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Rhodiola rosea (Golden Root, Roseroot, Aaron's Rod) is a plant in the Crassulaceae family that grows in cold regions of the world. These include much of the Arctic, the mountains of Central Asia, the Rocky Mountains, and mountainous parts of Europe, such as the Alps, Pyrenees, Carpathian Mountains, Scandinavia, Iceland, Great Britain and Ireland. The perennial plant grows in areas up to 2280 meters elevation. Several shoots grow from the same thick root. Shoots reaches 5 to 35 cm in height. Rhodiola rosea is dioecious - having separate female and male plants.
Uses of Rhodiola rosea
Rhodiola rosea may be effective for improving mood and alleviating depression. Pilot studies on human subjects showed that it improves physical and mental performance, and may reduce fatigue.
Rhodiola rosea's effects potentially are related to optimizing serotonin and dopamine levels due to monoamine oxidase inhibition and its influence on opioid peptides such as beta-endorphins,  although these specific neurochemical mechanisms have not been clearly documented with scientific studies.
In Russia and Scandinavia, Rhodiola rosea, also known as golden root, has been used for centuries to cope with the cold Siberian climate and stressful life. Such effects were provided evidence in laboratory models of stress using the nematode, C. elegans, and in rats in which Rhodiola effectively prevented stress-induced changes in appetite, physical activity, weight gain and the estrus cycle.
Phytochemicals and potential health effects
Rhodiola rosea contains a variety of compounds that may contribute to its effects, including the class of rosavins which include rosavin, rosarin, and rosin. Several studies have suggested that the most active components are likely to be rhodioloside and tyrosol, with other components being inactive when administered alone, but showing synergistic effects when a fixed combination of rhodioloside, rosavin, rosarin and rosin was used. Also, the word Rosavin is a trademarked brand name for a particular brand of Rhodiola extract from Ameriden International, Inc.
Although rosavin, rosarin, rosin and salidroside (and sometimes p-tyrosol, rhodioniside, rhodiolin and rosiridin) are among suspected active ingredients of Rhodiola rosea, these compounds are mostly polyphenols for which no physiological effect in humans is proved to prevent or reduce risk of disease.
Although these phytochemicals are typically mentioned as specific to Rhodiola extracts, there are many other constituent phenolic antioxidants, including proanthocyanidins, quercetin, gallic acid, chlorogenic acid and kaempferol.
While animal tests have suggested a variety of beneficial effects for Rhodiola rosea extracts, only for depression is there scientific evidence for Rhodiola components having anti-disease benefits in humans. A clinical trial showed significant effect for a Rhodiola extract in doses of 340–680 mg per day in 18–70-year-old male and female patients with mild-to-moderate depression. Studies on whether Rhodiola improves physical performance have been inconclusive, with some studies showing some benefit, while others show no significant difference.
Rhodiola rosea extract is mainly used in the form of capsules or a tablet, though tinctures are also available. The capsules and tablets often contain 100 mg of a standardized amount of 3 percent rosavins and 0.8–1 percent salidroside because the naturally occurring ratio of these compounds in Rhodiola rosea root is approximately 3:1. Some companies believe that there are as many as 12 active biochemical compounds in the plant and do not subscribe to what they perceive as "artificial" standardization on only two of those compounds. One company (Verde Botanica) states that 28 compounds have been identified in Rhodiola rosea, and that their proprietary extract MBS-13® is standardized to 13 of these in chromatographic assays.
A typical dosage is one or two capsules or tablets daily; one in the morning and when taking two, one in the early afternoon. Rhodiola rosea should be taken early in the day because for some it can interfere with sleep. Others can take it in the evening with no effect on sleep patterns. If a user becomes overly activated, jittery or agitated then a smaller dose with very gradual increases may be needed. It is contraindicated in excited states.
The dose may be increased to 200 mg three times a day if needed. A high dose is considered to be daily intakes of 1,000 mg and above.
In a 2007 clinical trial from Armenia, total effective doses were in the range of 340–680 mg per day for 18–70-year-old adults. No side effects were demonstrated at these doses in the treatment of mild to moderate depression,. 
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