Description Harpagophytum procumbens A native of South and Eastern Africa. Used for its analgesic and anti-inflammatory properties, it is useful for treating pain in a range of joint and muscular problems. The bitter action of Devils Claw stimulates and tones the digestive system. As it is thought that most arthritic conditions are associated with poor digestion and absorption of food, Devils Claw has a stimulant effect on the stomach and gall bladder which contributes to its use as an anti-arthritic remedy. Warning: Do not use in pregnant mares as it can stimulate the uterine muscle, and do not use on horses if there is suspicion of gut ulceration.