2 to 5 %
||Turmeric Curcuma longa
||Wilken R, Veena MS, Wang MB, Srivatsan ES. Curcumin: A Review of Anti-Cancer Properties and Therapeutic Activity in Head & Neck Squamous Cell Carcinoma. Mol Cancer. 2011 Feb 7 10(1):12. provisional pdf p.5 3rd parapraphPubMed ID21299897
||Chattopadhyay I, Biswas K, Bandyopadhyay U, Banerjee RK: Turmeric and curcumin: Biological actions and medicinal applications. Curr Sci 2004, 87 :44-50.
||Curcumin is the principal curcuminoid and comprises
approximately 2-5% of turmeric it is responsible for the yellow color of the spice as well as the majority
of turmeric’s therapeutic effects (primary source)