Is S-adenosyl methionine (SAMe) effective in treating depression?

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According to this study it is - Depression: Types of Depressive Disorders and Their Causes

In the new six-week study of 73 adults with major depression who were not responding to treatment with selective serotonin reuptake inhibitors (SSRIs), those who added oral SAM-e twice a day to their usual daily dose of SSRI showed improvements in their depression and were more likely to achieve remission, compared to their counterparts who received placebo along with their antidepressant medications.
Participants took one, 400 milligram Nature Made SAM-e Complete supplement twice daily provided free of cost by the manufacturer, Pharmavite LLC, for the first two weeks of the study. The dose of SAM-e was then increased to two 400 milligram pills twice daily for the remainder of the study. The SSRI dosing stayed constant during the study.