Basil

The leaves and seeds of the basil plant are the important medicinal parts of this herb, which is regularly used in cuisines and recipes all over the world. Basil essential oil is popular in Europe, Central Asia, India and Southeast Asia. The oil is extensively used for culinary purposes in the Mediterranean region and still forms the active ingredient of many Italian recipes such as pesto. It is also used when making pasta and salads.
Basil was widely used in ancient times in place like India for various medicinal purposes (Ayurvedic medicine). The herb was used to treat diarrhea, cough, mucous discharges, constipation, indigestion, and certain skin diseases.