Capsaicin is the main irritant in pepper fruit and an extremely spicy vanillin amide alkaloid.

It has a variety of complex physiological and pharmacological activities, and has great influence on some sensory nervous systems, cardiovascular, lung functions, thermoregulation and gastrointestinal functions, and contains substance P.

It has the functions of diminishing inflammation, relieving pain, promoting fat metabolism and tear gas, among which its unique long-term analgesic effect is more prominent. Capsaicin has been recorded in the 24th edition of USP,

Widely used in the treatment of arthritis, muscle pain, backache, sports sprain, neuralgia after herpes zoster and so on. It is used as a variety of drugs in pharmaceutical production, such as analgesia, anti-inflammation, frostbite, itching relief, sterilization, detoxification, wind-dispelling and dehumidification.