Hi kat,
i'm not sure if you're the same kat that is on a couple of bipolar forum's that i'm on or not (i go as cin on them), but anyway, to your questions. I have heard of serenity, and some people swear by it, and think that it works wonderfully. I have never used it, so I can't say how well it works. But, fish oil is another natural mood stabilizer, but I don't think it would be very effective for severe mania or depression. But, it is helpful in stabilizing minor mood disturbances. However, I use it as an adjunct to my medicine regime, and it has been very helpful. Right now, i'm taking five 1,000 mg. Gel caps per day. When the weather starts getting nicer, I will reduce it back to two or three per day, as I mainly have trouble with depression (i'm bipolar, too) but don't get the manias at all, and only hypomania a couple times a year or so. Yup, the b vitamins seem to help too, as I do take a b vitamin complex capsule daily as well. I noticed a pick up in energy, and more of a general well-being after I started taking them. I take ginsing as well, but that is for my low energy drive too. I don't know if it helps to bring energy into balance, or just gives more energy though. I think calcium is another important mineral we need to keep balanced, whether or not it's for bipolar.
Hope this helps some, and like everything, check with your Dr. Before starting any herbal meds, and of course, what works for one person, may not work as well for another, or it might just be the lifesaver they need
take care,
cin