Youtheory® Turmeric Extra Strength boldly features Curcumin C3 Complex®: the most scientifically-supported turmeric brand in the marketplace. Scientists have studied Curcumin C3 Complex® for decades to better understand its wide-ranging health benefits and the biological effects of curcuminoids inside the body. The name “C3 Complex” refers to the three primary curcuminoids found in turmeric – curcumin, demethoxycurcumin and bis-demethoxycurcumi.