Wintergreen is great addition to diffusers.  When dilutted properly, Wintergreen oil can be refreshing and uplifting, It can also be used in for sports injuries.
 
Botanical Name:   Gaultheria fragrantissima or Gaultheria procumbens
Extraction Method: Water or Steam Distillation
Part Used: Leaves
Aroma Strenght: Strong
Note:   Top
Aromatic Description -   Crisp, fresh, woody, sweet, birch-like aroma.
Origin:  China
Constituents: Methyl salicylate: 96.0-99.5%
Blends well with:  Ylang- Ylang, Peppermint, Marjoram, Lavender, Birch Sweet and Vanilla.
Cautions:  For external use only. Do not apply undiluted directly on skin.   May cause irritation on some individuals.