Prairie Naturals Tongkat Ali - Helps promote testosterone production in men and provides a source of antioxidants. Also known as Eurycoma longifolia, Tongkat Ali is a plant native to Southeast Asia that has been traditionally used for various medicinal purposes. Tongkat Ali is believed by some to have adaptogenic properties, meaning it may help the body adapt to stress and regulate cortisol levels. This could potentially have a positive impact on overall well-being.