Harpagoside

PhytochemicalIridoid glycosideBest with a meal

What is it

Harpagoside is an iridoid glycoside compound found primarily in devil's claw (Harpagophytum procumbens) root. It is the main marker used to standardize devil's claw extracts for joint and back pain support.

Evidence for 2 uses

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

Osteoarthritis / joint pain

Good Evidence

Several randomized trials of standardized devil's claw extracts containing harpagoside show modest pain reduction in hip and knee osteoarthritis, comparable to low-dose NSAIDs in some studies.

Low back pain

Good Evidence

Cochrane reviews of devil's claw with harpagoside report short-term pain improvement in chronic low back pain.

How it works

Harpagoside appears to inhibit pro-inflammatory enzymes including COX-2 and reduce production of inflammatory cytokines such as TNF-alpha and interleukin-6 in cell models. It is the compound most often credited with devil's claw's analgesic and anti-inflammatory effects, though other iridoids and phenolic compounds in the plant likely contribute. Clinical research mostly tests standardized devil's claw extracts rather than isolated harpagoside, so dose-response data for the pure compound are limited.

Dosage

Devil's claw extracts are commonly standardized to 50-100 mg harpagoside per day, delivered through 600-2400 mg of extract.

When and how to take it

Typically taken in divided doses with meals to reduce stomach upset. Anti-inflammatory effects build over 2-8 weeks of consistent use.

1 commercial form

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Devil's claw extract standardized to harpagoside

Most clinical evidence comes from these extracts, not isolated harpagoside.

Standardized extracts (commonly 2-3% harpagoside) are the studied form.

Safety

Generally well-tolerated. Side effects include mild gastrointestinal upset and headache. Rare allergic reactions reported.

Who should be cautious

Avoid in active peptic ulcers, gallstones, or biliary obstruction. Avoid during pregnancy due to potential oxytocic effects. Caution with NSAIDs, anticoagulants, and antidiabetic medications.

Interactions

May enhance the effects of NSAIDs and anticoagulants such as warfarin. Theoretical interactions with antidiabetic drugs and stomach acid medications.

Frequently asked questions

Is isolated harpagoside available?⌄

Most products use standardized devil's claw extracts. Pure harpagoside is mainly used in research.

How fast does it work?⌄

Pain relief in trials typically builds over 4-8 weeks, not immediately.

References

Harpagoside on Wikidata — Wikidata link

Harpagoside (ChEBI:5625) — ChEBI link

Harpagoside (PubChem CID 5281542) — PubChem link

Harpagoside on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Harpagoside (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

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.