① Pay special attention when taking orally: basil, sage, Daphne, jasmine, etc.
② Contact dermatitis: oranges, lemons and bergamot. It will cause skin erythema, but it will disappear automatically after 2-6 hours. Generally, avoid sun exposure for 4 hours after use, and it is best to use it at night, otherwise it will easily cause photosensitive dermatitis.
(3) The skin is red and inflamed or avoid using ylang ylang, geranium, jasmine, benzoin, fennel, etc. Sensitive person.
④ Not suitable for pregnancy: basil, mahlan, myrrh, sage, Daphne, birch, clove, hyssop, etc.
⑤ Others: peppermint essential oil has powerful efficacy, strong permeability and small dosage, which is not available for children and the elderly; Rosemary can stimulate the central nervous system, and too much can cause epilepsy.