Cumin

http://www.drugs.com/npc/cumin.html

Pros: 
antioxidant, reduces blood glucose levels in diabetics, shown to have anticancer effects in some studies, animal studies show it could stimulate bile acid secretion and pancreatic enzymes
Cons: 
Did paleolithic people use spices? Who knows, but either way they are outside efficient foraging theory because of medicinal and flavor value. Regardless, the evidence is that cumin is harmless.