or use with extreme caution…

The oils listed here are considered common irritants to toxic, depending on use. An oil that may be safe to use in a room fragrance may not be safe to use on your skin. Ones that are listed to avoid, I would do just that…avoid. Unless you have a thorough knowledge and understanding of aromatherapy and have been practicing for years, I would suggest playing it safe. Although you may find the oils are available in stores, that does not mean they are safe!

This is not an exhaustive list by any means and you are urged to seek the guidance of your doctor and/or a reputable and experienced aromatherapist before using any essential oil. Depending on your health, age, and other factors, an oil that is suitable for one person may be dangerous to you. Just because an oil doesn’t show up under a list is not an indication that it is okay for your use. Again, seek the advice of your physician for medical advice and guidance.

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Avoid using due to high toxicity levels or other dangers:
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Ajowan
Aniseed
Arnica
Bitter Almond
Bitter Fennel
Boldo Leaf
Buchu Leaf
Calamus
Camphor (yellow/brown)
Cassia
Chervil
Cinnamon (bark)
Costus
Deertongue
Dwarf Pine
Elecampane
Garlic
Goosefoot
Horseradish
Jaborandi Leaf
Melilotus
Mugwort
Mustard
Narcissus
Onion
Oregano
Parsley Seed
Pennyroyal
Rue
Sage (Common)
Santolina
Sassafras
Savin / Savine
Savory
Southernwood
Spanish Broom
Sweet Birch
Tansy
Tarragon
Thuja
Thyme (Red)
Tonka
Wintergreen
Wormseed
Wormwood

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Use with extreme caution. Only in very small quantities and infrequently if at all:
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Anise Star
Basil (exotic)
Bay Laurel
Bay (West Indian)
Black Pepper
Calaminthe
Camphor (white)
Caraway
Cascarrilla Bark
Cassie
Cedarwood (Virginian)
Cinnamon Leaf
Coriander
Clove Bud
Cumin
Eucalyptus
Hops
Hyssop (avoid completely if high blood pressure or epileptic)
Juniper
Nutmeg
Parsley Leaf
Rosemary (avoid completely if high blood pressure or epileptic)
Sage (Spanish) (avoid completely if high blood pressure or epileptic)
Sweet Basil
Sweet Fennel (avoid completely if epileptic)
Tagetes
Thyme (white) (avoid completely if high blood pressure)
Tuberose
Turmeric
Turpentine
Valerian

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Use with caution on skin or in bath:
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Allspice (do not use on face, nipples, genitalia, or in bath)
Angelica (avoid completely if diabetic)
Anise
Basil
Bay Laurel
Bay (West Indian/Bayberry/St. Thomas)
Benzoin
Birch
Black Pepper
Cajeput
Caraway
Cedar (Texas/Virginia)
Cinnamon Leaf
Citriodora
Citronella
Clove
Cumin
Eucalyptus
Fennel
Fir
Ginger
Grapefruit
Inula Graveolens
Khella
Lemon
Lemon Verbena
Lemongrass
Lime
Litsea Cubeba
Mandarin (tangerine)
Melissa
Oak Moss
Orange
Peppermint
Peru Balsam
Pimento Berry
Pine
Spruce
Tagetes
Tea Tree
Thyme (do not use on face, nipples, genitalia, or in bath — avoid completely if high blood pressure)
Tolu Balsam
Turmeric
Turpentine
Yarrow
Ylang Ylang

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Do not use on sensitive skin, face, nipples, genitalia, or in bath:
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Allspice
Cinnamon Leaf
Clove Bud
Thyme (avoid completely if high blood pressure)

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Oils known to cause photosensitivity to UV rays include:
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Angelica Root
Bergamot (except bergapten-free)
Bitter Orange
Cumin
Dill
Ginger
Grapefruit
Lavender
Lemon
Lemon Verbena
Lime
Lovage
Mandarin (tangerine)
Orange
Verbena

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Any essential oil should be used with caution and only after doing a patch test. If you have a known existing health condition, such as epilepsy, diabetes, high blood pressure, heart, liver, or other organ issues, etc, consult your doctor and/or a reputable, experienced aromatherapist before using any essential oil.

Buy and use only 100% pure essential oils.

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The use of essential oils is not recommended for the very young or aged, or pregnant/nursing women. It is the belief of this site that essential oils should not be used internally, only externally and topically. A skin test should always be done before using an essential oil, especially important for those more sensitive or vulnerable. Consult a reputable and experienced aromatherapist for guidance. If you are under the care of a physician, it is recommended that you contact them before using essential oils.