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Various species of yucca plant were used as food by Native Americans and early California settlers. Yucca contains high levels of soapy compounds known as saponins that also made it a useful natural shampoo and soap.
One double-blind placebo-controlled trial reported in 1975 concluded that use of yucca reduces arthritis symptoms (both osteo- and rheumatoid arthritis ). 1 However, this study was highly preliminary in nature, and there has not been any subsequent confirming evidence.
Animal and test tube studies suggest that various yucca extracts may have antiviral, antifungal, antiprotozoal (e.g., Giardia) and antibacterial effects, 2 3 4 but no human trials have been reported for potential uses based on these actions.
Yucca extracts are also widely used to enhance the foaming effect of carbonated beverages.
Yucca is generally accepted as safe based on its long history of use as a food. However, it sometimes causes diarrhea if taken to excess. Safety in young children, pregnant or nursing women, or those with severe liver or kidney disease has not been established. Yucca may have slight estrogen-like actions, 5 and for this reason should not be taken by women who have had breast cancer.