When the weather turns cold, a lot of people notice their backs and knees more. That’s usually when they start browsing the joint-support shelf, and alongside the familiar glucosamine and turmeric bottles they’ll often find an herb with a memorable name: devil’s claw.
The name comes from the plant’s fruit, which is covered in hooked barbs that catch on animals’ feet. The part used medicinally is the root. Devil’s claw is also one of the few herbal pain remedies that has been tested against placebo, and in a couple of cases against a conventional pain reliever, in people with ordinary back and joint pain. That doesn’t make it a sure thing. Here’s what those trials found and how to use it without running into its known problems.
What Devil’s Claw Is
Devil’s claw (Harpagophytum procumbens) grows in the Kalahari region of southern Africa, mainly in Namibia, Botswana, and South Africa. Traditional healers used the dried secondary roots (tubers) for pain, fever, and digestive complaints. European herbal practice adopted it in the twentieth century, and it’s now a common joint remedy in Germany and elsewhere in Europe.
The compound most research focuses on is harpagoside, an iridoid glycoside. Products are usually standardized to a percentage of harpagoside, which is the most useful thing to look for on the label. If you’re not sure how to read those numbers, our guide to standardized extracts explains the math.
How It Might Work
Lab studies suggest harpagoside and related compounds can dampen several inflammatory signals, including enzymes and messenger molecules involved in pain and swelling. How much of that happens at the doses people actually take is still unclear. Other constituents of the root may contribute, which is one reason whole extracts sometimes outperform isolated harpagoside in lab work.
The honest version: the mechanism is plausible but not well mapped in humans.
What the Research Shows
Low back pain
This is the best-studied use. Several randomized, placebo-controlled trials in adults with flare-ups of non-specific low back pain found that extracts delivering around 50-100 mg of harpagoside a day produced more pain relief over about four weeks than placebo. In some trials, more people on devil’s claw became pain-free by the end or needed less rescue medication.
Systematic reviews of herbal remedies for low back pain have generally concluded that devil’s claw looks promising, with evidence of low to moderate quality. Many of the key trials are small, a number are more than a decade old, and some used proprietary extracts supplied by their makers. The effect in positive trials was real but moderate, not dramatic.
Knee and hip osteoarthritis
Trials in osteoarthritis have reported improvements in pain and stiffness scores over roughly 8 to 16 weeks. One comparison trial found devil’s claw and a conventional prescription pain reliever produced similar symptom relief in knee and hip osteoarthritis. It’s an interesting result, but a single trial with methodological limits can’t establish equivalence, and nobody should swap a prescribed medication for an herb on the strength of it.
What it doesn’t do
- It doesn’t rebuild cartilage or change the course of osteoarthritis. The evidence concerns symptoms only.
- Evidence for inflammatory arthritis, such as rheumatoid arthritis, is weak. Those conditions need medical management.
- It isn’t fast. Unlike an over-the-counter pain reliever, it isn’t useful for pain you want gone in an hour.
How It Compares to Other Joint Supplements
Devil’s claw sits in a similar evidence tier to boswellia and curcumin: modest symptom relief in some trials, inconsistent quality, no disease-modifying effect. Its distinguishing feature is a stronger research focus on low back pain, where most joint supplements have little data. For a broader view of seasonal joint complaints, see our look at cold-weather joint stiffness.
Combining several anti-inflammatory herbs is common, but it raises the odds of stomach upset and bleeding-related interactions without much evidence that the combination works better.
Dosing
Based on the trials:
- Extract dose: typically 600-1,200 mg/day of a standardized extract, chosen so it delivers roughly 50-100 mg of harpagoside per day. Check the label: a 500 mg capsule standardized to 5% harpagoside provides 25 mg.
- Split doses: most regimens divide it into two or three doses.
- With food: taking it with meals may reduce stomach upset.
- Timeline: allow 2-4 weeks. If there’s no meaningful change by around 8 weeks, it likely isn’t helping.
- Duration: most trials ran up to about 4 months. Longer-term safety data are limited, so periodic reassessment with your clinician makes sense.
Raw powdered root and teas are less predictable in harpagoside content, and teas are very bitter.
Safety
At trial doses, devil’s claw has generally been well tolerated over weeks to months. The most common side effects are digestive: diarrhea, nausea, stomach discomfort, and occasionally headache or loss of taste.
Who should avoid it or check first
- Stomach ulcers, gastritis, or reflux. Devil’s claw is thought to stimulate stomach acid, which is the reason for its traditional use as a digestive bitter and also why it can aggravate these conditions.
- Gallstones. It may increase bile flow.
- Blood thinners. There are reports suggesting possible interactions with warfarin, and combining it with anticoagulants, antiplatelet drugs, or regular NSAID use warrants a clinician’s input.
- Heart and blood-pressure conditions. Animal studies at high doses showed effects on heart rate and blood pressure. People taking heart-rhythm or blood-pressure medication should check first.
- Diabetes medication. It may lower blood sugar, which could add to the effect of glucose-lowering drugs.
- Other medications. Lab studies suggest it can affect liver enzymes that break down many drugs. A pharmacist can check your list.
- Pregnancy and breastfeeding. Safety hasn’t been established, so avoid it.
When back pain needs a doctor instead
Most back pain improves on its own, but see a clinician promptly for back pain with numbness or weakness in the legs, loss of bladder or bowel control, fever, unexplained weight loss, a history of cancer, or pain after a fall or injury. A supplement isn’t appropriate for any of those.
Bottom Line
Devil’s claw has more controlled research for low back pain and osteoarthritis than most herbs, and it may modestly reduce pain for some people over several weeks. The trials are small and not recent, it doesn’t slow joint damage, and it has real cautions for people with stomach problems, gallstones, or medications that affect bleeding, blood pressure, heart rhythm, or blood sugar. If you want to try it, choose an extract that states its harpagoside content, aim for about 50-100 mg of harpagoside a day with meals, and judge it after 4 to 8 weeks. Keep up movement and physical therapy, which remain the best-supported approaches for most back and joint pain.
This article is for educational purposes only and is not medical advice. Consult a healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medication, or managing a health condition.