Natural Factors Cayenne - 42,000 Heat Units - Cayenne has been a popular herb for centuries and is used extensively to improve arterial circulation and to reduce cholesterol levels. It is well documented for its restorative effects on the digestive system and has been used successfully to heal bleeding stomach ulcers and as a remedy for the common cold and to clear sinuses. More recently, cayenne's active ingredient, Capsaicin has shown good results in the treatment of arthritic pain and relief from rheumatoid arthritis.