Are there any good fat burners that lack st. john's wort?

Fat burners: Honestly, the best fat burner is cardiovascular exercise. Herbal supplements are not regulated by the fda which makes then potentially dangerous. I have personally taken care of several patients who have gone into acute liver failure as a result of taking herbal supplements for weight loss. Some even requires a liver transplant. Is it really worth it? Eat healthy and exercise. It's much safer.