just look into the individual ingredients and their possible problems or benefits...
http://www.viable-herbal.com/herbology/herbs25.htm
though that just shows human interractions
Clove (Eugenia Caryophyllata) - An antiseptic and stimulating oil useful in mouthwash and gargle. Comforting rubbed onto gums, traditionally used to relieve toothache. Could be an effective mosquito repellent. Warning: Clove is a powerful skin irritant and should be used carefully. Do not use during pregnancy.
Lemon (Citrus Limonum) - Widely used in beauty care. It cleanses, refreshes, cools and stimulates. Astringent and antiseptic oil. Useful for oily skin. Can be used to lighten dull, stained hands or to tone and condition nails and cuticles. Blends well with other oils. Warning: Do not use lemon on the skin in direct sunlight. Dilute to 1% and use only 3 drops in a bath as it may cause irritation of the skin
Thyme (Thymus Vulgaris) - Long known since ancient times as a medicinal and culinary herb. Vaporize as a household disinfectant. It has a strong pungent aroma and is said that it can ward off rodents and get rid of fleas. Warning: Do not use Thyme when pregnant or having high blood pressure. Dilute to no more than 2% Thyme before use. It may cause irritation to sensitive skins.