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Glucosamine Shellfish Allergy: Nervecept Contains Crayfish
Glucosamine shellfish allergy is a real concern with Nervecept, because its glucosamine is made from crustacean shells. Nervecept's label says CONTAINS: Shellfish (Crayfish). If you are allergic to shellfish, do not take it, and ask your doctor about any glucosamine product.
Written by the Nervecept label deskUpdated · 4 min read
Does glucosamine cause a shellfish allergy reaction?
It can. MSKCC says people allergic to shellfish should consult a provider, because glucosamine supplements may cause an allergic reaction (MSKCC, Glucosamine).
The cause is the source. The glucosamine in Nervecept is made from crustacean shells, and the label names the allergen. Our sources do not say how likely a reaction is, so we do not guess.
That is why the safe rule is simple. With a shellfish allergy, skip the product unless your doctor says otherwise.
What does the Nervecept label say about shellfish?
The label says "CONTAINS: Shellfish (Crayfish)." Crayfish is a crustacean shellfish, one of the nine major allergens that FDA says labels must name (FDA, Food Allergies).
The warning sits under the Supplement Facts. Glucosamine sulfate is 500 mg of the 699 mg of actives, so the allergen source is the largest line in the capsule.
Who should not take a glucosamine supplement?
Do not take Nervecept if you are allergic to shellfish. Ask a doctor first if you take warfarin, have diabetes or have surgery coming up.
MSKCC adds that glucosamine with chondroitin may raise INR on warfarin, and may worsen insulin resistance (MSKCC, Glucosamine). The label also tells pregnant or nursing mothers, anyone under 18 and anyone with a medical condition to consult a physician.
| If you | Why |
|---|---|
| Are allergic to shellfish | The capsule contains crayfish |
| Take warfarin | INR may rise (MSKCC, Glucosamine) |
| Have diabetes | Blood sugar may be affected (MSKCC, Glucosamine) |
Five quick questions:
What should you do if you react to a supplement?
Stop the product, seek care, and report the reaction to FDA (FDA 101: Dietary Supplements).
- Keep the bottle and the lot number.
- Tell the clinician what you took and how much.
Never stop a prescribed medicine on your own. Ask your doctor what to do next.
What if you are not allergic?
Then the allergen is not your concern, but the other cautions still apply. No trial has tested Nervecept, and most of its ingredients are joint-style.
See the shellfish allergen page and the ingredient doses. Bottles are $79, $69 or $49 each depending on the pack, with a 60-day money-back guarantee on the sales page.
FAQ01
Nervecept questions people ask
Is there glucosamine without shellfish?
Our sources do not say. Check each label for an allergen line and ask the maker about the source. Nervecept states shellfish (crayfish) plainly.
Does a shellfish allergy include crayfish?
Yes, crayfish is a crustacean shellfish, a major allergen that labels must name (FDA, Food Allergies). Nervecept's label lists it.
Can I ask my doctor about a shellfish allergy test first?
Yes. A doctor can advise on testing and on any glucosamine product. Bring the Supplement Facts panel to the visit.
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 . 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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