Rhodiola rosea, also called roseroot, is an adaptogenic herb from the Crassulaceae family of plants. This adaptogenic property derives from the presence of phytochemicals called rosavins within the plant tissue. Rosavins are a group of cinnamyl alcohol glycosides that are likely responsible for the stress reducing properties of the herb. A large number of randomised controlled trials have been performed on humans to ascertain the mood enhancing effects of Rhodiola. In a systematic review of the literature, one group of researchers analysed 39 clinical studies that investigated the effects of Rhodiola on humans. The results of their review suggested that Rhodiola rosea was significantly effective at attenuating the symptoms of mild to moderate depression and the symptoms of mild anxiety. There was evidence that Rhodiola rosea was significantly able to elevate the mood of the subjects. Therefore to date, the overwhelming scientific consensus is that Rhodiola rosea is a mood elevating herb.
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