Over the years, people have taken tribulus in an attempt to enhance athletic performance, body building, and for a wide range of health issues that may include heart and circulatory conditions and sexual issues.
But does it work? Limited studies show it might be helpful in lessening symptoms of angina and in enhancing athletic performance. There have also been some studies that show some benefit to people with certain sexual problems and those with infertility.
With a lack of research to draw on, it's not clear what a safe dosage is. Also, quality and active ingredients in supplements may vary widely from maker to maker. This makes it difficult to set a standard dose.