Nature's Herbs cayenne (capsicum) grows in nutrient-rich soil in China and is standardized at 40,000 stu's (scoville thermal units), the method of measuring the quality of cayenne by the American spice trade association. Guaranteed to contain whole-herb active compounds (capsaicin) for natural health benefits. Cayenne contains capsaicin, the source of the heat in hot peppers. Capsaicin and substances that contain it are among the most studied of substances in medical, pharmaceutical, and nutrition research. Although many of the claims have not yet been substantiated by scientific research, some of these uses have been around for hundreds of years, and they seem to work for many, many people: Capsaicin: improves digestion by stimulating stomach secretions lowers triglycerides has a laxative effect triggers the release of the body's natural painkillers, the endorphins unclogs stuffy noses by irritating mucus membranes may reduce high blood pressure may protect against some forms of cancer.