Important substances Chili peppers have a spicy taste because they contain a substance, capsaicin, which is a natural alkaloid, colorless, odorless, resistant to heat and cold. Therefore, boiling or freezing will not cause the loss of the spiciness. properties - Relieve flu symptoms and make breathing more comfortable. Capsaicin in chili peppers helps reduce mucus. or an obstruction in the respiratory system due to the flu Sinus or allergies Help relieve cough food. - Reduce the blockage of blood vessels. Blood clots are a leading cause of heart failure. Eating chili regularly will help reduce the risk of both types of diseases, help with good blood circulation, reduce blood pressure. - pain relief Humans have long used chili peppers to relieve pain, such as toothache. sore throat relief and inflammation of the skin.