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Interaction guide

Joint Supplements and Blood Thinners: Glucosamine, Turmeric and Warfarin

Four of Nervecept's eight ingredients come up in blood-thinner interaction discussions. Here is what is known and what to ask your clinician.

Updated October 16, 2026Matched to the bottle label5 cited sources

Glucosamine and warfarin

A case report and a review of FDA MedWatch submissions described people on warfarin whose INR rose after starting glucosamine, in some cases with bruising or bleeding[1]. The mechanism is unclear, and doses were often higher than Nervecept's, but the pattern was consistent enough to prompt caution.

Turmeric, bromelain and quercetin

Curcumin affects platelets in laboratory studies, and NCCIH notes possible interactions with medicines[2]. Bromelain has been reported to affect bleeding at higher doses[3]. Quercetin can alter how some drugs are metabolized at high doses[4]. At 8 to 50 mg these effects are likely small, but small effects add up when several ingredients and a blood thinner meet.

What INR is and why small changes matter

INR (international normalized ratio) measures how long blood takes to clot compared with a standard. People on warfarin usually have a target range, often 2 to 3, set by their clinician. Below the range, clots become more likely; above it, bleeding risk rises. Warfarin is sensitive to diet, illness and many medicines and supplements, which is why any new product is a reason for a closer look. Newer anticoagulants such as apixaban and rivaroxaban are not monitored with INR, but supplement interactions can still matter.

Other supplements with similar cautions

The same caution applies to several popular products: high-dose fish oil, ginkgo, garlic supplements, high-dose vitamin E, ginger and some traditional herbal mixes. Taking several of them together with a blood thinner adds up. Bring the bottles, or photos of the labels, to your pharmacist; it takes a few minutes and is the most reliable way to check.

What to ask your clinician

  1. Is it reasonable for me to take this supplement with my anticoagulant?
  2. Should my INR be checked sooner after I start?
  3. Should I stop it before any procedure, and how far ahead?

Tell every clinician you see which supplements you take[5].

Sources for this page

Each entry links to the original record. These studies test single ingredients, usually at higher doses; none tested the finished Nervecept capsule.

  1. 1Knudsen JF, Sokol GH. Potential glucosamine-warfarin interaction resulting in increased international normalized ratio: case report and review of the literature and MedWatch database. Pharmacotherapy. 2008;28(4):540-548. pubmed.ncbi.nlm.nih.gov/18363538/
  2. 2National Center for Complementary and Integrative Health. Turmeric: Usefulness and Safety. www.nccih.nih.gov/health/turmeric
  3. 3Brien S, Lewith G, Walker A, Hicks SM, Middleton D. Bromelain as a treatment for osteoarthritis: a review of clinical studies. Evid Based Complement Alternat Med. 2004;1(3):251-257. pubmed.ncbi.nlm.nih.gov/15841258/
  4. 4Li Y, Yao J, Han C, et al. Quercetin, inflammation and immunity. Nutrients. 2016;8(3):167. pubmed.ncbi.nlm.nih.gov/26999194/
  5. 5National Center for Complementary and Integrative Health. Using Dietary Supplements Wisely. www.nccih.nih.gov/health/using-dietary-supplements-wisely

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