Sage

Sage (Salvia officinalis): An excellent antiseptic for treating mouth ulcers and sore throats. Sage is also an important remedy for disorders of the digestive system. The herb is antiseptic, antispasmodic, astringent, carminative, cholagogue, galactagogue, stimulant, tonic and vasodilator.

Sage is used internally in the treatment of excessive lactation, night sweats,  profuse perspiration, anxiety, depression, female sterility and menopausal problems.

Sage had a high reputation throughout the Middle Ages, with many sayings referring to its healing properties and value.
It was sometimes called S. salvatrix (Sage the Savior), and was one of the ingredients of Four Thieves Vinegar, a blend of herbs which was supposed to ward off the plague.
Dioscorides, Pliny, and Galen all recommended sage as a diuretic, hemostatic, emmenagogue, and tonic.

Sage was once recommended by herbalists to treat fever, a usage that probably arose from sage's ability to reduce perspiration. Modern research has demonstrated that sage reduces perspiration by as much as 50 percent, and Commission E, the group that evaluates the safety and efficacy of herbs for the German government, approves the use of sage infusions to treat excessive perspiration. Today, there are sage-based natural deodorants sold at most health food stores.

From the Spanimax List: "15 Top Herbs II"

References:

• The New Book of Salvias; Clebsch, Betsy; Carol D. Barner.
• An Analytical Investigation of Garden Sage; Watters, L. L.
• Salvia officinalis extract in the treatment of patients with mild to moderate Alzheimer's disease: a double blind, randomized and placebo-controlled trial; Akhondzadeh S, Noroozian M, Mohammadi M, Ohadinia S, Jamshidi AH, Khani M.
• The Herb Society of America New Encyclopedia of Herbs & Their Uses; Deni Bown.