Pregnancy: Oils to avoid

Due to the effects of these oils on the reproductive organs, and the sensitivity of the foetus, they should not be used at all during pregnancy.

* Ajowan
* Angelica
* Anise star
* Aniseed
* Basil
* Bay laurel
* Calamintha
* Cedarwood (all types)
* Celery seed
* Cinnamon (leaf)
* Citronella
* Clary sage
* Clove
* Cumin
* Cypress
* Fennel (sweet)
* Hyssop
* Jasmine
* Juniper
* Labdanum
* Lovage
* Marjoram
* Myrrh
* Nutmeg
* Parsley
* Penyroyal
* Peppermint
* Rose
* Rosemary
* Snakeroot
* Sage
* Tarragon
* Thyme (red)

High blood pressure: Oils to avoid

* Black pepper
* Hyssop
* Lemon
* Lemongrass
* Nutmeg
* Rosemary
* Sage
* Thyme

Low blood pressure: Oils to avoid

* Chamomile
* Lemon
* Lavender
* Marjoram
* Ylang Ylang

Diabetes: Oils to avoid

* Angelica

Kidney problems: Oils that should be avoided

* Juniper

Homeopathic treatments: Oils to avoid

* Black pepper
* Camphor
* Eucalyptus
* Peppermint

Depression: Oils to avoid

* Basil

Epilepsy: Oils to avoid

* Fennel
* Hyssop
* Sage
* Rosemary

Oils that are phototoxic

These are oils which can cause the skin to darken (in patches, not in a tan) if exposed to direct sunlight.

* Angelica root
* Bergamot
* Cumin
* Ginger
* Lemon
* Lime
* Loveage
* Mandrain
* Orange
* Verbena

Sensitive skin: Oils to avoid

These oils may cause eczema or dermatitis with people who have sensitive skin.

* Aniseed
* Basil
* Bay
* Benzion
* Bergamot
* Cade
* Cajut
* Cananga
* Cedarwood
* Chamomile
* Citronella
* Garlic
* Geranium
* Ginger
* Hops
* Jasmine
* Lemon
* Lemongrass
* Loveage
* Mastic
* Melissa
* Mint
* Orange
* Pine
* Styrax
* Tea Tree
* Thyme
* Valerian
* Vanilla
* Violet
* Yarrow
* Ylang Ylang