Devil's Claw
Harpagophytum procumbens
Production
Harpagophytum procumbens, known as Devil's Claw or Grapple Plant, is one of the most extensively researched and commercially significant medicinal plants in southern Africa. The plant takes its dramatic name from its woody fruit, covered in long hooked claws that entangle in the fur and hooves of passing animals for seed dispersal. It grows as a low-spreading perennial in the deep red sands of the Kalahari, producing striking tubular pink to purple flowers and developing large primary and secondary tubers that can reach 1.5 metres deep in the sand. These tubers — harvested, dried, and sliced — have been used by San and Khoi communities for centuries to treat pain, fever, and digestive complaints. Devil's Claw entered European herbal medicine in the early 20th century through German colonial research in Namibia and is now one of the top-selling herbal medicines in Germany, France, and the UK, primarily for arthritis, back pain, and musculoskeletal inflammation. South Africa and Namibia are the world's primary sources, and the export industry is worth tens of millions of rands annually.
- Harpagoside (primary iridoid glycoside — anti-inflammatory bioactive)
- Harpagide
- Procumbide
- Beta-sitosterol
- Flavonoids (luteolin, kaempferol)
- Triterpenes (oleanolic acid, ursolic acid)
- Tuber decoction taken for arthritis, rheumatism, and joint pain
- Used for fever, malaria, and general pain relief
- Taken for digestive complaints including loss of appetite and dyspepsia
- Applied topically for skin lesions, boils, and ulcers
- Used during pregnancy for pain management by San communities
- Taken as a bitter tonic for liver and gallbladder support
- Harpagoside demonstrated significant COX-2 inhibition — anti-inflammatory mechanism comparable to NSAIDs (Fiebich et al., 2001)
- Reduction in chronic low back pain confirmed in multiple randomised controlled trials (Chrubasik et al., 2003)
- Efficacy for osteoarthritis of the hip and knee demonstrated in systematic review (Brien et al., 2006)
- Improvement in pain scores and mobility in rheumatoid arthritis patients in open clinical study
- Approved as a traditional herbal medicine for musculoskeletal pain by the European Medicines Agency
Arid Kalahari sand. Extremely drought-tolerant. Full sun. Deep well-drained sandy soils essential. Cannot tolerate waterlogging. Rainfall 200–400mm per annum.
Northern Cape (Kalahari Gemsbok area), North West Province, and across the border into Botswana and Namibia
Predominantly wild-harvested under permit in South Africa, Namibia, and Botswana. South Africa exports approximately 800 tonnes of dried tuber annually. The industry is regulated by DAFF and provincial conservation authorities. Cultivation trials have been conducted but commercial plantation production remains unestablished due to the plant's slow growth and deep tuber development.
The San people of the Kalahari have used Harpagophytum procumbens as a medicine for thousands of years. The secondary tubers were dug from deep in the sand — a laborious process requiring knowledge of the plant's growth patterns and the right season for harvest. San healers prepared decoctions of the dried and sliced tuber for pain, fever, and digestive complaints. The bitter taste was considered a sign of potency. Pregnant San women used dilute preparations for pain management during labour — though this use is now contraindicated in herbal medicine guidelines due to the plant's uterine stimulant potential. The introduction of Devil's Claw to European medicine came through German farmer Georg Mehnert, who learned of the plant's properties from Namibian San and Khoi communities in the early 1900s and sent samples to Germany — one of the most directly traceable pathways of indigenous knowledge transfer into Western herbal medicine. Benefit-sharing frameworks for the San communities whose knowledge underpins this global industry remain inadequate and are a subject of ongoing advocacy.