Just did a search for cyp3a4 plus turmeric. Turned up a lot of hits:
"It appears that Curcumin from Turmeric and Piperine from Black Pepper (commonly taken together) both inhibit a number of Cytochrome P450 enzymes. P450's such as CYP3A4 and CYP2D6 are responsible for a large amount of drug metabolism and the use of Curcumin and Piperine might explain some of the reactions people are experiencing upon co-administration with drugs such as Benzodiazepines and Amphetamine type drugs... Interesting stuff and something people, especially those using this forum, should be aware of.
http://www.bluelight.ru/vb/threads/5...yme-Inhibition