Nutritional Supplement
Rhodiola
Stress and Mood Management
Stress
Rhodiola has been shown to promote feelings of well-being and support mental function.StressThe herbs discussed here are considered members of a controversial category known as adaptogens, which are thought to increase the body's resistance to stress, and to generally enhance physical and mental functioning.2,3 Many animal studies have shown that various herbal adaptogens have protective effects against physically stressful experiences,4,5 but whether these findings are relevant to human stress experiences is debatable.Animal studies have demonstrated protective effects of rhodiola extracts against physical stresses.6,7,8 A double-blind study of healthcare workers experiencing the stress of night duty found that taking 170 mg per day of a standardized rhodiola extract prevented some of the decline in a set of mental performance measures during the first two weeks. However, when this regimen was repeated after a two-week period of not taking the extract, rhodiola did not provide protection from mental performance decline.9 In another double-blind study, 100 mg per day of the same extract was given to medical students during a stressful exam period. Those taking the extract reported a better sense of general well-being, and performed better on tests of mental and psychomotor performance.10 A third double-blind study of military cadets performing a 24-hour duty showed that 370 to 555 mg of rhodiola extract per day significantly reduced mental fatigue, as measured by several performance tasks.11 Another double-blind trial confirmed the effectiveness of rhodiola for the treatment of stress-related fatigue.12
Anxiety
Taking rhodiola has been shown to significantly improve anxiety symptoms.AnxietyIn a preliminary study, supplementation with rhodiola (Rhodiola rosea) significantly improved measures of anxiety in people suffering from generalized anxiety disorder. The amount used was 170 mg of a standardized extract taken twice a day for ten weeks.13
Brain Health
Anxiety
Taking rhodiola has been shown to significantly improve anxiety symptoms.AnxietyIn a preliminary study, supplementation with rhodiola (Rhodiola rosea) significantly improved measures of anxiety in people suffering from generalized anxiety disorder. The amount used was 170 mg of a standardized extract taken twice a day for ten weeks.14
Mental Performance
In a double-blind study, supplementing with an extract of rhodiola for two weeks significantly improved mental fatigue in a group of physicians during night duty.Mental PerformanceIn a double-blind study, supplementation with an extract of Rhodiola (1 tablet per day, providing 170 mg of extract and 4.5 mg of salidroside) for two weeks significantly improved mental fatigue in a group of physicians during night duty.15Energy Support
Fatigue
Traditional use and some double blind, test tube, and animal research suggests that rhodiola may treat fatigue.FatigueIn a double-blind study, supplementation with an extract of rhodiola (1 tablet per day, providing 170 mg of extract and 4.5 mg of salidroside) for two weeks significantly improved mental fatigue in a group of physicians during night duty.16Rhodiola has long been used in traditional medicine by Northern peoples to treat fatigue and enhance physical strength and endurance.17 Numerous animal and test tube studies show that rhodiola has both a stimulating and a sedating effect on the central nervous system, depending on intake amount.
Fitness
Athletic Performance and General Endurance
In a double-blind trial, healthy volunteers who received an extract of the herb Rhodiola rosea one hour before an endurance-exercise test saw significantly increased endurance, as measured by the time it took to become exhausted.Athletic Performance and General EnduranceIn a double-blind trial, healthy volunteers received 200 mg of an extract of Rhodiola rosea (standardized to contain 3% rosavin plus 1% salidroside) or a placebo one hour prior to an endurance-exercise test. Compared with placebo, rhodiola significantly increased endurance, as measured by the time it took to become exhausted.[REF] However, after daily use of rhodiola for four weeks, the herb no longer enhanced short-term endurance. Consequently, if rhodiola is being considered as an exercise aid, it should be used only occasionally.
Traditional Use (May Not Be Supported by Scientific Studies)
Rhodiola has long been used in traditional medicine, primarily in Russia and Scandinavia.18 The Vikings used rhodiola to enhance physical strength and endurance, and it was commonly used by many Northern peoples to treat fatigue, poor physical endurance, nervous system disorders, and infections, and to enhance fertility. Rhodiola was included in the first Swedish Pharmacopeia, and Dioscorides, the Greek physician, reported on its use in his treatise De Materia Medica. In middle Asia, rhodiola was considered a premier treatment for colds and flu during the severe winters that occur there.