Ashwagandha
Indian ginseng, Winter cherry · Withania somnifera
A traditional Ayurvedic adaptogen root, studied for its potential role in supporting the body’s stress response and restful sleep.
Medically reviewed by Rayna Dvorak, ND, LAc
At a glance
| What it is | Ayurvedic adaptogen root, often standardized |
| Where it’s from | Root of Withania somnifera shrub |
| Main roles | Studied for stress balance and calm |
| Common forms | Standardized extract, powder, capsule, tincture |
| Key caution | Avoid in pregnancy; thyroid caution |
| Individualized guidance | Discuss with a qualified clinician first |
What it is
Ashwagandha uses the root (sometimes leaf) of Withania somnifera, a shrub central to Ayurvedic tradition, where it is classified as a rasayana or rejuvenating tonic. Root extracts are commonly standardized to withanolides.
How it works in the body
Withanolides are the main constituents of interest. Research explores effects on the stress-response axis and cortisol signaling, but mechanisms in humans remain theoretical and incompletely understood. Proposed calming actions on nervous-system pathways are still being characterized and should be viewed as preliminary rather than established.
What it’s commonly studied or used for
Evidence varies by use. Ratings describe the strength of human research, not a promise of benefit for any individual.
| Area | What the evidence suggests | Evidence |
|---|---|---|
| Stress and tension balance | Most-studied use; standardized root extracts examined in trials | Moderate |
| Sleep quality support | Some short trials suggest improved subjective sleep | Preliminary |
| Perceived energy and vitality | Traditional rasayana tonic use; clinical data limited | Preliminary |
| Exercise and recovery support | Small studies on strength and recovery markers | Preliminary |
| General rejuvenation | Long-standing Ayurvedic tonic application | Traditional |
Available forms
| Form | General notes | Consideration |
|---|---|---|
| Standardized root extract | Often standardized to withanolides; used in most trials | Concentration and part vary widely |
| Whole root powder | Traditional form, sometimes taken with warm milk | Less consistent potency |
| Capsules or tablets | Convenient, common in commercial products | Check species and part |
| Tincture | Liquid alcohol-based extract | Contains alcohol |
Typical use & dosing context
Context only: studied ranges typically involve standardized root extracts taken daily for several weeks. Standardization to withanolides matters and products differ greatly. This is general educational context, not a personal dose; appropriate use is individualized and best guided by a qualified clinician.
Safety, side effects & who should use caution
- Avoid during pregnancy; traditionally considered capable of affecting the uterus.
- Insufficient safety data during breastfeeding; caution advised.
- May influence thyroid hormone levels; caution with thyroid conditions.
- May cause drowsiness; use care with sedating substances.
- Rare reports of digestive upset or liver concerns.
- Nightshade family; caution if sensitive.
- Natural does not mean risk-free; discuss with a clinician.
- May affect blood sugar; monitor if relevant.
“Natural” does not mean risk-free. Amounts safe for one person can be inappropriate for another.
Medication & supplement interactions
| Interacts with | Nature of the interaction |
|---|---|
| Sedatives and CNS depressants | Possible additive drowsiness or calming effects |
| Thyroid medications | May alter thyroid hormone levels and medication needs |
| Immunosuppressants | May stimulate immune activity, potentially opposing these drugs |
| Diabetes or blood-pressure medications | May add to glucose- or pressure-lowering effects |
Quality & product selection
Verify species (Withania somnifera) and plant part, since leaf and root differ. Look for standardization to withanolides, third-party testing, and screening for heavy metals and adulteration, which affect traditional imported botanicals.
Find practitioner-grade Ashwagandha in Dr. Rayna’s Fullscript dispensary →
Explore practitioner-selected options
Where appropriate, Dr. Rayna may maintain practitioner-curated products or public wellness protocols through Fullscript. Inclusion of a product does not mean it is right for you.
Unsure whether Ashwagandha fits your health history?
Supplement plans are most useful when they reflect your medications, labs, symptoms, and goals.
Common questions
It is generally avoided during pregnancy due to traditional uterine concerns and limited safety data. Discuss any use with your prenatal clinician.
Some people find it calming and it may cause drowsiness. Use caution with sedating substances and when driving.
Yes. Products differ in plant part and withanolide content, so standardized root extracts are more consistent than generic powders.
It may affect thyroid hormone levels, so those with thyroid conditions should consult a clinician before use.
Related supplements & topics
References
- Memorial Sloan Kettering — About Herbs
- NIH NCCIH
- Natural Medicines database
Educational only. This profile is general information, not medical advice, and does not create a provider–patient relationship. Do not start, stop, or change any medication or supplement based on this page without guidance from a licensed clinician. For emergencies, call 911.
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