Cautions for specific populations:
During times of pregnancy, essential oils that are safe for use should be used in half of the strength as usual. Oils which have emmenagogue properties should be avoided and are contraindicated including: angelica, star anise, aniseed, basil, bay laurel, cedarwood (all types), cinnamon leaf, citronella, clary sage, clove, cumin, sweet fennel, hyssop, juniper, lovage, marjoram, myrrh, nutmeg, and white thyme. It is also suggested to avoid using the essential oils of rosemary, rose, and peppermint during the first four months of pregnancy.
People who have Epilepsy should avoid all use of the essential oils of Fennel, Sage, Tansy, Hyssop, Wormwood, and Rosemary.
In cases of High Blood Pressure avoid Hyssop, Rosemary, Sage (Spanish and common), and thyme.
In all cases of Diabetes avoid use of Angelica.
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