Researchers from Kyoto University and the University of Tsukuba in Japan asked 28 women to wear a specific rose scent oil on their clothing for a month, with another 22 volunteers enlisted as controls who put on plain water instead.
Magnetic resonance imaging ( MRI) scans showed boosts in the gray matter volume of the rose scent participants.
— Read more in Smelling This One Specific Scent Can Boost The Brain's Gray Matter at Science Alert.

