An annual of southern United States to Mexico having large whitish or yellowish flowers mottled with purple and a long curving beak.

Devil's claw has been used traditionally to treat pain, fever and stimulate digestion. European colonists brough it back to their home-land where it became a popular treatment for arthritis.

A typical dosage of devil's claw is 750 mg 3 times daily of preparation standardized to contain 3% iridoid glycosides.

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