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Herbs are wonderful things given by our Mother Earth, but certain cautions MUST be observed! White Willow is used as a "substitute" for aspirin, but CANNOT be used by folks allergic to aspirin, since it is the SAME substance! Likewise, Chamomile is in the Ragweed family ... if you have a ragweed allergy, avoid chamomile! Other herbs used in magick, such as Belladonna and Wolfbane, are poisonous and should only be used with extreme cauton. Clove and cinnamon essential oils are irritants - many oils cannot be used "straight" for the same reason.
Do not assume "just because my herb book says so" that your source is correct or that the absence of warning labels means that a product is safe for consumption or use on the body. Please, investigate any herb/oil thoroughly before use.