This formula is best used when symptoms first arise, so this is a popular formula to be kept in homes at all times. When taken at the first signs of illness, including sore throat, congestion, nasal drainage, cough, headache, achiness, etc., the formula excels at clearing these symptoms before they prolong or turn into deeper conditions such as sinus infections, bronchitis, etc. When traveling or others around you are sick, this is also an excellent formula for preventing illness and boosting immunity.