Indian calamus oil, also known as sweet flag or Acorus calamus, is an essential oil extracted from the root of the Indian calamus plant. It has a warm, woody, and spicy aroma. It is known for its calming and grounding properties, and has been traditionally used to help with anxiety, stress, and insomnia. Indian calamus oil is also believed to have antimicrobial properties, which may make it useful for treating certain skin conditions. It is also used to stimulate appetite and digestion. Indian calamus oil is typically used in aromatherapy, massage, and traditional medicine. It is considered safe for most people when used topically in small amounts, but it's always best to do a patch test before using it and to consult with a healthcare professional before using it internally as large doses can cause hallucinations, nausea, and other adverse effects.