But it won’t do much good unless used alongside black pepper, which significantly increases thebioavailability of curcumin, the dominant compound in turmeric. That’s why, in supplement form, curcumin and turmeric are both prepared with black pepper extract or piperine, a compound of pepper, according to Dr. Andrew Weil.
(via Food Synergy: 8 Healthy Food Pairings That Are Even Better Together)