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Serotonin is a neurotransmitter (brain chemical) responsible for feelings of well being and happiness. Serotonin is found in the central nervous system, where it regulates mood, appetite and sleep, and in the gut, where it regulates intestinal movements.

Symptoms of serotonin deficiency include depression, anxiety, irritability, perfectionism, low self esteem, repetitive thoughts and insomnia. Depression that's worse in Winter is due to serotonin deficiency.

Here is a <a href=http://www.gethelpfordepression.info/Tests/SerotoninTest.aspx target="_blank">Serotonin Deficiency Test</a>

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