Olive leaf (Olea europaea) comes from the olive tree, a native of the Mediterranean. Although olives and olive oil are used as foods, olive leaf is primarily used medicinally by the ancient Greek. The use of olive leaves for medicinal purposes dates back to ancient Egypt, where they were considered a divine symbol as well as a popular remedy to combat fever. Similarly, Greek culture used it to lower fever.
 

Olive leaves contains the chemical compound Oleuropein, which contains within it the bioactive compound Elenolic Acid. It is the main bioactive compound of olive trees contributing antimicrobial and antiviral functions of olive leaves, and specifically targeting influenza A and B types, as well as para-influenza 1,2,3. A number of clinical studies demonstrate the compound's capabilities in preventing and reducing symptoms of viral and microbial infections, including shortening the duration of cold and flu.
 

Andrographis (Andrographis paniculata), also known as ‘King of Bitter’ or ‘Hempedu Bumi’, is a tropical and sub-tropical herb widely found in South and Southeast Asia. The dark green stem and leaves are the primary source of medicinal use. It is widely used in India, China and Thailand as Traditional Chinese Medicine (TCM) and Ayurvedic Medicine. Andrographis was popularly used as an immune health herb and has been known for its use in fighting against cold, flu and upper respiratory tract infections.
 

Andrographolide, the most biologically active compund in Andrographis, has been demonstrated to exhibit diverse pharmacological activities, including antiviral, anti-inflammatory and hepatoprotective effects. Andrographis is gaining popularity in the West for its ability to support the immune system and as a cold and flu remedy. It has been shown to hasten recovery from the common cold and increase the immune system’s resistance to prevent cold episode onset.