American basil (Ocimum americanum), also known as hoary basil or wild basil, has a history of use in traditional medicine systems in various parts of the world, including Africa and Asia. In ethnobotanical records, American basil and other Ocimum species have been employed for a wide range of ailments, such as headaches, digestive issues, and sometimes for symptoms like dizziness or faintness. However, these uses are primarily based on traditional or folk practices rather than robust scientific studies.

The rationale for using American basil for dizziness in traditional systems often relates to its reputed effects on circulation, calming properties, or its aromatic qualities, which are thought to "clear the head." Despite these traditional claims, there is minimal direct scientific evidence supporting the effectiveness of American basil for the treatment of dizziness. Most of the available literature focuses on its antimicrobial, anti-inflammatory, or antioxidant properties, not specifically on vertigo or dizziness. No well-controlled clinical trials have examined its efficacy for this indication.

In summary, the use of American basil for dizziness is justified primarily by tradition, with little to no scientific validation. The evidence supporting this use is weak, largely anecdotal, and based on historical practices rather than modern research.