Cayenne powder starts as dried, ground chili peppers. Many people take it to stimulate appetite or ease mild indigestion. Others use it inside creams and poultices for muscle soreness. You can sprinkle it on food or stir it into warm water or tea.
Keep it away from your eyes and broken skin. Large amounts might irritate your stomach. Cayenne can interact with blood thinners like warfarin and aspirin.