The Essential Oil of Geranium is extracted through steam distillation of stems and leaves of the Geranium plant, bearing the scientific name Pelargonium Odorantissimum. The main components of this oil are Alpha Pinene, Myrcene, Limonene, Menthone, Linalool, Geranyl Acetate, Citronellol, Geraniol and Geranyl Butyrate. A popular skin therapy, the essential oil treats a host of problems including inflammation, eczema, acne, burns, infected wounds, fungus (like ringworm), lice, shingles, and herpes (source).
Geranium Oil has a very pleasant and uplifting aroma, comparable to a combination of floral fragrances and mint. That property makes it a popular active ingredient for deodorant use. Its effects also last for a long time and it is not harsh on the skin. Furthermore, owing to its property as a mild antibacterial substance, it aids in eliminating body odor. Unlike other substances whose odors are released in exhalation, geranium oil is a circulatory oil, which means that it exits the body during perspiration. Excess physical activity is usually the time when body odor becomes more apparent, but sweating actually releases the pleasant aroma of geranium oil. (Source)