"A 2024 peer-reviewed study (Kokubun et al., Brain Research Bulletin, PMID 38331299) found that healthy women who wore diluted rose essential oil on their clothing twice daily for 30 days showed significant increases in whole-brain gray matter volume (GMV) and specifically in the posterior cingulate cortex (PCC) on MRI scans.
pubmed.ncbi.nlm.nih.gov
The control group (using plain water) showed no such changes. This is presented as the first evidence that continuous scent inhalation (aromatherapy via rose oil) can structurally alter the adult human brain, potentially supporting neuroplasticity, memory, and emotional processing.
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