These oils should NEVER be used by anyone as they could cause organ damage, neurological damage, spontaneous abortion, and even death:

  • Dwarf Pine
  • Mugwort
  • Pennyroyal
  • Rue
  • Tansy
  • Thuja
  • Wormwood

These oils should be AVOIDED, and only used by knowledgeable aromatherapists as they have been associated with things like liver and neurological damage:

  • Aniseed
  • Camphor
  • Hyssop
  • Origanum
  • Parsley
  • Sage

These oils should not be used by EPILEPTICS as they can provoke seizures:

  • Eucalyptus
  • Fennel
  • Hyssop
  • Rosemary
  • Sage

These oils should be avoided during PREGNANCY. Many of them mentrual regulators and, while that's usually a good thing, they can cause miscarriage:

  • Angelica
  • Arnica
  • Basil
  • Bay
  • Camomile (first trimester)
  • Carrot Seed
  • Cassia
  • Cedarwood
  • Cinnamon leaf and bark
  • Clary Sage
  • Cypress
  • Fennel
  • Geranium
  • Jasmine
  • Juniper
  • Lavender (first trimester)
  • Lavender Spike
  • Melissa
  • Marjoram
  • Myrrh
  • Peppermint (also contra-indicated during nursing)
  • Rose (first trimester)
  • Rosemary
  • Spearmint
  • Thyme

These oils cause PHOTOSENSITIVITY and should not be applied to the skin before being in the sun:

  • Angelica
  • Bergamot
  • Cumin
  • Lemon
  • Lime
  • Orange
  • Verbena