Acupuncture for depression is very effective through treating the liver hence allowing the blocked energy to flow from the inside to the outside hence refreshing the heart and creating joy.
You can read more about the benefits of acupuncture for depression here.
Depression. The Chinese differentiate depression clearly from sadness or unhappiness. It has got an intensity within it and power if it can only be turned outward not inward. The analogy of an acorn longing to grow upwards and suddenly a block of concrete is placed on top of the soil to stop it growing. A lot of frustration and hopelessness come up and if these aren't expressed there is depression it is almost like the life force that should be expressed and make us happy is restrained. Depression follows. That's why the Chinese associate depression with the liver energy that allows us to express clearly our feelings to the world, feel hopeful, bright and allows the smooth flow of the emotions.
Some of you might be surprised that the liver have all these emotional and mental functions but if you take a look at an alcoholic who drinks and damages his liver exactly the opposite of the above qualities happen. They get frustrated angry unable to relate or express themselves or feel there is any future or hope.