Why is Serotonin Important. Serotonin information gotten from a top notch source shows that serotonin is very important for the human health. Serotonin is a neurotransmitter released by the brain’s neurons and is produced from amino acid tryptophan.f there is a low production of serotonin in the brain, it can result in depression and fear. When serotonin is produced in the right quantity in the brain, it simply promotes feelings of contentment well being and comfort.