From the Manufacturer:
Oregano, origanum vulgare, is a member of the mint family and is widely cultivated in the Mediterranean countries. Early Greek physicians used oregano oils to aid in healing wounds, relieving headaches, and even counteracting Hemlock poisoning. Modern day researchers have discovered other uses for oregano. Known for its anti-viral, anti-bacterial, anti-parasitic, anti-fungal and antiseptic properties, some practitioners use it externally for its strong, analgesic and anti-rheumatic qualities. Diluted it may be rubbed on a toothache to relieve pain.
Numerous scientific studies have verified the medicinal properties of high-grade oregano oil. Several studies have shown that oregano oil can destroy or inhibit the growth of a number of strains of bacteria, fungi and parasites. A study published in 2000 in the Journal of Applied Microbiology showed oregano oil to be effective against 25 different bacteria. A 2001 study by researchers at the University of Tennessee confirmed oregano oils anti-bacterial function. The International Journal of Food Microbiology published a 1988 study indicating oregano oil to be effective against nine different fungi.