Comparisons
Ashwagandha or Rhodiola?
Ashwagandha (Withania somnifera) and rhodiola (Rhodiola rosea) are common in stress and fatigue supplements. Their evidence and safety warnings differ. The table is built from the sourced cards of both herbs.
| Aspect | AshwagandhaWithania somnifera (L.) Dunal | RhodiolaRhodiola rosea |
|---|---|---|
| Strongest evidence | B Limited clinical evidence | T Traditional use |
| Needs | Sleep, Stress & Mood, Men’s Health | Energy & Focus |
| Form | Clay, Soap & Other | Dried Herb & Tea |
| How to use | Clinical studies administered particular root extracts orally as capsules or tablets. Extracts vary in standardization, so study doses are not interchangeable across products and no universally safe daily dose has been established. | Adults use a ready-made dry extract product as labelled (144–200 mg per dose). |
| Pregnancy | Avoid | Avoid |
| Breastfeeding | Avoid | Avoid |
| Recommended minimum age | Not stated | From age 18 |
| Drug interactions | Interactions reported | No recorded interactions |
| Duration limit | Not stated | See a doctor if no better after 2 weeks |
Which one, when?
Ashwagandha
Some standardised root extracts have been linked to small improvements in perceived stress and sleep measures with short-term use; results cannot be generalised across products. Not for people with liver, thyroid or autoimmune disease.
Full card →Rhodiola
Traditionally used as a dry extract for stress symptoms such as fatigue and exhaustion; a review reported inconsistent results and low study quality. See a doctor if there is no improvement within 2 weeks.
Full card →Good to know
- Rare cases of serious liver injury have been reported with ashwagandha; stop it if jaundice, dark urine or marked weakness occurs.
- Ashwagandha may interact with thyroid hormones, sedatives and medicines for diabetes, blood pressure or immunosuppression.
- Neither is recommended during pregnancy or breastfeeding; rhodiola is not recommended under 18, ashwagandha not for children.
Sources
- European Union herbal monograph on Rhodiola rosea L., rhizoma et radix – Revision 1EMA HMPC · 2024 · MonographSource accessed:
- Rhodiola rosea for physical and mental fatigue: a systematic reviewBMC Complementary and Alternative Medicine · 2012 · Systematic reviewSource accessed:
- Ashwagandha: Usefulness and SafetyNIH National Center for Complementary and Integrative Health · 2023 · Official agency informationSource accessed:
- Ashwagandha: Is it helpful for stress, anxiety, or sleep? — Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements · 2025 · Official agency informationSource accessed:
- Ashwagandha: food supplements with potential health risks (Communication 39/2024)German Federal Institute for Risk Assessment (BfR) · 2024 · Official agency informationSource accessed:
- Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysisPLOS ONE · 2021 · Systematic reviewSource accessed:
- Effects of ashwagandha (Withania somnifera) on mental health in adults: A systematic review and dose-response meta-analysis of randomized controlled trialsComplementary Therapies in Medicine · 2026 · Systematic reviewSource accessed:
- Dual impact of Ashwagandha: Significant cortisol reduction but no effects on perceived stress - A systematic review and meta-analysisNutrition and Health · 2025 · Systematic reviewSource accessed:
- Withania — Drugs and Lactation Database (LactMed®)NIH National Library of Medicine / NCBI Bookshelf · 2024 · Official agency informationSource accessed:
- Withania somnifera (Ashwagandha) and very rare risk of liver injuryAustralian Therapeutic Goods Administration · 2026 · Official agency informationSource accessed: