and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site for a U.S. stocking partner for Flow Nerves. It is not the manufacturer or a distributor named on the label. We earn money when you buy through our order links.
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Check your medicines first with the Switchboard, especially diabetes medicine, blood thinners and blood pressure medicine, and see a doctor about new numbness or tingling, then pick a pack. On the seller's count one bottle is 30 days; 3 bottles cover 90 days and 6 cover 180.
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