Nature's Way Horny Goat Weed - Traditionally used for centuries in China and Japan for libido enhancement, this herb is also used for disorders of the kidneys, joints, liver, back and knees. Horny Goat Weed's most common use is as an aphrodisiac. Through research, Horny Goat Weed has been found to have testosterone-like effects. It stimulates sexual activity for both men and women, increases male sperm production, stimulates the sensory nerve endings, and increases overall sexual desire.