Turmeric is the yellow spice common to Indian Cuisine and curry containing high concentrations of curcumin: http://en.wikipedia.org/wiki/Curcumin
Curcumin is a target for research due to purported anti-inflammatory, anti-tumor, anti-cancer, anti-depressant, and anti-alzheimer effects.
I recently noticed under bioavailability section that piperine (the chemical that gives black pepper its flavor) MAY increase bioavailability of curcumin by 2000%.
So having ground turmeric and black pepper on hand, I drank1/2 tsp turmeric mixed with 1/8 tsp black pepper and warm water.
A calming\focusing effect was noticed. I then repeated the same dosage to verify there was indeed minor psychoactive effects.
I would consider this combination worthy of future investigation for future nootropic\mental stacks for use as a mild antidepressant\serotogenic without any concentration impairing effects. If anyone else has experience using Turmeric\Curcumin in a health or nootropic stack, please feel free to share your thoughts.