Health Benefits of Basil

15. Safely Using Basil

Basil is likely safe when consumed in foods or taken as a supplement. It's crucial to note, however, that basil contains estragole, a chemical that can increase liver cancer risk. Most people tolerate basil topically, and it is considered safe for skin in concentrations of up to 6% for approximately four months. At this time, there is little research around basil in aromatherapy or its side effects. Evidence suggests basil may lower blood pressure and could be dangerous for people with already low readings. People with clotting disorders or those taking blood thinners should avoid it because basil slows clotting.