http://health-compendium.com/index.php?option=com_content&task=view&id=30&Itemid=9

Read all of that there. At which rate though and how much? I don't know, but honestly why not use the real thing?

In Sanskrit, tulsi means literally "the incomparable one" and has been revered since ancient times. Tulsi, the holy basil, is said to have grown at the site of Christ’s crucifixion and is associated with St. Basil’s feast.