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| | Menthol + Peppermint | Turmeric + Black Pepper | Copaiba Balsam | Eucalyptol + Rosemary | Lemon + Lime | Spearmint |
| Primary Compound | Menthol + Mentha Piperita | Curcumin, Tumerone + Piperine | Beta-caryophyllene | 1, 8 Cineole | Limonene | Carvone |
| Benefit | Respiratory Function, Physical/Mental Performance, Reduced Fatigue, Higher Alertness, Improved Memory | Improved Cognitive Function, Promotes Neuron Growth | Neuroprotection, Improved Memory | Mental Performance, Respiratory Function, Reduce Fatigue | Improved Learning and Performance, Cognitive Function, Neuroprotection, Memory | Improved Cognitive Function, Athletic Performance, Neuroprotection |
| Key Study Results | "We found improvement in Auditory and Visual reaction time and Number countdown test which were statistically signicant. This suggests peppermint aroma exposure even for a short time such as 5 min improves math function to a great extent." | "(Oral) Treatment with curcumin significantly increased the BDNF protein levels in the hippocampus of stressed rats compared to control" | Provides a pleasant aroma. | Increased speed of reaction time, increased intensities of theta and alpha brainwaves. | 54% of participants made fewer typing errors when they could smell lemon | Significant increase in Forced Expiratory Volume and Forced Vital Capacity after inhalation. Significant reductions in running time were observed. The normal spirometry results were 50 %, while after inhalation of spearmint oil the ratio were 60 %. |
| Key Study Results | Participants in the peppermint scent condition showed greater improvements, such as completing significantly more levels, more hits, more stars, and distance completed. Further, participants reported less mental demand, perceived effort, and anxiety. | Aromatic (ar-) turmerone, a bioactive agent of turmeric oil hinders microglia to be activated. | Promotes alert relaxation. | "Performance on cognitive tasks is significantly related to concentration of absorbed 1,8-cineole following exposure to rosemary aroma, with improved performance at higher concentrations." | It was concluded that lemon essential oil reduced 'test taking fear' by 43.3%. | Computerized cognitive function scores improved in reasoning and attention/concentration after 30 days of supplementation. After acute administration, subjects had improved attention/concentration in two tests at 2 and 4 hours. |
| Key Study Results | The peppermint odor condition resulted in increases in running speed, hand grip strength, and number of push-ups. | In humans, curcumin bioavailability was increased by 2,000% at 45 minutes after co-administering curcumin orally with piperine. | | "When 22 young adults sniffed rosemary oil for 5 minutes, their saliva had 23% lower levels of cortisol compared to those who smelled a non-aromatic compound." | All patients showed significant improvement in personal orientation related to cognitive function on both the GBSS-J and TDAS after aromatherapy. | Improvement in quality of working memory and spatial working memory accuracy, ability to fall asleep, vigor-activity, and alertness and behavior following wakefulness. |
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