Fish oil is good for your brain, ginko biloba is good when used long term, and Bhramhi (Gotu Kola) is also good for mental alertness. Guarana is useful a a stimulant.
Herbs for mood elevation include St Johns Wort and Lemonbalm.
However you will get even more results in training your mind - try Paul Mckenna's Positivity series - has lots of great exercises (including how to get an endorphin hit on demand) and trance tracks.
Brain-gym exercises are great too, as are NLP New Code High Performance State games for general ability to cope/achievement/development of skills etc.
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