Green tea increases serotonin and dopamine or decreases them?

Green tea contains catechins (ECGC) which help to improve methylation in the body. Methylation is one of the processes by which DNA is transcribed and translated. When methylation is hypo or hyperactive it can result in an imbalance of neurotransmitters (such as dopamine and seratonin). Therefore what green tea catechins help to do is MODULATE methylation so that the proper amounts and structures of neurotransmitters are produced. So I would think that whether you have too much dopamine or too little dopamine, catechins would simply help to bring this neurotransmitter to a normal range. Look for some research being done on catechins (ECGC) and neurotransmitters on www.pubmed.com.