Piperine (black pepper extract) is reported to enhance absorption of turmeric (curcumin), which is a root herb related to ginger, and different herb from cumin.
I’ve seen comments on the ‘net that this particular combination (turmeric and black pepper) helps clear up psoriasis, and my elbows do look a bit clearer, even though I’ve only been on it two weeks. I figured it was worth a try.