“Specifically it greatly reduces the structural changes that occur in the hippocampus [a part of the brain associated with memory and spatial orientation] during prolonged stress thus maintaining normal memory function,” he explained.
— Dr Nickolas Lavidis of Queensland University, Australia, explains how his product, SerenaScent (which apparently smells like freshly cut grass), works. You can read more at Stress relieving scent has ‘enormous’ potential for fragrances and cosmetics at Cosmetics Design, or check out the SerenaScent website, where a 50 ml spray is $7.90 AUD.