Rhodiola History: Northern Mountains to Fatigue Trials
Rhodiola rosea grows at high altitudes and northern latitudes, and its adaptogen label rests on a few fatigue trials and a contradictory systematic review. The strongest trial used one standardized extract. Check the extract and the outcome before you read a rhodiola label as a fatigue result.
The history of rhodiola starts on high, cold ground. Ishaque and colleagues describe Rhodiola rosea as grown at high altitudes and northern latitudes, and note that its purported adaptogenic properties led to studies of performance and fatigue ([Ishaque et al., 2012](https://doi.org/10.1186/1472-6882-12-70)). The surprise is how little of that fatigue record agrees. The same systematic review found that every one of the 11 studies it included had a high risk of bias or reporting flaws, and it called the research contradictory. This post follows the plant from its traditional and adaptogen labels to the trials, and it separates the strong-sounding reviews from the trial data. ## Traditional use and the adaptogen label Panossian and colleagues review the plant's traditional and official use, and they report roughly 140 compounds isolated from its roots and rhizome ([Panossian et al., 2010](https://doi.org/10.1016/j.phymed.2010.02.002)). The adaptogen label has a working definition in a 2009 review, which describes adaptogens as herbal preparations that increase tolerance to mental exhaustion and improve attention and mental endurance when performance is lower. That definition rests on clinical efficacy, not on a single origin story ([Panossian and Wikman, 2009](https://doi.org/10.2174/157488409789375311)). The sources I checked do not say who coined the word or when, so this post names no one. ## What the trials measured The best-known placebo-controlled trial tested SHR-5, a standardized root extract, at 576 mg a day for 28 days. It enrolled 60 adults aged 20 to 55 with stress-related fatigue. Both groups improved, which the authors attribute to a placebo effect. Between groups, the extract did better on the Pines burnout scale and on several attention measures, and cortisol response to awakening differed ([Olsson et al., 2009](https://doi.org/10.1055/s-0028-1088346)). Performance claims have their own story, which the [creatine history](/blog/history/history-of-creatine-from-meat-extract-to-sports-shelf) covers from a different angle. Ishaque and colleagues found 11 eligible trials of Rhodiola rosea for physical and mental fatigue. Two of six trials in healthy people reported an effect on physical fatigue, and three of five trials reported one on mental fatigue. They judged the overall results contradictory ([Ishaque et al., 2012](https://doi.org/10.1186/1472-6882-12-70)). The two positions can both be true. The 2009 review calls the evidence for SHR-5 strong for attention and mental performance in fatigue, and its strong label applies to that extract. The 2012 systematic review counts the wider fatigue record, which is contradictory. For this post, the SHR-5 result is preliminary, and the wider fatigue evidence is contradictory. The [ashwagandha monograph](/ingredients/ashwagandha-withania-somnifera) shows how another herb's stress research is built, and the [sleep and stress guide](/health/sleep-stress-complete-guide) sets out the outcomes that trials in this area measure. ## Which compounds the labels mean Rhodiola extracts contain many compounds, and two of them come up most often. Klaskova and colleagues call salidroside an active component of Rhodiola rosea in a 2026 study ([Klaskova et al., 2026](https://doi.org/10.1007/s43440-026-00842-w)). Brink and colleagues found that rosavin reduced hydrogen peroxide levels in vitro, and that its intact structure was needed for that effect ([Brink et al., 2026](https://doi.org/10.3390/life16091510)). Those are cell and laboratory findings, not trial outcomes. A label that lists rosavins or salidroside tells you which marker the maker chose, not what the product does in people. ## Interactions: what the in vitro data show Loretz and colleagues tested 29 herbal supplements for CYP3A inhibition in human intestinal tissue. Rhodiola fell in the group below 50% inhibition. Green tea extract, St. John's wort, valerian root and horehound were above 80% ([Loretz et al., 2020](https://doi.org/10.1124/dmd.120.000033)). Klaskova and colleagues found that salidroside did not directly inhibit rat or human P450 enzymes in vitro, and they judged the drug-herb risk unlikely to be significant in their preclinical work ([Klaskova et al., 2026](https://doi.org/10.1007/s43440-026-00842-w)). These are lab results. The sources I checked do not include a clinical interaction study for rhodiola. ## Bottom line Check the trial and the extract before you assume a fatigue or stress result. The best-supported trial used one standardized extract at one dose for 28 days, and the wider fatigue record is contradictory. If you take prescription medicines, talk to a clinician before you add a rhodiola product, because the lab data are not a clinical interaction study. ## Frequently asked questions **Which regions and communities used rhodiola traditionally?** The sources I checked do not name specific communities or regions for traditional use. Ishaque and colleagues describe the plant as grown at high altitudes and northern latitudes ([Ishaque et al., 2012](https://doi.org/10.1186/1472-6882-12-70)). **How did the Siberian research of the mid-20th century shape its story?** The sources I checked do not cover mid-20th-century research, so this post does not describe it. The modern anchor is the 2009 definition of adaptogens, which rests on clinical efficacy ([Panossian and Wikman, 2009](https://doi.org/10.2174/157488409789375311)). **What are rosavins and salidroside, and why do they matter?** They are two compounds named most often in the rhodiola literature. Klaskova and colleagues call salidroside an active component ([Klaskova et al., 2026](https://doi.org/10.1007/s43440-026-00842-w)), and Brink and colleagues show rosavin's antioxidant effect in vitro ([Brink et al., 2026](https://doi.org/10.3390/life16091510)). No trial in this post measured them as a dose-response outcome. **What did the early fatigue trials measure?** Olsson and colleagues measured burnout on the Pines scale, attention scores, mental health and cortisol response over 28 days ([Olsson et al., 2009](https://doi.org/10.1055/s-0028-1088346)). Ishaque and colleagues grouped trials of physical and mental fatigue ([Ishaque et al., 2012](https://doi.org/10.1186/1472-6882-12-70)). **Why do rhodiola extracts vary so much in the research?** The studies use different extracts, doses and fatigue measures. The 2012 review found that the studies it included had a high risk of bias or reporting flaws ([Ishaque et al., 2012](https://doi.org/10.1186/1472-6882-12-70)), and the strong label in the 2009 review applies to SHR-5 specifically ([Panossian and Wikman, 2009](https://doi.org/10.2174/157488409789375311)). **Which medicines might interact with rhodiola?** The in vitro work does not flag rhodiola as a strong CYP3A inhibitor ([Loretz et al., 2020](https://doi.org/10.1124/dmd.120.000033)), and the salidroside work finds no direct P450 inhibition in its tests ([Klaskova et al., 2026](https://doi.org/10.1007/s43440-026-00842-w)). Neither is a clinical interaction study, so talk to a clinician if you take prescription medicines. **How does rhodiola compare with ashwagandha in the literature?** This post does not compare them head to head. The [ashwagandha monograph](/ingredients/ashwagandha-withania-somnifera) covers that herb's stress and sleep research, and the [sleep and stress guide](/health/sleep-stress-complete-guide) sets out the outcomes both herbs are tested on. ## Next reads - [Sleep and stress: the complete guide](/health/sleep-stress-complete-guide): the reference page for stress, sleep and fatigue outcomes in herbal trials. - [Ashwagandha: the monograph](/ingredients/ashwagandha-withania-somnifera): the other herb in this stress conversation, with its own trial record. ### Related reading - [The history of holy basil, the next adaptogen in this series](/blog/history/history-of-holy-basil-from-hindu-temples-to-adaptogen) - [The history of maca, the next plant in this series](/blog/history/history-of-maca-from-andes-to-powder)