Shellfish allergen
Nervecept Shellfish Allergy: It Contains Crayfish, and What That Means for You
Yes, Nervecept contains shellfish. The label reads "CONTAINS: Shellfish (Crayfish)" because its glucosamine is made from crustacean shells. If you have a shellfish allergy, do not take it. Bromelain in the formula comes from pineapple, a second, smaller allergy note. Call 911 for trouble breathing, throat swelling or fainting after a capsule.
Written by the Nervecept label deskUpdated
The allergen line01
Does Nervecept contain shellfish?
Yes. Nervecept contains shellfish, and the label says so in plain words under the Supplement Facts: "CONTAINS: Shellfish (Crayfish)." Anyone with a shellfish allergy should not take it.
The source is the biggest ingredient. Glucosamine sulfate, 500 mg per capsule, is made from the shells of crayfish, a freshwater crustacean related to shrimp, crab and lobster. That one line is 500 of the 699 mg of actives, about 72% of the capsule's ingredient weight, so the shellfish source is not a trace add-in.
Shellfish allergy is usually lifelong, and reactions can be severe. Safety pages on glucosamine advise people with a shellfish allergy to talk with a provider first, because the supplement may cause a reaction (MSKCC, Glucosamine).
Where to find it on the bottle
Turn the bottle to the right panel. The allergen line sits just below the eight ingredient rows and the "Other ingredients" line. It is short and easy to miss on a quick look.
The other ingredients are Hypromellose (Vegetable Capsule), Rice Flour. Neither is a major allergen.
FDA major allergens02
Is crayfish one of the FDA major food allergens?
Yes. Crayfish is a crustacean shellfish, one of the nine major food allergens FDA recognizes. Federal law requires labels to name the source of a major allergen, which is why the Nervecept label says "Crayfish" and not just "Shellfish" (FDA, Food Allergies).
The nine are milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans and sesame. Sesame joined the list on January 1, 2023 (FDA, Food Allergies).
| Major allergen | Declared on the Nervecept label? |
|---|---|
| Crustacean shellfish | Yes: crayfish |
| Milk | Not declared |
| Eggs | Not declared |
| Fish | Not declared |
| Tree nuts | Not declared |
| Peanuts | Not declared |
| Wheat | Not declared |
| Soybeans | Not declared |
| Sesame | Not declared |
"Not declared" means the label does not list it. The label makes no shared-facility statement, and no lab report is published, so a severe allergy to any food is worth a call to your allergist.
Glucosamine and allergy03
Can people with a shellfish allergy take glucosamine?
People with a shellfish allergy should not take Nervecept's glucosamine without an allergist's clear go-ahead. Shell-based glucosamine may cause an allergic reaction, and the label gives no reason to think this one is an exception (MSKCC, Glucosamine).
Some people argue that the allergy protein sits in shellfish meat, not shells, so purified glucosamine should be safe. The label does not say how pure this glucosamine is, and it still declares crayfish. We follow the label.
Glucosamine can also be made without shellfish, by fermenting corn. That kind would carry no crayfish line. It is not what Nervecept uses, and the label offers no swap. If an allergist ever clears shell-based glucosamine for you, ask for that advice in writing and start only under their plan. More detail is on the glucosamine sulfate page.
Other triggers04
Does Nervecept contain pineapple or other allergy triggers?
Nervecept contains bromelain, an enzyme mix from pineapple stem, so people allergic to pineapple should ask before taking it. Pineapple is not one of the nine major allergens, so the label does not flag it.
Bromelain has allergy reports of its own (MSKCC, Bromelain). At 8 mg per capsule the amount is small, but small amounts can still matter for people who react to pineapple.
Shellfish (crayfish)
The glucosamine source. Skip Nervecept with a shellfish allergy.
Pineapple (bromelain)
8 mg from pineapple stem. Ask first with a pineapple allergy.
The capsule shell is hypromellose, a plant cellulose, not gelatin. Rice flour is the filler.
Nervecept: from $49 a bottle30 capsules · 2, 3 or 6 bottles · free US shipping on 3 or 6 · 60-day guarantee
See packsIf a reaction starts05
What should you do if you have a reaction to Nervecept?
If you react to Nervecept, stop taking it right away. Call 911 for severe signs such as trouble breathing, throat or tongue swelling, or fainting. Call your doctor for milder signs such as itching or a rash.
Allergic reactions often start within minutes to two hours of swallowing a trigger. Mild signs can turn severe quickly, so do not wait to see if they pass. After a serious reaction, symptoms can return hours later, so follow up with your doctor even once you feel fine.
Trouble breathing or wheezing; swelling of the lips, tongue or throat; a tight throat or hoarse voice; hives spreading over the body with vomiting; dizziness, a weak pulse or fainting. If you carry an epinephrine auto-injector, use it as your doctor told you, then call 911.
Stop the capsules
Do not take another one, even a day later.
Get care
Call 911 for severe signs. Call your doctor for itching, a rash or stomach cramps.
Keep the bottle
Note lot code N-26/GO-6882 and the time you took the capsule.
Report it
FDA asks people to report bad reactions to supplements (FDA 101: Dietary Supplements). For a refund, call the order desk at +1 (302) 200-3480.
At home06
How do you keep Nervecept away from family members with allergies?
Keep Nervecept in its original bottle, closed and out of reach, so the allergen line always travels with the capsules. The label says to keep it out of reach of children.
A child with a shellfish allergy who finds a loose capsule cannot read a warning. A pill box without a label hides the warning from adults, too.
- Store it on a high shelf, away from children's food and medicine.
- Tell anyone who cooks or shops for the household that it contains crayfish.
- Do not crush or open capsules near food or prep surfaces.
- Check the allergen line on every new bottle in a pack.
If you are allergic07
What can you do instead if you are allergic to shellfish?
If you are allergic to shellfish, skip Nervecept and ask your doctor what to try instead. There is no shellfish-free version of Nervecept.
Start with the cause of your symptoms. Numbness or tingling may come from diabetes, low vitamin B12 or many other causes, and treatment depends on which one it is (NINDS, Peripheral Neuropathy). Keep taking prescribed medicine exactly as your doctor directs while you sort it out.
If you already ordered and cannot take it, the money-back window is 60 days from purchase, and unopened bottles count. See the guarantee page for the steps.
FAQ08
Nervecept allergen questions
Should I bring the Nervecept bottle to my allergist?
Yes. The allergist can read the allergen line, the eight ingredients and the lot code directly. That is faster and safer than describing the capsule from memory or from a web page.
Can I take Nervecept if I am only allergic to shrimp?
No, not without an allergist's approval. Shrimp and crayfish are both crustaceans, and people allergic to one are often allergic to others. The label declares crayfish.
Is Nervecept safe with a fish allergy?
Fish is not declared on the label; the declared allergen is crustacean shellfish. Fish and shellfish allergies are different, but ask your allergist first if your allergy is severe.
Does Nervecept contain gluten?
The label makes no gluten claim. The filler is rice flour, which is naturally gluten-free, and wheat is not declared. No gluten-free certification is printed.
Is the Nervecept capsule shell made from gelatin?
No. The label lists hypromellose (vegetable capsule), a plant-based cellulose shell, plus rice flour as the other ingredients.
Can a pineapple allergy react to Nervecept?
It might. Bromelain, 8 mg per capsule, comes from pineapple stem and has allergy reports. Ask your allergist before taking it.
Does Nervecept list a shared-facility allergen warning?
No. The label has one allergen line, for crayfish, and no statement about shared equipment. The manufacturer is not named, so we cannot add more.
Who wrote this09
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a Nervecept licensed U.S. outlet, not by the manufacturer or the distributor. We earn money when you buy through our order links.
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