Ashwagandha
What Is Ashwagandha?
Ashwagandha (Withania somnifera) is a small shrub native to India, used in Ayurvedic medicine for thousands of years as a "rasayana" — a category of herbs traditionally believed to support vitality and resilience. In Sanskrit, ashwagandha roughly translates to "smell of horse", a reference to the root's distinct smell and the traditional belief that it could lend the strength of a horse to whoever took it. Today, it's one of the most researched herbs in Ayurveda, with modern clinical trials examining its effects on stress, sleep, thyroid function and physical performance.
If you've searched "what is ashwagandha" because you've seen it in a supplement aisle or on a wellness Instagram page, here's the short version: it's an adaptogen, a category of plants thought to help the body respond to physical and mental stress more efficiently. The active compounds responsible for most of its studied effects are a group of steroidal lactones called withanolides, concentrated mainly in the root.
How Does Ashwagandha Work in the Body?
Most of what we know about how ashwagandha works comes from its effect on the hypothalamic-pituitary-adrenal (HPA) axis, the system that governs your body's stress response and cortisol release. When you're under chronic stress — whether that's a demanding job, broken sleep from a toddler, or the general load of running a household in a metro city — your HPA axis can stay switched on for longer than it should, keeping cortisol elevated.
Research suggests ashwagandha root extract may help modulate this stress response rather than simply sedate it. A 2012 randomised, double-blind, placebo-controlled study published in the Indian Journal of Psychological Medicine (Chandrasekhar et al., 2012) found that adults taking 300 mg of a high-concentration ashwagandha root extract twice daily for 60 days showed a 27.9% reduction in serum cortisol, compared to 7.9% in the placebo group. The same study reported a 44% reduction in self-reported stress scores versus 5.5% in placebo.
Clinical Precision: It's worth being precise here: this is one well-designed study, not a guarantee of what will happen for every individual. But it's consistent with other smaller trials, which is why ashwagandha's reputation as a "stress-support" herb has scientific grounding, not just tradition.
Ashwagandha Benefits: What the Research Actually Shows
1. Stress and Anxiety
Beyond the Chandrasekhar study, a 2019 randomised controlled trial published in Medicine (Baltimore) (Lopresti et al., 2019) found that adults taking ashwagandha root extract over 60 days had significantly greater reductions in serum cortisol and self-reported stress and anxiety compared to placebo. A separate 2019 study in Cureus (Salve et al., 2019) reported similar anxiolytic effects in healthy adults over an eight-week period.
2. Sleep Quality
Poor sleep and high stress often travel together, and this is where a lot of Indian women in their 30s and 40s — juggling work deadlines, children's school routines and ageing parents — feel the squeeze hardest. A 2019 double-blind, placebo-controlled study in Cureus (Langade et al., 2019) found that participants taking ashwagandha root extract reported improvements in sleep quality and sleep onset latency over eight weeks compared to placebo. The effect was more pronounced in those with existing sleep difficulty than in those with no sleep complaints to begin with.
3. Thyroid Function
This one needs careful framing. A 2018 randomised controlled trial in the Journal of Alternative and Complementary Medicine (Sharma, Basu & Singh, 2018) studied adults with subclinical hypothyroidism and found that ashwagandha root extract was associated with improvements in TSH, T3 and T4 levels compared to placebo over eight weeks. This is genuinely interesting research, but it also means ashwagandha can influence thyroid hormone levels, which is exactly why anyone with an existing thyroid condition, especially hyperthyroidism, should talk to their doctor before taking it rather than self-start it alongside thyroid medication.
4. Strength and Physical Performance
Most of the research on ashwagandha and muscle strength has been done in men. A 2015 study in the Journal of the International Society of Sports Nutrition (Wankhede et al., 2015) found that healthy men taking ashwagandha root extract alongside resistance training had greater gains in muscle strength and size compared to placebo over eight weeks. Data specifically on women's strength outcomes is thinner, so this benefit is better described as promising rather than confirmed for the female body.
5. Mood and General Wellbeing
Several of the stress and anxiety trials mentioned above also tracked secondary measures of general wellbeing and mood, and most reported improvements alongside the primary stress and cortisol findings. The honest caveat: wellbeing is subjective and harder to measure cleanly than a cortisol blood test, so these findings are supportive rather than definitive.
A Note on Where the Research Comes From
Most of the strongest clinical trials on ashwagandha, including the ones cited above, were conducted in India, which is genuinely useful since it means the research population is more likely to reflect Indian diets, body types and lifestyles than herbs studied mainly in the West.
That said, sample sizes in these trials are typically modest (60 to 120 participants), and few trials have specifically isolated outcomes for Indian women in the 30-45 age group going through the specific load of perimenopause, postpartum recovery, or dual-career households. This is an area where more targeted research would help.
Ashwagandha Uses: The Forms You'll Find in India
Ashwagandha is sold in several forms, and the form matters because concentration and standardisation affect both dose and what's actually been studied.
| Form | What It Is | Typical Studied Dose | Clinical Notes |
|---|---|---|---|
| Root powder (Churna) | Dried, ground whole root, traditional Ayurvedic form | 3–6 g/day in classical use | Lower withanolide concentration, strong earthy taste, harder to standardise |
| KSM-66 (root extract) | Full-spectrum root-only extract, most widely used in research | 300–600 mg/day | Used in most of the large clinical trials cited above (5% withanolides) |
| Sensoril (root and leaf) | Combines root and leaf, higher withanolide glycoside content | 125–500 mg/day | Studied more specifically for stress and sleep than physical strength |
| Capsules, tablets, gummies | Commercial formats using one of the extracts above | Varies by product | Check label for which extract and how many mg of withanolides per serving |
Buyer's Checklist: If a product doesn't specify which extract it uses and at what standardised withanolide percentage, it's hard to know what you're actually getting, or whether it resembles anything used in the studies above.
Ashwagandha Ke Fayde: Ayurveda's View vs What Science Confirms
In classical Ayurvedic texts, ashwagandha ke fayde (the benefits of ashwagandha) are described broadly: supporting strength, vitality, restful sleep and resilience against daily fatigue. Modern clinical research hasn't validated every traditional claim, but it has found reasonably consistent support for a narrower, more specific set of effects, mainly around stress, cortisol, sleep quality and, in subclinical hypothyroidism, thyroid hormone balance.
The useful way to hold both of these: Ayurveda identified a plant worth paying attention to centuries before modern trials existed, and science has since confirmed some, not all, of what tradition claimed. That's not a contradiction, it's how herbal medicine and clinical research are supposed to meet.
Who Should Be Careful With Ashwagandha
Ashwagandha is generally well tolerated in the doses used in clinical trials, but it isn't right for everyone. Some groups should speak with a doctor before starting it, not stop or adjust any existing prescription on their own.
How to Take Ashwagandha: What the Evidence-Based Doses Look Like
Most of the positive findings described above come from daily doses between 300 mg and 600 mg of a standardised root extract, typically taken for 8 to 12 weeks in the actual trials, not indefinitely without review. A few practical points worth knowing before you start:
- Look for standardisation: Look for the specific extract name (such as KSM-66 or Sensoril) and its withanolide percentage on the label, not just "ashwagandha" with no further detail.
- Give it weeks, not days: Effects in the cited studies built up over weeks, not days, so there's no honest basis for expecting an overnight change.
- Timing: Taking it at a consistent time each day (commonly with dinner or before bed, since many people report a calming effect) is a reasonable starting approach, though timing wasn't rigorously tested across trials.
- Check with your doctor: If you're already on any prescription medication, particularly for thyroid, mood, or sleep, loop in your doctor before adding ashwagandha, rather than layering it on your own.
- Monitor tolerance: Pause and consult a doctor if you notice unusual fatigue, nausea, yellowing of the skin or eyes, or digestive upset after starting it.
"Ashwagandha has a genuinely unusual position among herbal supplements: thousands of years of traditional use and a real body of modern clinical research pointing in similar directions, particularly for stress and sleep. That combination is rare, and it's also why it deserves to be taken seriously rather than treated as either an outright cure-all or dismissed as folklore. The honest picture sits in between: a well-studied adaptogen with specific, evidence-backed uses, real contraindications, and still some open questions, especially for Indian women navigating the particular stress load of their 30s and 40s."
Frequently Asked Questions
What is ashwagandha used for?
Ashwagandha is most commonly used for managing everyday stress, supporting sleep quality and, in some research, supporting thyroid hormone balance in people with subclinical hypothyroidism. It is not a treatment for diagnosed medical conditions, and anyone with an existing health condition should check with their doctor before using it.
How long does ashwagandha take to work?
In the clinical trials that found benefits for stress and sleep, participants took it daily for 8 to 12 weeks before meaningful changes were measured. There is no reliable evidence that it produces noticeable effects within days.
Can ashwagandha help with anxiety?
Several randomised, placebo-controlled studies, including trials published in the Indian Journal of Psychological Medicine (2012) and Medicine (Baltimore) (2019), found reductions in self-reported stress and anxiety scores with ashwagandha root extract compared to placebo. These are promising findings, not a substitute for professional mental health care if anxiety is significantly affecting daily life.
Is ashwagandha safe to take every day?
In studies, doses of 300 to 600 mg of standardised root extract taken daily for up to 12 weeks were generally well tolerated. Long-term daily use beyond that period hasn't been studied as extensively, so periodic breaks and a doctor's input are sensible, especially for women with thyroid or autoimmune conditions.
Can ashwagandha affect thyroid levels?
Yes, a 2018 randomised controlled trial found that ashwagandha root extract improved TSH, T3 and T4 levels in people with subclinical hypothyroidism. Because of this, anyone with a thyroid condition or on thyroid medication should talk to their doctor before taking it.