Rhodiola rosea (golden root): possible side effects – what you need to know
Leila WehrhahnUpdated:The essentials at a glance:
Rhodiola rosea (roseroot) may be associated with mild side effects such as headaches, gastrointestinal discomfort, restlessness or sleep disturbances; more rarely, skin rash or palpitations have been reported. There may be an increased risk when used together with serotonergic antidepressants (serotonin syndrome), and episodes of mania have been described in people with a tendency to bipolar disorder. It is generally advised to avoid use during pregnancy, breastfeeding and in individuals under 18 years of age. The EMA refers to daily amounts in the range of 144–400 mg, usually taken in the morning, with a review of tolerability after 1–2 weeks. Products from reliable, quality‑controlled sources are recommended, and suspected adverse reactions should be reported to the relevant national medicines authority.
Rhodiola rosea – often called golden root or rosary root – is popular among health-conscious adults, biohackers and longevity enthusiasts. Many people hope it might support stress resilience, energy and focus. But “natural” does not automatically mean “risk‑free”.
This article explains what is known about Rhodiola side effects, how often they seem to occur, who should be cautious or avoid it, and how to use it as safely as possible. It is based mainly on European Medicines Agency (EMA) guidance and clinical evidence.
Important: The European Medicines Agency (EMA/HMPC) classifies Rhodiola as a traditional herbal medicinal product for adults. It is recognised only for short‑term relief of stress‑related symptoms, and you should seek medical advice if symptoms last longer than two weeks. See the EMA overview page on Rhodiola.
What is Rhodiola rosea and how is it used?
Rhodiola rosea is an alpine and Arctic plant. Its rhizome and roots have traditionally been used as an “adaptogen” – a plant substance thought to help the body cope with stress.
Key constituents include:
- Rosavins (such as rosavin)
- Salidroside
Research is still ongoing to clarify exactly how these compounds work in humans.
Regulatory status in the EU and UK
Within the EU, Rhodiola is covered by the EMA’s Committee on Herbal Medicinal Products (HMPC). The updated EMA monograph (Revision 1, adopted 20 March 2024) states:
- Recognised as a traditional herbal medicinal product for adults
- Use is for the temporary relief of stress‑related symptoms (such as fatigue and weakness)
- Not recommended for adolescents or children
- If symptoms persist for more than two weeks, you should seek medical advice
Rhodiola rosea capsules
Golden root is a traditionally used adaptogen. In the EU, short‑term adult use for stress‑related symptoms is recognised. Follow the EMA’s guidance and speak to a doctor if symptoms last longer than two weeks.
How Rhodiola side effects can arise (in simple terms)
Rhodiola often feels subtly stimulating for some people. This varies a lot between individuals and can depend on:
- Overall dose
- Time of day (morning vs late afternoon/evening)
- Other stimulants taken at the same time (for example, caffeine, other “energy” supplements)
Why this matters
- Higher doses or taking Rhodiola late in the day may increase the risk of restlessness or difficulty falling or staying asleep.
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Product quality also plays a role. Not all products:
- Use the same plant species
- Contain comparable amounts of rosavins and salidroside
- Studies have found cases of misidentification or adulteration with other Rhodiola species (such as R. crenulata), which can affect both effects and tolerability. Analysis of authenticity and quality of Rhodiola products.
High or late doses, stacking with stimulants, and low‑quality or inconsistent products can all make side effects more likely. Quality and dosing make a big difference.
Common Rhodiola side effects adults may notice
The following side effects have been reported with Rhodiola. They are usually mild and temporary, and in many clinical trials they occur at similar rates to placebo:
- Headache
- Digestive upset (such as nausea, abdominal pain, diarrhoea)
- Occasional dizziness
- Dry mouth or, less often, increased salivation
- Sleep disturbance or inner restlessness (especially with late dosing or alongside caffeinated drinks)
These unwanted effects are listed in the EMA monograph (frequency not known). Larger reviews and randomised trials generally describe few and mostly mild side effects, often with no clear difference compared with placebo. Systematic review on efficacy and safety.
Mini case vignettes
- “Mild, dull headache”: Martin (42) started with 200 mg in the morning. After two days he noticed a mild, dull headache. Approach: reduced to 144 mg and made sure he was well hydrated – the discomfort resolved.
- “Restless sleep”: Sabine (37) took a second dose at 5 pm. Result: difficulty falling asleep and lighter sleep. Approach: switched to a single morning dose and cut back on afternoon coffee – sleep quality returned to normal.
Less common but reported Rhodiola side effects
Less frequent side effects described in reports and reviews include:
- Skin reactions such as rash or itching – mentioned in the EMA monograph. Details in the monograph.
- Circulatory symptoms such as palpitations – reported occasionally, sometimes no more often than with placebo. Clinical overviews describe palpitations as an unusual adverse effect. MSD Manual: Rhodiola.
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Blood pressure changes: some animal data suggest a possible blood pressure‑lowering effect; how relevant this is in humans is unclear. It may be sensible to use caution if you:
- Are prone to low blood pressure
- Take medicines for high blood pressure
Rare but serious Rhodiola side effects: what to look out for
Serious side effects appear to be rare, but a few important risks are worth knowing.
Serotonergic risk (serotonin syndrome)
In isolated case reports, combining Rhodiola with serotonergic antidepressants (for example SSRI, SNRI, MAOI) has been associated with symptoms compatible with serotonin syndrome, such as:
- Marked agitation or restlessness
- Tremor or shaking
- Muscle stiffness or clonus (muscle jerks)
- Fever or feeling unusually hot and sweaty
One case report describes problems after adding Rhodiola to paroxetine. If these warning signs appear, urgent medical assessment is advisable. Case report: paroxetine + Rhodiola.
Mania or hypomania
In a person with bipolar vulnerability, a case of mania has been reported in temporal association with Rhodiola use. Because of this, Rhodiola should only be considered in people with bipolar disorder or a history of mania/hypomania under the close supervision of their psychiatrist. Case report: mania associated with Rhodiola rosea.
Do not combine Rhodiola and serotonergic antidepressants on your own initiative. If you experience restlessness, shaking, sweating or fever, confusion, or a markedly altered or “high” mood, seek medical advice promptly.
Rhodiola interactions with medicines and supplements
Because Rhodiola can affect neurotransmitters and possibly liver enzymes, it may interact with certain medicines and other supplements. If you take regular medication, it is sensible to check with your GP, pharmacist or prescribing clinician before starting.
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Antidepressants with serotonergic effects
Includes SSRI, SNRI, MAOI, and tricyclics with serotonin effects, plus some other serotonergic drugs such as linezolid, tramadol and triptans.- Case reports and theoretical concerns suggest a risk of serotonin syndrome.
- Combinations without medical supervision are generally discouraged.
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Liver enzymes (CYP metabolism)
One human study found a Rhodiola product moderately inhibited CYP2C9 (important for medicines like warfarin and phenytoin). In vitro (test‑tube) studies also showed inhibition of CYP3A4, 2D6 and 1A2, and effects on P‑gp transporters.- The clinical relevance is still unclear and likely product‑specific.
- Caution is sensible if you take medicines with a narrow therapeutic range that depend on these enzymes.
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Blood sugar and blood pressure medicines
Preclinical data and overviews suggest Rhodiola may have:- Mild blood sugar‑lowering effects
- Possible blood pressure‑lowering effects
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Anticoagulants with a narrow therapeutic range
For medicines like warfarin that depend on CYP2C9, potential interaction means careful monitoring of clotting parameters (for example, INR) is recommended when starting or stopping Rhodiola. CYP2C9 human study. -
Stimulants and caffeine
Combining Rhodiola with caffeine or other stimulating supplements may increase:- Inner restlessness
- Jitteriness
- Sleep problems
The EMA monograph notes that no clinically relevant interactions have been firmly established so far, but it also recognises that available data are limited. Individual case reports and laboratory studies support a cautious, personalised approach. EMA monograph (interaction section).
If you take regular medication, always discuss Rhodiola with your doctor or pharmacist first – especially if you use antidepressants, blood thinners, blood pressure or blood sugar medicines.
Who should avoid Rhodiola – and who needs medical supervision?
Rhodiola is not suitable for everyone. In some situations, avoiding it altogether is recommended; in others, careful medical supervision is required.
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People who should avoid Rhodiola
- Pregnancy and breast‑feeding – there is insufficient safety data. EMA monograph.
- Children and adolescents under 18 years – EMA does not recommend use in this age group.
- Known allergy or hypersensitivity to Rhodiola or related plants.
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People who should only use Rhodiola with medical supervision
- Bipolar disorder or tendency to mania/hypomania – due to a reported case of mania. Mania case report.
- Depression being actively treated – particularly with serotonergic antidepressants; potential interactions need individual assessment.
- Untreated high blood pressure or symptomatic low blood pressure.
- Diabetes treated with medication – possible additive blood sugar‑lowering effect.
- Polypharmacy (taking several long‑term medicines) – higher chance of clinically relevant interactions. MSD Manual.
Rhodiola dosing strategies to minimise side effects
If, after discussing it with a healthcare professional where appropriate, you decide to try Rhodiola, a conservative dosing strategy can help reduce the risk of side effects.
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“Start low, go slow”
Begin at the lower end of the EMA single‑dose range, for example:- 144–200 mg once daily (standardised extract)
- If well tolerated and still needed, this can be increased to 1–2 times per day
- Total daily dose should generally stay within 144–400 mg
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Time of day
Take Rhodiola:- In the morning, and if a second dose is used, around midday
- Avoid taking it in the late afternoon or evening – this can cut the risk of insomnia or restless sleep
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Trial period
Use Rhodiola as a time‑limited trial:- 1–2 weeks is often suggested as an initial period
- If your symptoms persist for more than two weeks, the EMA advises seeking medical advice rather than simply continuing or increasing the dose
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Avoid “stacking” early on
At the beginning:- Do not combine Rhodiola with other stimulating supplements (such as strong nootropic blends or high‑dose caffeine pills)
- Consider reducing caffeine, especially later in the day
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If you feel restless or sleep worsens
If you notice:- Inner restlessness
- Jitteriness
- Difficulty falling or staying asleep
- Lowering the dose
- Restricting use to morning only
- Taking a break and reassessing with a healthcare professional
With Rhodiola, less is often more at the start: begin with a low dose, take it early in the day, look out for interactions – and reassess after 1–2 weeks.
Rhodiola product quality: what to look for
Rhodiola supplements can vary widely in quality and composition. Choosing a reliable product can improve both predictability of effect and safety.
Checklist: what to look for on the label
- Botanical name: clearly listed as Rhodiola rosea L.
- Plant part used: rhizome/root (the parts used in traditional preparations and EMA‑recognised products)
- Extraction ratio and solvent: for example, 3:1 or 5:1, plus the solvent used (e.g. ethanol/water)
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Standardisation: declared content of key marker compounds, e.g. percentages of:
- Rosavins
- Salidroside
- Manufacturing quality: evidence of GMP (Good Manufacturing Practice), batch number, and ideally access to a certificate of analysis (CoA) showing independent testing
Why this matters
Investigations of Rhodiola products on the market have found:
- Large differences in the declared vs actual content of active constituents
- Cases of mislabelling or substitution with other Rhodiola species (such as R. crenulata)
These issues can alter both effectiveness and the side‑effect profile. Study on authenticity and adulteration.
A curated selection of longevity‑focused products can be found in our longevity collection.
Standardised, independently tested Rhodiola products are more likely to have predictable effects and tolerability than unverified supplements.
When to stop Rhodiola and seek medical help
Listening to your body – and acting early if something feels off – is key to using any supplement safely.
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Stop immediately and seek urgent medical help if you notice:
- Symptoms suggestive of serotonin syndrome (especially if you take antidepressants): marked agitation, shaking, muscle jerks (clonus), high fever, confusion, or very heavy sweating
- Severe anxiety or panic that is out of character for you
- Palpitations with chest pain, shortness of breath, or feeling faint
- Signs of an allergic reaction: hives, rash, swelling of the lips, face or throat, or difficulty breathing
- New manic or hypomanic symptoms: unusually elevated or irritable mood, racing thoughts, needing much less sleep, very impulsive behaviour
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Pause Rhodiola and discuss with a doctor or pharmacist if you experience:
- Persistent insomnia or restless sleep despite adjusting the dose or timing
- Headache that does not improve with dose reduction and adequate hydration
- Digestive issues (nausea, diarrhoea, abdominal pain) lasting several days
- Notable changes in blood pressure or blood glucose, especially if you already monitor these or are on relevant medication
How to report Rhodiola side effects in the UK
If you suspect a side effect from any herbal product or supplement, it is helpful – both for your own care and for public safety – to report it.
In the UK, suspected adverse reactions to medicines and certain herbal products can be reported via the MHRA Yellow Card scheme:
Before reporting, it can help to note:
- The exact product name and brand
- Batch number (if available)
- Daily dose and how long you have been taking it
- Any other medicines or supplements you use
- When the side effect started, and how it has changed over time
You can also ask a GP, pharmacist, or other healthcare professional to submit a Yellow Card report on your behalf.
Rhodiola side effects: frequently asked questions (FAQ)
Does Rhodiola keep you awake?
Many people describe Rhodiola as gently stimulating. For that reason, morning use is often preferred.
If you notice that your sleep is worse after starting Rhodiola:
- Reduce the dose
- Take it only in the morning
- Consider pausing and reassessing
You can find more on possible effects related to focus, memory and learning in our article: Rhodiola (golden root): focus, memory, learning.
How long should I take Rhodiola for?
The EMA framework assumes short‑term use. A trial of 1–2 weeks is commonly suggested to see how you respond.
- If your stress‑related symptoms persist beyond two weeks, seek medical advice rather than simply continuing.
- For any longer‑term use, your existing health conditions and other medicines should be taken into account. EMA note on the two‑week guidance.
Can I combine Rhodiola with antidepressants?
Without medical advice, this is not recommended.
- Combining Rhodiola with SSRI, SNRI or MAOI antidepressants can increase the risk of serotonin syndrome.
- Even though serious events appear rare, the potential severity of serotonin syndrome means combinations should only be considered under the guidance of a prescriber who knows your full medication list.
Case report: paroxetine + Rhodiola.
Is golden root safe for athletes?
For most recreational exercisers, the main considerations are the usual side effects and interactions, plus product quality.
For competitive athletes:
- Always check the latest UK Anti‑Doping (UKAD) and WADA lists.
- Choose products that provide batch testing or a CoA to reduce the risk of contamination with prohibited substances.
At present, concerns are more about supplement quality and contamination than about Rhodiola itself being specifically targeted by anti‑doping rules.
What Rhodiola dose is considered cautious?
Staying within the EMA‑recognised range is a practical starting point for adults:
- Single dose: 144–200 mg of standardised extract
- Total daily dose: 144–400 mg
If you know you are sensitive to stimulants or new supplements, start at the lowest end of the range and increase slowly only if needed and well tolerated. EMA monograph.
Quick check: is Rhodiola a good fit for you?
Before adding Rhodiola to your supplement routine, consider the following questions:
- Do you take antidepressants or other serotonergic medicines?
- Are you on blood pressure, blood sugar, anticoagulant or anti‑epileptic treatment?
- Do you live with cardiovascular, metabolic or mental health conditions (such as bipolar disorder or recurrent depression)?
- Are you pregnant, breast‑feeding, or under 18?
If you answer “yes” to any of these, speak to your GP, psychiatrist or pharmacist before starting Rhodiola. If you decide to try it:
- Start with a low morning dose
- Avoid “stacking” it with other stimulants initially
- Monitor how you feel over the first 1–2 weeks
- Stop and seek help promptly if concerning symptoms arise
If you suspect an adverse reaction to a medicine or herbal product, you can report it through the official MHRA Yellow Card portal at yellowcard.mhra.gov.uk.
This article is for information and education only and does not replace personalised medical advice, diagnosis or treatment.