Anything listed as an herb or supplement is not subjected to the same scrutiny as prescription drugs. Basically, they can put together anything they want and call it an herbal remedy. Some of these things can interact with each other, foods, alchohol, and prescription drugs, but because it is herbal, they dont have to test it or warn you about it. Don't get me wrong, i'm all about holistic medicine but in combination with a doctors care and prescriptions, if necessary. If you find a good doctor they will have some knowledge of reported herbs that are helpful or hurtful and their interactions with bi-polar and other medications.
Always tell your doctor what supplements you are taking, even if they don't ask. There have been some articles and books written about herbal drugs and their interactions, any healthfood store or major book store might carry or be albe to order these for you.
Good luck
mia