According to HorizonHerbs.com, tulsi is used traditionally to alleviate stress, high blood pressure, and as a protective agent against cancer. In Ayurvedic medicine it also used to cure colds, headaches, stomach problems and heart problems, although no studies prove it actually helps with these ailments.
Tulsi contains flavanoids, tannins, and traces of zinc, manganese and sodium. According to Drugs.com, it also contains vitamin A and C.
Tulsi looks similar to basil but has hairier, pale-colored leaves with purple or red flowers. The leaves measure three to seven centimeters long.
The three most common types of tulsi include Rama tulsi, Krishna tulsi and Vana tulsi.
The tulsi plant is also called tulasi. In English it is known as holy basil.