Spicy degree is determined by capsaicin (such as capsaicin and piperin) in pepper. The higher the spicy degree, the stronger the spicy taste. The concept of 9 million spiciness indicates that this kind of food is extremely spicy, which is more spicy than ordinary peppers. Some famous pepper varieties, such as carolina reaper pepper and Longyan pepper, are known as one of the hottest peppers in the world, and their spiciness can reach more than 9 million.

9 million hotness is a measure of food hotness.