Devil's Claw

botanicalprocyanidin B1

What is it

Devil's claw (Harpagophytum procumbens) is a flowering plant native to southern Africa whose tuberous roots have been used traditionally for digestive complaints and as a tonic. In modern Western herbalism, it is primarily used for arthritis and back pain. The name comes from the small hook-like projections on the plant's fruit.

How it works

Devil's claw root contains iridoid glycosides, the most important being harpagoside, along with harpagide and procumbide. These compounds, particularly harpagoside, are thought to be primary contributors to anti-inflammatory and analgesic effects in joint pain conditions. Laboratory studies suggest harpagoside may modulate inflammatory pathways, including effects on cyclooxygenase (COX) enzymes, leukotriene synthesis, and inflammatory cytokine production. The compound has shown reduced prostaglandin E2 and other inflammatory mediators in some experimental models. The exact mechanisms in humans remain incompletely characterized. Clinical evidence is most developed for osteoarthritis and lower back pain, where standardized devil's claw extracts have shown modest benefits in multiple controlled trials. Effects are typically smaller than NSAIDs but with generally better tolerability for some users. Most clinical trials have run 4 to 12 weeks.

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Osteoarthritis

Grade B

Good evidence

Multiple controlled trials of standardized devil's claw extract show modest improvement in osteoarthritis pain and joint function, particularly in hip and knee osteoarthritis. Effects are smaller than NSAIDs but better tolerated for some users.

Low back pain

Grade B

Good evidence

Trials of devil's claw extract show modest benefit for chronic low back pain. Effects are comparable to some NSAIDs in some studies.

General rheumatic and joint pain

Grade C

Moderate evidence

Traditional use and clinical evidence support some benefit for general rheumatic complaints and inflammatory joint conditions.

Digestive complaints

Grade D

Mixed evidence

Traditional use for indigestion and loss of appetite has limited modern clinical support. The compound's bitter properties may stimulate digestion.

4 commercial forms

Standardized extract (harpagoside)

Standardized to harpagoside content (often 2-5%)

Most-studied form for arthritis. Look for products specifying harpagoside content for reliable dosing.

Dried root powder

Whole-root form, variable harpagoside content

Traditional whole-herb form.

Liquid extract / tincture

Alcohol or water-based extraction

Traditional form used in herbalist preparations.

Tea (decoction)

Aqueous extraction of dried root

Traditional preparation method.

Dosage

There is no established RDA. Traditional dried root preparations use 1.5 to 9 grams per day. Standardized extracts are commonly dosed to provide 50 to 100 mg of harpagoside per day, typically requiring 1,500 to 2,500 mg of extract daily. Most clinical trials for arthritis or back pain have used 600 to 2,400 mg of standardized extract per day for 4 to 12 weeks.

When and how to take it

Take devil's claw with meals to reduce gastrointestinal effects. Doses are typically divided two or three times daily. For arthritis or back pain, effects typically emerge over 2 to 6 weeks of consistent daily use. Continue for at least 4 weeks before judging effectiveness. May be used long-term under medical supervision for chronic joint conditions.

Safety

Devil's claw is generally well tolerated at typical doses. The most common side effects are mild gastrointestinal upset, especially diarrhea. Less commonly, headache, dizziness, and skin reactions occur. Some reports describe heart rate or blood pressure changes. There is no established Tolerable Upper Intake Level. Long-term safety beyond several months is not well established.

Who should be cautious

Avoid in pregnancy due to possible uterine effects. Avoid in breastfeeding due to insufficient safety data. Avoid in people with peptic ulcer disease, gallstones, or active gastrointestinal bleeding. Use caution in people with diabetes, cardiovascular disease, or those on anticoagulants. Discontinue at least two weeks before scheduled surgery. People with arrhythmias should consult a clinician.

Interactions

Devil's claw may interact with warfarin and other anticoagulants, potentially increasing bleeding risk. May potentiate NSAIDs and could increase gastrointestinal effects. Possible interactions with diabetes medications and antihypertensives. May affect medications metabolized by cytochrome P450 enzymes. May increase stomach acid, potentially counteracting acid-reducing medications.

Frequently asked questions

How long until devil's claw works for arthritis?⌄

Effects typically emerge over 2 to 6 weeks of consistent daily use. Continue for at least 4 weeks before judging whether it is helpful.

Is devil's claw as good as ibuprofen?⌄

Some trials suggest comparable benefit to certain NSAIDs for osteoarthritis or back pain, with better tolerability for some users. Effects are typically modest. Devil's claw is not a substitute for evaluated treatment of severe arthritis.

Can I take devil's claw with NSAIDs?⌄

Discuss with your clinician. Combining may produce additive effects but also additive risks, particularly gastrointestinal effects.

Is devil's claw safe long-term?⌄

Most clinical trials have run 4 to 12 weeks. Longer-term safety is not well established, though traditional use has been long-standing. Discuss extended use with your clinician.

Why shouldn't I take devil's claw with ulcers?⌄

Devil's claw may increase stomach acid and can worsen peptic ulcer symptoms. Avoid use if you have active peptic ulcer disease or gallstones.

References

  • ChEBI: procyanidin B1 — ChEBI Database link
  • Wikidata: Harpagophytum procumbens — Wikidata link

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.