ColdNOx is essential during cold and flu season for those who have a weakened immune system and are prone to falling ill. ColdNOx contains Andrographis paniculata extract in combination with a supplemental source of nitric oxide (NO), potassium nitrate. This formula is the WORLD'S FIRST Andrographis paniculata enhanced with a natural source of supplemental nitric oxide. This novel formula reduces the frequency, severity and duration of upper respiratory tract infections. NO acts as a natural antimicrobial and increases circulation to support recovery. Green tea extract and citric acid are also included in AOR's proprietary NOx3,2,1 Technology blend as synergistic agents to improve the body's conversion of nitrate to nitric oxide and to enhance its effectiveness.