Ginseng

Ginseng (GS) is a medicinal plant which is used frequently as a reagent in traditional Britannian and  Serpent Islander magical practices. On Earth, it has long enjoyed a reputation in traditional Chinese medicine and western herbalism as a rejuvenating mental and physical stimulant and some of these properties appear to have likewise been seized upon by Britannian healers.

Britannia
The medical practitioners of Britannia have long commended the healthful and restorative powers of the ginseng root, and it has a history of use by warriors and laymen alike as an adaptogen - giving those who ingest it increased stamina for labor or for battle. Among magicians, ginseng requires special preparation before it can be employed in the mystic arts, and the root of the plant must be boiled no less than forty times in successive changes of fresh water, such as that it is reduced to a strong-smelling syrup which may be used to power spells of a medicinal or narcotic nature.

Originally native only to the slopes of Britannia's northern mountains, ginseng was later cultivated in greenhouses across the realm to keep up with the demand for the reagent, and it could frequently be purchased from mages and herbalists.

Earth
The panax (from the same root as the Greek panacea) genus of plants has a long historical reputation in Terran herbal medicinal traditions as an aphrodisiac, adaptogen, muscle relaxant and nourishing stimulant, and has long proved a profitable herb to market to those seeking its alleged rejuvenatory properties. It often bifurcated tap-root is said to resemble a human figure (much like mandrake), and it is from the Chinese term renshen (人蔘) or "man root" that its English name derives. Although its cure-all repute is not backed by many modern scientific studies, these plants often have a solid association with curative and stimulating effects in Terran consciousness. 

Lore