Flow Nerves Official Website: Six Ingredients, No Milligrams

No study of Flow Nerves has been published in the sources we read, so no one can say what it does. Some of the six single ingredients have been studied, mostly at set doses and in people with diabetes. The label prints no dose, so those studies cannot be matched to a capsule.

NCCIH says that for most dietary supplements there is no evidence of a benefit on diabetes or its complications (NCCIH, Diabetes and supplements). Each seller claim is set below word for word, next to what the sources say.

1. Front of the label“NERVE SUPPORT*”The asterisk points to a statement that was not on the supplied image. In the U.S. such a statement is the FDA disclaimer: not evaluated, and not intended to diagnose, treat, cure or prevent any disease. FDA does not approve supplements before they are sold. The label prints no amount for any ingredient. (FDA, Dietary supplement Q&A)
2. Seller's page“formulated to support the nerve endings in your hands, feet, and legs”No study of Flow Nerves exists in the sources we read. Numbness and tingling in the hands and feet have many causes, from diabetes to low B12, and Mayo Clinic says to seek medical care right away for tingling, weakness or pain in the hands or feet. (Mayo Clinic, Peripheral neuropathy) (NINDS, Peripheral neuropathy)
3. Seller's page“help relieve occasional nerve discomfort”A claim like that needs human trials of the product itself, says FTC staff guidance. We found none for Flow Nerves. Nerve discomfort that keeps coming back deserves a checkup, not a guess. (FTC, Health products guidance) (CDC, Diabetes and nerve damage)
4. Seller's page“less of that heavy, tingling, 'on edge' sensation by the end of the day”Tingling is a symptom with causes a clinician can check, such as diabetes, a vitamin shortfall or a pinched nerve. No source we read says that a capsule of these six names changes it within weeks. (Mayo Clinic, Peripheral neuropathy) (NIH ODS, Vitamin B12)
5. Seller's page“clinically studied nutrients” and “Science-Backed”Single ingredients have been studied, at set doses and often by vein, in people with diabetes. The label prints no dose, so the studies cannot be matched to a capsule. NIH says that for most supplements there is no evidence of a benefit on diabetes or its complications. (NCCIH, Diabetes and supplements) (Mijnhout 2012, ALA meta-analysis)
6. Seller's page“A highly absorbable magnesium form”The NIH magnesium fact sheet does not name glycinate. It says some forms (aspartate, citrate, lactate, chloride) tend to be better absorbed than oxide and sulfate. The label prints no amount of elemental magnesium. (NIH ODS, Magnesium)
7. Seller's page“helps protect nerve cells from oxidative stress”NIH calls the alpha lipoic acid studies limited, with no clear conclusions. MSK says earlier studies of reversing neuropathies gave mixed results. These were people with diabetes, and the label prints no ALA amount. (NCCIH, Diabetes and supplements) (MSK, Alpha-lipoic acid)
8. Seller's page“supports antioxidant defense and inflammatory balance” (turmeric)NCCIH says we do not know enough to conclude turmeric or curcumin helps for any health purpose, and that highly bioavailable curcumin formulas may harm the liver. (NCCIH, Turmeric)
9. Seller's page“Traditionally used to promote healthy circulation” (butcher's broom)Drugs.com says trials of butcher's broom alone are generally lacking, and WebMD calls its benefits not well defined. Neither names nerves. (Drugs.com, Butcher's broom) (WebMD, Butcher's broom)
10. Seller's page“natural, well-tolerated ingredients” and “most people take it alongside their daily routine without any issue”Natural does not mean free of interactions. Alpha lipoic acid, magnesium, turmeric, coenzyme Q10, L-carnitine and butcher's broom each have a documented interaction with at least one common medicine. Use the Switchboard. (MSK, Alpha-lipoic acid) (MSK, Turmeric) (Mayo Clinic, Coenzyme Q10)

Claims as printed on the brand panels. Health claims in ads need competent and reliable scientific evidence, generally human trials of the same product (FTC, Health products guidance).

Read the full claims vs evidence page.

Mayo Clinic says to seek medical care right away if you notice tingling, weakness or pain in your hands or feet, because early diagnosis gives the best chance of managing the cause (Mayo Clinic, Peripheral neuropathy). A capsule is not a checkup.

Many things can sit behind these symptoms. Diabetes is the leading cause of peripheral neuropathy in the U.S. (NINDS, Peripheral neuropathy). Low B12, alcohol use, injury, some medicines and other health problems are on the list too.

• DiabetesThe leading cause of peripheral neuropathy in the U.S.; about two thirds of people with diabetes have nerve problems of some degree. (NINDS, Peripheral neuropathy) (ADA, Neuropathy and diabetes)
• A vitamin shortfallB vitamins, copper and vitamin E matter to nerves. With low B12, numbness and tingling in the hands and feet can occur. (Mayo Clinic, Peripheral neuropathy) (NIH ODS, Vitamin B12)
• AlcoholAlcohol use disorder can damage nerves directly and by lowering vitamins. (Cleveland Clinic, Peripheral neuropathy) (Mayo Clinic, Peripheral neuropathy)
• Injury or pressureA crush, a fracture, a slipped disk or repeated pressure on a nerve can all cause symptoms. (NINDS, Peripheral neuropathy) (Mayo Clinic, Peripheral neuropathy)
• MedicinesSome medicines, especially chemotherapy, can cause peripheral neuropathy. (Mayo Clinic, Peripheral neuropathy)
• Other health problemsInfections such as shingles, autoimmune conditions, kidney, liver or thyroid disease, and inherited conditions are on the list. Sometimes no cause is found. (Mayo Clinic, Peripheral neuropathy) (MedlinePlus, Peripheral nerve disorders)

1. Sudden weakness or numbness on one side, trouble speaking, chest pain, trouble breathingThese can signal an emergency. Do not wait.Call 911
2. Swelling of the lips, face or throat, hives, or trouble breathing after a supplementAllergic reactions to butcher's broom can be serious, WebMD says. Stop and call 911.Call 911
3. Confusion, shaking, sweating or a very fast heartbeat if you take diabetes medicineThese can be signs of low blood sugar, and very low blood sugar needs treatment right away, NIDDK says.Call 911
4. New tingling, weakness or pain in your hands or feetMayo Clinic says to seek medical care right away. Early diagnosis gives the best chance of managing symptoms.See a doctor
5. A foot sore that is infected or will not healCDC lists it among the reasons to call your doctor if you have diabetes.See a doctor
6. Falls, lost coordination or muscle weaknessMayo Clinic lists them as symptoms to have checked.See a doctor
7. Burning, tingling or pain that disrupts your day or your sleepCDC says to call your doctor, and to keep notes on the symptoms to share.See a doctor
8. Changes in digestion, urination or sexual function, dizziness or faintingCDC lists these with nerve damage in people with diabetes.See a doctor

Signs from (Mayo Clinic, Peripheral neuropathy) and (CDC, Diabetes and nerve damage). This list is not complete, and a supplement is never a reason to wait.

Make a note for your visit

Tick what applies, and copy the note. It lists your symptoms and what to bring, including a photo of this bottle's label.

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).

More in our guide on when to see a doctor.

Adults 18 and older only. Ask a doctor or pharmacist first if you are pregnant or nursing, take any medicine, or have a medical condition. Take the quick check below.

More detail is on the side effects page. If you think you have a bad reaction, FDA runs a reporting program for supplements (FDA, MedWatch).