6- Sage (Salvia officinalis)
The traditional herbal medicine considered sage as a brain-boosting herb, and modern studies confirmed it. A study conducted on British healthy adults showed that those who took Spanish sage oil capsules has better results on a word-recall test than those in a control group all the time.
Apparently, this herb includes a compound which inhibits the same enzyme which is targeted by drugs involved in the treatment of memory loss in the case of Alzheimer’s disease.
Additionally, it has powerful antiseptic properties, so it is the best natural remedy for a sore throat. In this case, you should drink sage tea or gargle with a much-diluted solution of the liquid (10-20 drops) in a cup of warm water.
On the other hand, people suffering from Alzheimer’s are advised to take 30 drops of the liquid extract 2-3 times daily, as well as individuals who would like to boost their sharpness.
Caveats: there is no risk if you use sage normally or add it to foods, but you should never take it in excessive amounts and too long, as it may lead to seizures.