The word Salvia, in its Latin name, means "to heal," and evidently sage has been recommended throughout history for nearly every disease you can think of. My instinctive reaction was that this is probably because it smells so good, you feel like it has to be good for you, but then I plugged Salvia officinalis into Pubmed and learned that there's actually some evidence that it's a beneficial antioxidant and might have some impact on Alzheimer's.
Salvia officinalis is native to Europe and Asia Minor.

Phylum/division: Magnoliophyta
Class: Magnoliopsida
Order: Lamiales
Family: Lamiaceae
Genus: Salvia
Species: S. officinales