“Preliminary studies on holy basil and hairy basil have shown that the leaf and seed may help people with type 2 diabetes control their blood sugar levels. While the action-mechanism of the leaf is not understood, the seed may work by providing dietary fiber, which helps prevent rapid blood sugar elevations after meals. In addition, the seed has been found to relieve constipation by acting as a bulk-forming laxative in one uncontrolled human study. A similar study showed the seeds useful in elderly people who experienced constipation after undergoing major surgery.
The volatile oil of basil has shown antibacterial, antifungal, and antiviral activity in test tube studies. It is also believed to act as a carminative, relieving intestinal gas, and as a mild diuretic, though these actions have yet to be definitively proven.”