SAGE
1 kg of sage oil is obtained from steam distillation with approx. 50 kg of the herb.
Here, 6 studies on humans show that the smell of sage has a positive effect on cognitive functions. This leads to increased attention, word recall and memory speed.
The mood-enhancing properties can also lead to greater alertness, calmness and contentment.
Source:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5318325/#!po=43.4066