There are only a few conifer (Pine, Spruce or Fir) oils that contain a significant percentage of d-limonene.
The Aromahead Blog - Aromatherapy Education and Resources
Engelman Spruce from Utah
by Andrea Butje, LMT, Aromatherapy Educator on
June 24, 2011
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Preventing Colds and Flu
by Andrea Butje, LMT, Aromatherapy Educator on
September 20, 2009
A guest post by Cindy Black. For more from Cindy, stop by her blog at the Meridian Massage Institute.