According to Wikipedia there are small studies that seem to show a short-term antidepressant effect, but their size and methodological quality appears to be insufficient to consider them conclusive evidence. There seems to be nothing on long-term effects.
According to Wikipedia there are small studies that seem to show a short-term antidepressant effect, but their size and methodological quality appears to be insufficient to consider them conclusive evidence. There seems to be nothing on long-term effects.