Official product information
Nervecept Side Effects and Interactions: What to Know Before You Start
Nervecept side effects have not been measured in a trial of the capsules, so we report what sources say about each ingredient. The main cautions are the shellfish (crayfish) allergen, more bleeding risk with blood thinners such as warfarin, possible rises in blood glucose and stomach upset. Ask a clinician first if any of these apply.
Written by the Nervecept label deskUpdated
The overview01
What are the side effects of Nervecept?
The side effects of Nervecept are not known from a trial, because we found none of the finished capsules. What we have is what public sources say about each ingredient.
The main points are the shellfish allergen on the label, more bleeding risk with warfarin, a possible rise in blood glucose and stomach upset.
Large studies of glucosamine and chondroitin found no major safety problems, but the doses and the products differ from this capsule. (NCCIH, Glucosamine and Chondroitin)
| Ingredient (per capsule) | Caution named |
|---|---|
| Glucosamine sulfate, 500 mg | Shellfish allergen on this label. May raise blood glucose. Bleeding risk with warfarin (NCCIH, Glucosamine and Chondroitin) |
| Chondroitin sulfate, 50 mg | Bleeding risk with warfarin (NCCIH, Glucosamine and Chondroitin) |
| Turmeric root, 50 mg | Stomach upset. Liver injury with highly bioavailable curcumin (NCCIH, Turmeric) |
| Bromelain, 8 mg | Stomach upset and diarrhea. No named drug interactions on the source (NCCIH, Bromelain) |
| Frankincense, 67 mg | Little known in pregnancy or breastfeeding (NCCIH, Boswellia) |
| Quercetin, 8 mg | One 9-person safety trial; authors want 6 months of data (Han et al., BMJ Open Resp Res 2020) |
| MSM, 8 mg and methionine, 8 mg | No adverse events in one small MSM trial. No upper limit set in the methionine paper (Debbi et al., BMC CAM 2011) (Paoletti et al., Nutrients 2023) |
For bromelain, the source names no interactions and no doses. That means unknown, not safe.
Medicines02
Does Nervecept interact with blood thinners or diabetes medicines?
It may. Glucosamine and chondroitin have been associated with more bleeding risk in people taking warfarin, and glucosamine may raise blood glucose in some people. (NCCIH, Glucosamine and Chondroitin)
Nervecept contains all three. Ask your prescriber or pharmacist before you start, and tell them about every supplement. (NCCIH, Using Supplements Wisely)
Keep taking prescribed medicine exactly as directed. A supplement never replaces it, and the label tells anyone with a known medical condition to consult a physician.
Blood thinners
Glucosamine and chondroitin have been linked to more bleeding risk, including with warfarin. Tell the prescriber. (NCCIH, Glucosamine and Chondroitin) (NCCIH, Using Supplements Wisely)
Diabetes medicines
Glucosamine may raise blood glucose in some people, so anyone who tracks blood sugar should tell their care team. (NCCIH, Glucosamine and Chondroitin) (NCCIH, Diabetes and Supplements)
Shellfish allergy
The label says CONTAINS: Shellfish (Crayfish). Shellfish is a major allergen under FDA labeling rules. (FDA, Food Allergies)
Surgery
List every supplement for your surgeon and anesthesia team ahead of time. (NCCIH, Using Supplements Wisely)
Turmeric and the liver
Liver injury has been reported with highly bioavailable curcumin products, and turmeric can upset the stomach. Root powder differs from those extracts. (NCCIH, Turmeric)
Bromelain and frankincense
The sources we checked list no doses or named drug interactions for bromelain, and little is known about frankincense in pregnancy. Ask your pharmacist. (NCCIH, Bromelain) (NCCIH, Boswellia)
Our guide to supplements and blood thinners goes deeper.
Allergen03
Does Nervecept contain shellfish?
Yes. The Nervecept label says CONTAINS: Shellfish (Crayfish). Glucosamine is often made from shellfish shells.
FDA lists crustacean shellfish among nine major food allergens and requires labels to name the source. (FDA, Food Allergies)
With a shellfish allergy, do not use it unless an allergist says so.
The capsule shell is hypromellose, a vegetable material, so the shell is not the concern.
Digestion04
Can Nervecept upset the stomach?
It can in some people. NCCIH lists nausea, acid reflux, stomach upset, diarrhea and constipation among turmeric side effects. (NCCIH, Turmeric)
For bromelain, stomach upset and diarrhea are the most common ones named. (NCCIH, Bromelain)
We found no rate for the finished capsules.
The label says to take it with 8 oz of water 20 to 30 minutes before a meal. If that gives you stomach trouble, ask your pharmacist or doctor about timing. The limit stays at one capsule a day.
Liver and kidneys05
Is Nervecept safe for the liver and kidneys?
Nobody can say it is safe for either. We found no study of Nervecept and liver or kidney disease.
NCCIH reports liver damage with highly bioavailable curcumin products. The label lists turmeric root, 50 mg, with no stated curcuminoid content. (NCCIH, Turmeric)
The one quercetin safety trial saw liver and kidney function stay in range, but it had 9 people. (Han et al., BMJ Open Resp Res 2020)
NCCIH lists fatigue, nausea, poor appetite, dark urine and jaundice as signs. Stop the capsules and see a doctor if you notice them.
Nervecept: from $49 a bottlePacks of 2, 3 or 6 bottles · 30 capsules each · refund window 60 days
See packsSpecial groups06
What about surgery, pregnancy and children?
Tell your surgeon about Nervecept well before an operation, because some supplements can raise bleeding risk or change your response to anesthesia. (NCCIH, Using Supplements Wisely)
The label asks pregnant or nursing mothers and anyone under 18 to consult a physician before use. NCCIH says little is known about frankincense and bromelain in pregnancy and breastfeeding. (NCCIH, Boswellia) (NCCIH, Bromelain)
Surgery
The label gives no stop date. Ask the surgeon how far ahead, if at all.
Pregnant or nursing
Consult a physician first, as the label says.
Under 18
Consult a physician first. Keep the bottle out of children's reach.
Who Nervecept is for turns these cautions into a short fit check.
A doctor, not a supplement07
When does numbness or tingling need a doctor, not a supplement?
New, spreading or worsening numbness or tingling needs a doctor, not a capsule. Mayo Clinic says to seek care right away for tingling, weakness or pain in the hands or feet. (Mayo Clinic, Peripheral Neuropathy)
Neuropathy has more than 100 types, and diabetes is the leading cause in the U.S. (NINDS, Peripheral Neuropathy)
Do not rely on supplements instead of care. Nerve damage cannot be reversed once it occurs, so early diagnosis matters. (NIDDK, Treating Diabetic Neuropathy)
- New, spreading or worsening numbness or tinglingA reason to book a visit, not to try another capsule. (Mayo Clinic, Peripheral Neuropathy)
- A sore or blister on a numb footIf you have diabetes, check your feet daily and report sores early. (CDC, Your Feet and Diabetes)
- Weakness, clumsiness or fallsNerve problems can reach muscles. A doctor looks for the cause. (NINDS, Peripheral Neuropathy)
- Pain that wakes you or keeps climbingPersistent or severe pain deserves an exam. (Mayo Clinic, Peripheral Neuropathy)
- Numbness while taking metforminLow vitamin B12 can cause numbness and tingling, and metformin can lower B12. (NIH ODS, Vitamin B12)
- Symptoms after an injury or on one side onlyA pinched or compressed nerve is a different problem from a general one. (MedlinePlus, Carpal Tunnel Syndrome)
Call 911For sudden weakness or numbness on one side, trouble speaking, or loss of bladder or bowel control. Get checked rather than waiting for a supplement to work.
If something goes wrong08
What should you do if you react to Nervecept?
Stop taking it and get medical help for anything serious. FDA asks you to report a serious reaction through the Safety Reporting Portal. (FDA, Report a Supplement Problem)
Call 911 for swelling of the face or throat or trouble breathing. Keep the bottle for your clinician.
For a placed order or a refund, call +1 (302) 200-3480.
Joint-pain supplements are among the categories where FDA has found hidden drug ingredients, and labels do not always match contents. That is another reason to tell your pharmacist what you take. (FDA, Tainted Supplements) (NCCIH, Using Supplements Wisely) See the medical disclaimer too.
FAQ09
What do people ask about side effects?
A common question first: What are the side effects of Nervecept? It and 5 more are answered below.
Every answer gives the short reply first and the reasoning after, with a source when we have one.
What are the side effects of Nervecept?
No trial of the capsules reports side effects, so none are measured. For single ingredients, sources name stomach upset, possible blood glucose rises, more bleeding risk with warfarin and rare liver injury with highly bioavailable curcumin. The label also lists a shellfish allergen. (NCCIH, Glucosamine and Chondroitin) (NCCIH, Turmeric) (NCCIH, Bromelain)
Does Nervecept interact with warfarin?
Possibly, so ask your prescriber first. NCCIH says glucosamine and chondroitin have been associated with increased bleeding risk in people taking warfarin. Nervecept contains both, and we found no study of the finished capsules with warfarin. (NCCIH, Glucosamine and Chondroitin) (NCCIH, Using Supplements Wisely)
Can Nervecept raise or lower blood sugar?
It may raise it in some people. NCCIH says glucosamine may raise blood glucose in some people, and Nervecept holds 500 mg of glucosamine sulfate per capsule. We found no source that says it lowers blood sugar. If you track your glucose, tell your care team. (NCCIH, Glucosamine and Chondroitin)
Can Nervecept upset the stomach?
It can, in some people. NCCIH names stomach upset among the side effects of turmeric, and stomach upset and diarrhea as the most common ones for bromelain. Both are on the Nervecept label, at 50 mg and 8 mg. We found no figure for how often it happens with the capsules. (NCCIH, Turmeric) (NCCIH, Bromelain)
Is Nervecept safe for kidneys or liver?
We cannot say it is safe for either. NCCIH reports liver injury with highly bioavailable curcumin, which is not what the label lists, since it names turmeric root. We found no source on Nervecept and kidney disease, so anyone with kidney or liver disease should ask a doctor first. (NCCIH, Turmeric)
What should I do if I react to Nervecept?
Stop taking it and get medical help for anything serious, such as swelling, trouble breathing or hives. FDA asks you to stop use and report a serious reaction through its Safety Reporting Portal. Call 911 for severe symptoms, and tell your doctor which supplements you take. (FDA, Report a Supplement Problem)
Who wrote this10
Who is behind this Nervecept write-up?
The Nervecept label desk drafted it from the bottle, the sales page and the public sources linked in the text.
Once a clinician has reviewed it, the reviewer's name appears in the box below.
Drafted from the bottle, the sales page and the NIH, FDA, CDC, FTC and journal sources named in the text.
Most recent update: . How we work is set out in the editorial standards and the review rules. This website belongs to a USA authorized Nervecept retailer. It is neither the maker of the capsules nor the distributor named on the label. Purchases made through our order links earn us a commission.
Keep reading
Where should you go next with Nervecept?
Three good next stops are who it's for, supplements and blood thinners, faq.
They build on what you just read and cite their own sources.
USA Authorized Nervecept Retailer
Ready to try Nervecept?
Read the label, the shellfish line and your own medicine list first. Then choose a pack: the bigger ones cost less per bottle and ship free inside the US, and the 60-day refund clock starts on the purchase date.
- You check out on the sales page
- Refund window: 60 days
- US shipping is included on 3 or 6 bottles
