Free radical activity in our bodies is related to inflammation, aging, and carcinogenesis. Our bodies have various anti-oxidative systems (free radical scavenging activity - FRSA) for preventing oxidative stress.
A 2007 clinical study published in Psychiatry Research, revealed that the FRSA values were increased by low concentrations of lavender essential oil, or by high-concentrations of rosemary essential oil. Both lavender and rosemary essential oils decreased cortisol levels. Rosemary essential oil showed a significant reduction of cortisol levels as increasing amounts of Rosemary essential oil was added.
The researchers concluded that the study results show that lavender and rosemary essential oils enhance FRSA and decrease the stress hormone cortisol, thereby protecting the body from oxidative stress and the damage it causes.