Allspice Oil� is a wonderful oil to use in the diffuser during the fall and winter. If used at full-strength, it can be a potent mucous membrane irritant, so it\'s best blended at a low ratio with other essential oils before diffusing. I particularly like Allspice Oil blended with Orange Oil or Bergamot Oil. As one of the best� essential oils suppliers, the Allspice Essential Oil\'s high Eugenol (a phenol) content suggests that Allspice may act as an anti-viral oil.