Side effects and warning signs
Nerve supplement side effects: what to watch and when to get care
Nerve supplement side effects are most often stomach upset, such as nausea, cramps or diarrhea. Some ingredients also carry medicine interactions, including blood thinners and diabetes medicine, and turmeric has liver injury reports. Ask a pharmacist before adding any supplement, and get care for dark urine, yellow skin or unusual bruising.
Written by the Flow Nerves label deskUpdated · 5 min read
Common effects
What are the common nerve supplement side effects?
Nerve supplement side effects are mostly digestive: nausea, cramps and diarrhea. Each ingredient also has its own cautions, and a "support" label does not remove them.
| Ingredient | What the sources report |
|---|---|
| Magnesium | Diarrhea, nausea and cramping at high supplement doses; NIH's upper intake from supplements and medicines is 350 mg a day (NIH ODS, Magnesium) |
| Alpha lipoic acid | Nausea, vomiting and low blood sugar (MSK, Alpha-lipoic acid) |
| L-carnitine | At about 3 g a day, nausea, vomiting, cramps, diarrhea and fishy body odor; seizures in people with seizure disorders (NIH ODS, Carnitine) |
| Turmeric | Stomach effects; liver damage reported (NCCIH, Turmeric) |
| Coenzyme Q10 | Nausea, diarrhea, loss of appetite and sleeplessness (MSK, Coenzyme Q10) |
Medicine interactions
Which medicines raise nerve supplement risks?
Blood thinners, diabetes medicine, thyroid hormone, antibiotics and bone medicines are the main groups. A pharmacist can check your list.
- Blood thinners: MSK says people on warfarin or other blood thinners should not take turmeric supplements, and reports coenzyme Q10 may raise bleeding risk with warfarin (MSK, Turmeric) (MSK, Coenzyme Q10)
- Insulin and diabetes medicine: alpha lipoic acid lists low blood sugar as an adverse effect (MSK, Alpha-lipoic acid)
- Thyroid hormone: in a 2001 trial, 2 or 4 g a day of L-carnitine worked against it in 50 women (Benvenga 2001, L-carnitine and thyroid hormone)
- Antibiotics and bone medicines: magnesium can reduce their absorption (NIH ODS, Magnesium)
Never stop or change a prescribed medicine because of a supplement. For butcher's broom and blood pressure or prostate medicines, we found no source; ask a pharmacist.
Stacking
Why does stacking raise nerve supplement risks?
Two products can carry the same ingredient, and the totals add up. NIH's 350 mg magnesium figure counts every supplement and medicine together, and NIH says more might not be better (NIH ODS, Dietary Supplements: What You Need to Know). Name every product to your pharmacist and keep a record with start dates.
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
See the priceWarning signs
When should you stop a nerve supplement or call 911?
Stop and get care for the signs below. Keep taking prescribed medicine; sudden numbness or weakness (especially on one side), trouble speaking, chest pain or trouble breathing: call 911.
- Sudden numbness or weakness on one side, trouble speaking, seeing or walkingCall 911. CDC lists these as stroke signs.
- Dark urine, yellow skin or eyes, belly pain, fatigueCan be signs of liver trouble, which LiverTox links to turmeric. Stop and get medical care the same day.
- Unusual bruising, nosebleeds or blood in urine or stoolPossible bleeding, especially on a blood thinner (MSK on turmeric and CoQ10). Stop and call your clinician or pharmacist.
- Shaky, sweaty, confused, very hungryPossible low blood sugar if you take diabetes medicine (MSK on alpha lipoic acid): treat it as your care team told you and call them.
- Rash, hives or swellingPossible allergy. Stop and get medical help; swelling of the face or throat or trouble breathing is an emergency.
- Diarrhea, nausea, stomach crampsCommon supplement effects (NIH on magnesium and carnitine). Stop and ask a clinician if they persist.
Signs from (CDC, Stroke signs and symptoms) (LiverTox, Turmeric) (MSK, Alpha-lipoic acid) (NIH ODS, Magnesium). This list is not complete. A supplement is never a reason to wait.
LiverTox links turmeric to liver injury, usually 1 to 4 months after starting (LiverTox, Turmeric). You can report a reaction to the FDA (FDA report a problem).
Flow Nerves
Do these risks apply to Flow Nerves?
They can, because Flow Nerves names all five of these ingredients, plus butcher's broom. We hold no Supplement Facts panel and no amount is printed, so nobody can say how close any ingredient is to a studied dose. Ask a pharmacist first, and see the medicine guide.
90-capsule supply
3 bottles: 90 capsules
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180-capsule supply
6 bottles: 180 capsules
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See 6 bottlesDollar 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
Can nerve supplements cause stomach upset?
Yes. NIH lists diarrhea, nausea and cramping for high supplemental magnesium doses and for about 3 g a day of carnitine. If upset persists, ask a clinician or pharmacist.
Is it risky to take two nerve supplements together?
It can be, because the same ingredient may appear in both and the amounts add up. Read both labels and tell a pharmacist about each product before combining them.
What should I do if a supplement causes a reaction?
Stop it, get medical care for anything serious, and tell your clinician. You can report the reaction to FDA. Call 911 for swelling of the face or throat, trouble breathing, or sudden weakness on one side.
Who wrote this
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Pages built from the bottle render, the seller's brief 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 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.
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