Abstract
Ocimum, commonly known as Tulsi, is a huge genus within familyLamiaceae, comprising about 64 species of annual to perennial aromatic medicinal herbs with a long history of traditional uses. The aromatic plants of the genusOcimumhave long been used as flavouring agents, as well as diverse medicinal applications. Our comprehensive review covers the published literature through the period from 1961 to April 2019 and provides a complete survey of nearly all the studied species up to date. Additionally, all related taxonomic data, geographical distribution as well as different traditional uses are discussed here in details. The major chemical classes within the genusOcimuminclude flavonoids, phenolic acids and terpenes. The bioactivities of various extracts or individual compounds, both in vitro and in vivo, include antimicrobial, cytotoxic, antinociceptive, anti-inflammatory, antihyperglycemic and antioxidant. This comprehensive review will serve as a database for future research and drug development from the genusOcimum.