At a glance: Ashwagandha is the root of Withania somnifera (L.) Dunal, a Solanaceae plant central to Ayurvedic medicine and widely marketed today as an “adaptogen”. Human research has focused particularly on stress, sleep and anxiety-related outcomes, but trials use different extracts and are generally small. The EMA assessed ashwagandha root but did not adopt an EU herbal monograph.[1][2]
Botanical profile
- Accepted name: Withania somnifera (L.) Dunal.
- Common names: ashwagandha, winter cherry, Indian ginseng.
- Family: Solanaceae.
- Principal medicinal part: root.
The name “Indian ginseng” reflects its modern adaptogen marketing but is botanically misleading: ashwagandha is not a Panax species.
Major constituent groups
Ashwagandha contains withanolides, withanosides and glycowithanolides, alkaloids, sitoindosides described in some extracts, and additional sterols and phenolic constituents. Root extracts vary considerably in withanolide concentration and extraction method; some commercial products also include leaf.
Traditional use
Ashwagandha has a long history in Ayurveda as a rasayana or restorative tonic. The root has traditionally been used for weakness, exhaustion, convalescence, disturbed sleep, nervous debility, poor stamina, reproductive vitality and age-related decline. It has also been used in nourishing formulas for people recovering from chronic illness or periods of prolonged physical and emotional strain.
Contemporary herbal practice
Contemporary herbalists who use adaptogens often reach for ashwagandha where depletion, poor sleep and prolonged stress coexist rather than where the person is simply seeking more stimulation. It is commonly formulated with other nervines or restorative herbs and may be taken as powder, tincture or extract. Practitioner texts also emphasise that “adaptogen” does not mean universally suitable: thyroid status, medication, digestive tolerance and the person’s overall constitution still influence the choice.
What does “adaptogen” mean here?
“Adaptogen” is a modern pharmacological concept used for substances proposed to increase resilience to stress and help maintain physiological homeostasis under physical or psychological load. Ashwagandha is one of the herbs most frequently placed in this category.
Stress and anxiety research
A 2024 systematic review and meta-analysis included nine randomised controlled trials with 558 participants. Across the pooled studies, ashwagandha formulations reduced Perceived Stress Scale and Hamilton Anxiety Scale scores and were associated with reductions in serum cortisol compared with placebo.[2]
Sleep
NCCIH concludes that some ashwagandha preparations may help with insomnia and sleep, although the evidence base is still comparatively small.[3]
Pharmacology
Research on withanolides and whole extracts has explored HPA-axis and cortisol signalling, GABAergic and other neurochemical pathways, inflammatory signalling, oxidative-stress pathways and endocrine effects.
Regulatory perspective
The EMA HMPC assessed Withania somnifera root and published a public statement rather than adopting a European Union herbal monograph.[1]
Safety
Short-term use may be tolerated by many adults, while long-term safety is less well characterised. Reported adverse effects include drowsiness and gastrointestinal symptoms. Rare cases of liver injury have been linked to supplements. Thyroid effects and medicine interactions are also relevant in susceptible people.[3]
Pregnancy and breastfeeding
NCCIH advises avoiding ashwagandha during pregnancy and breastfeeding.[3]
Student note: common evidence traps
- Do not call ashwagandha “Indian ginseng” without clarifying that it is not a Panax species.
- Record whether an extract is root-only or root-and-leaf.
- Do not compare products solely by milligrams; withanolide concentration and extraction matter.
- A stress trial is not automatically evidence for depression, chronic fatigue syndrome or athletic performance.
- The EMA did not adopt an EU herbal monograph for ashwagandha root.
References
- European Medicines Agency. Withaniae somniferae radix. Public statement.
- Arumugam V, et al. Effects of ashwagandha on stress and anxiety: systematic review and meta-analysis. Explore. 2024;20(6):103062.
- National Center for Complementary and Integrative Health. Ashwagandha: Usefulness and Safety.
Additional materia medica sources
- Mills S, Bone K. Principles and Practice of Phytotherapy: Modern Herbal Medicine. 2nd ed. Elsevier; 2013.
- Bone K. Clinical Applications of Ayurvedic and Chinese Herbs.
- Winston D, Maimes S. Adaptogens: Herbs for Strength, Stamina, and Stress Relief. 2nd ed. Healing Arts Press; 2019.
- Hoffmann D. Medical Herbalism. Healing Arts Press; 2003, for Western phytotherapeutic and formulation principles.
Last reviewed: 20 September 2026. Educational reference only; not an individual stress, thyroid or prescribing guide.
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