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What Are the Side Effects of Nerve Supplements, Ingredient by Ingredient?
Side effects of nerve supplements vary by ingredient. Glucosamine can cause nausea, heartburn and diarrhea, and may matter with shellfish allergy or warfarin. Turmeric has rare liver injury reports, with onset typically 1 to 4 months after starting (LiverTox, Turmeric). The Nervecept label also lists shellfish (crayfish).
Written by the Nervecept label deskUpdated · 4 min read
What are the common side effects of nerve supplements?
The common ones are mild stomach upsets. Rarer ones involve allergies, bleeding with certain drugs, blood sugar and the liver.
The table covers the label lines with a source. For MSM and bromelain we found no authoritative safety source, and methionine has none on supplement safety either.
| Ingredient (mg per capsule) | Notes from sources |
|---|---|
| Glucosamine sulfate (500) | Nausea, heartburn, diarrhea, constipation; shellfish allergy concern; may raise blood glucose; warfarin effect (NCCIH, Glucosamine and Chondroitin) (Mayo Clinic, Glucosamine) |
| Chondroitin sulfate (50) | May raise warfarin bleeding risk (NCCIH, Glucosamine and Chondroitin) |
| Indian frankincense (67) | Generally well tolerated; may raise bleeding risk with blood thinners (MSK, Boswellia) |
| Turmeric (50) | Rare liver injury; bleeding note with blood thinners (NCCIH, Turmeric) (MSK, Turmeric) |
| Quercetin (8) | Raised INR reported in one patient on warfarin (MSK, Quercetin) |
Which side effects need quick medical attention?
Stop the product and call a provider if you notice allergy signs or liver warning signs.
NCCIH lists fatigue, nausea, poor appetite, dark urine and jaundice as signs of possible liver trouble with turmeric products (NCCIH, Turmeric). Allergy signs include hives, swelling or trouble breathing; treat those as an emergency.
Report a bad reaction to the FDA through MedWatch (FDA, MedWatch).
Keep taking prescribed medicine, and tell your doctor and pharmacist about every supplement. New numbness, weakness or balance trouble needs a doctor.
Which cautions are printed on the Nervecept label?
The label carries four cautions: shellfish, the dose limit, groups who should ask a physician first and the safety seal.
It reads "Contains: Shellfish (Crayfish)" and "Do not exceed recommended dose." Pregnant or nursing mothers, anyone under 18 and anyone with a known medical condition should consult a physician. Tap the numbered spots to read each panel line.
Tap a number to read that part of the label.
- Serving
Serving size 1 capsule; 30 servings per container.
- Glucosamine sulfate
500 mg: 71.5% of the 699 mg listed. Usually made from shellfish shells.
- Indian frankincense
67 mg of Boswellia serrata (herb): 9.6%.
- Chondroitin and turmeric
50 mg each (7.2% each). Turmeric is the root of Curcuma longa.
- Four 8 mg lines
Quercetin (Sophora japonica bud), methionine, MSM and bromelain (Ananas comosus stem): 1.1% each.
- Daily Value
The ** note: Daily Value is not established for any of the lines.
The label does not print the warfarin or diabetes notes above, so ask a pharmacist. See the side effects page for more.
Nervecept: from $49 a bottle30 capsules · 2, 3 or 6 bottles · free US shipping on 3 and 6 · 60-day money-back guarantee
See packsHow is Nervecept sold if the cautions suit you?
The brand sells it in packs on its sales page, and the buttons here lead there. A bottle is 30 capsules.
The 3-bottle pack is $207 (about $2.30 a day). The 6-bottle pack is $294 (about $1.63 a day). Both ship free in the US with a 60-day money-back guarantee; confirm at checkout (Nervecept sales page). Compare the ingredient amounts first.
90-day supply
3 bottles: 90 days
$207$69 a bottle · about $2.30 a day
Free US shipping · 60-day money back
Order 3 bottles
Lowest per bottle
6 bottles: 180 days
$294$49 a bottle · about $1.63 a day
Free US shipping · 60-day money back
Order 6 bottlesPrices on the Nervecept sales page, October 19, 2026 (Nervecept sales page). Two bottles are also sold for $158. Check your medicines and the shellfish line with your doctor before you order.
FAQ01
Nervecept questions people ask
What are the most common side effects of glucosamine?
Nausea, heartburn, diarrhea and constipation are the common ones. Glucosamine may also raise blood sugar in some people and may add to warfarin's effect. People with glaucoma or a shellfish allergy should ask a doctor first.
Can turmeric supplements harm the liver?
Rarely, yes. LiverTox rates turmeric as a well-documented cause of liver injury, usually 1 to 4 months after starting, mostly with high-absorption products. Stop and call a provider for dark urine, jaundice or lasting fatigue.
Do nerve supplements interact with blood thinners?
Several can. Glucosamine, chondroitin, turmeric, frankincense and quercetin each carry a bleeding or INR note. If you take warfarin or another blood thinner, ask your pharmacist before starting any of them.
Who wrote this02
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . See our editorial standards and how we check reviews. This website is run by a licensed U.S. retail desk for Nervecept, not by the manufacturer or the distributor. We are paid a commission when you buy through our order links.
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Check your medicines and the shellfish line first, then pick a pack. Six bottles cost the least per bottle; three and six ship free in the US; every pack carries the 60-day money-back guarantee.
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