Hi Dan,
I am quite involved in the cannabis industry and I also wondered about CDB for Bipolar. It is true what Christina said about the quality of the product. There also hasn't been enough clinical trails to verify that CBD is an effective treatment and if it is what dosage it should be taken. According to doctors I have spoken to CBD only gets activated by the Endo-Cannabinoid System when THC is involved. Research has been done to verify that THC can trigger psychosis.
I am not saying that it won't work or that it isn't good for you, I just think more regulation and information is required.
Take care.