Chillies provide an excellent source of vitamin C and capsaicin. They are often used as a hot spice, especially in ethnic cuisine such as Mexican, Indian, Thai, Vietnamese, Arab, and Spanish cooking. Chillies are effective in stimulating and enhancing digestion. Studies have found that spicy foods do not cause ulcers in healthy individuals. The capsaicin in chillies also has a stimulating effect on the mucus membranes of the nose and sinuses. Studies have shown that capsaicin stimulates blood flow through the membranes and causes mucus secretions to become thinner and more liquid. This action makes it beneficial in combating the common cold and sinus infections.