(L.) Less: A Review of Its Volatile and Non-Volatile Compounds, Ethnomedicine, Pharmacological Properties and Evidence on Safety Trials in Humans.

(L.) Less. is used as a traditional medicine in South Africa to treat tuberculosis, abdominal pains, heartburn, coughs, colds, female sterility, eczema and wounds. In Uganda, the leaves are used to treat dental/oral diseases. This review aims to provide detailed information on the traditional uses, essential oils, phytochemistry, in silico studies, and pharmacological studies and propose possible future research directions on this widely investigated species. The data was gathered from various online electronic databases such as Science Direct, Scopus, Google Scholar, Web of Science, SciFinder, Wiley Online, SpringerLink, and PubMed. Reports on the essential oil composition ofshowed the dominance of monoterpenoids and sesquiterpenoid compounds. Several studies also reported the isolation of the non-volatile compounds, which were mainly flavonoids and terpenes. The species has been reported to have pharmacological activities such as antimicrobial, antimycobacterial, antioxidant activity, antidiabetic, antiproliferative, anti-inflammatory activity and antityrosinase activity. The most important study onwas a clinical trial in human participants in South Africa addressing its in vivo irritancy potential. However, further research on the clinical and scientific aspects is needed to justify some of its other medicinal uses.