Do omega-3 fatty improve mental health in depression mood disorder?

Probably not: Omega fish oils have an important role in health maintenance and in some therapeutic situations, mostly for refractory elevated triglycerides (a blood fat disorder). The other touted benefits are certainly less evidence based, and statistically significant objective data is lacking, but patients (and the manufacturers) may swear by them. As for me, not so much...

Maybe: There is some evidence that omega-3 oils can help in depression and anxiety. But, by themselves omega-3 oils are unlikely to be adequate. Psychotherapy would certainly help, and possibly the appropriate antidepressants might also help.

There are studies: suggest this is the case. There are lots of other herbal approaches to depression, depending on the severity of sx's. Look up SAM-e, 5 h-t-p, Rhodiola Rosea, St. Johns Wort, to start. These are substances that at least have some science behind them. If you do try out anything to lift your mood, be careful to know side effects (less with herbs) and any possible interactions with meds.