Turmeric is a spice best known for its bright yellow/orange colour. Turmeric contains curcuminoids, which are bioactive compounds. The main curcuminoid compound is curcumin. While turmeric contains between 2% and 9% curcuminoids, 75% of these active curcuminoids are curcumin. This is one of the reasons why you will hear curcumin being the "star" of turmeric.