A composition having a curcuminoid and an essential oil of turmeric. A composition having a curcuminoid and an essential oil of turmeric, wherein the essential oil is present in an amount sufficient to cause an enhancement of bioavailability of curcumin when the composition is administered to a human as compared to bioavailability of curcumin obtained upon administration of a composition prepared without adding essential oil to the curcuminoid. A method to prepare a composition having a curcuminoid and an essential oil of turmeric.