An anti-microbial composition is provided. The anti-microbial composition includes a first ingredient obtainable from ginger, a second ingredient obtainable from green tea, an optional third ingredient available from turmeric, and, optionally, an acceptable carrier. Also provided are methods of reducing, treating or preventing at least one symptom or adverse effect of microbial infection in a patient. The methods include the step of administering to the patient prior to expected exposure to a microbe, concurrently with exposure to a microbe, or after exposure to a microbe, an effective amount of a composition of the invention.