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Calamus oil (sweet flag oil) is obtained by steam distillation of fresh or unpeeled, dried roots of Acorus calamus L. (Araceae). It is a yellow to medium brown, moderately viscous liquid with a pleasant, spicy, aromatic odor. Calamus oil is used in perfumery for spicy, herbaceous notes.However, its use is restricted because of the toxicity of β-asarone (see corresponding IFRA standard). In some countries (e.g., the United States, EU), the use of calamus oil is banned for application in food flavorings and in food. Due to these problems, the oil is produced just on a very small scale, for example, in India.