Dangerous Essential Oils:
This is for Essential oils that would be taken internally and or directly on the skin and not cut with a carrier oil, as for massage use.
Basil-This oil should not be used at all
Bergamot-If used on skin and exposed to sunlight it can cause a severe sunburn
Camphor-Prolonged inhalation can cause headaches.
Cinnamon bark and leaf-Skin irritant. Do not anoint or use in a bath.
Clary Sage-Not to be used with alcohol. Prolonged inhalation can cause headaches.
Clove-bud-leaf-stem-Skin irritant do not anoint or use in a bath.
Fennel-Bitter-Irritant, causes epileptic attacks, not to be used by pregnant women
Frankincense-May irritate the skin
Hyssop-Causes epileptic attacks, possibly other problems, do not use if pregnant.
Lemon-Irritant, do not anoint or use in a bath.
Lemon Balm-Irritant, do not anoint or use in a bath.
Lemon Verbena-Irritant, do not anoint or use in a bath.
Marjoram-Not to be used by pregnant women.
Mugwort-Hazardous Should not be used
Myrrh-Irritant, do not use if pregnant.
Oregano-Irritant, do not use if pregnant.
Pennyroyal-Toxic, Do not use
Rue-Dangerous do not use
Sage-Toxic, Do not use
Thyme-Toxic, Do not use
Ylang Ylang-May cause headaches from prolonged exposure.
Now remember these are the Essential Oils not the herbs themselves