Dr. Rachel StoneAshwagandha has quietly become one of the most researched adaptogenic herbs on earth — with a growing body of clinical evidence supporting its use for stress, anxiety, hormonal balance, athletic performance, and sleep. But for women specifically, questions have emerged about how it affects oestrogen, progesterone, cortisol, and the menstrual cycle. Here’s what the evidence actually shows.
Ashwagandha Benefits for Women: What the Research Shows
1. Stress and Cortisol Reduction
This is ashwagandha’s most robustly evidenced benefit. A 2019 RCT published in Medicine found that 240mg of ashwagandha extract daily for 60 days reduced serum cortisol by 22.2%, and significantly reduced perceived stress scores compared to placebo. A 2012 RCT found 300mg twice daily reduced cortisol by 27.9% over 60 days.
For women experiencing chronic stress — which disproportionately affects female hormonal function through HPA-axis dysregulation — this cortisol-lowering effect has downstream benefits on thyroid function, sex hormone balance, sleep quality, and body composition.
2. Sexual Function and Desire
A 2015 RCT specifically in women (n=50) found ashwagandha (300mg twice daily for 8 weeks) significantly improved sexual function scores including arousal, lubrication, orgasm satisfaction, and overall satisfaction compared to placebo. The researchers proposed mechanisms including reduced cortisol (which suppresses libido), DHEA support, and improved blood flow.
3. Thyroid Support
Ashwagandha has demonstrated effects on thyroid hormone levels in clinical studies. A 2018 RCT in subclinical hypothyroid patients found ashwagandha supplementation significantly increased TSH, T3, and T4 levels compared to placebo over 8 weeks. Thyroid dysfunction is significantly more common in women — particularly hypothyroidism — making this relevant for a large proportion of female supplement users.
4. Sleep Quality
Multiple RCTs have shown ashwagandha improves sleep quality, sleep onset time, and morning alertness. The primary mechanism appears to be the GABA-mimetic activity of triethylene glycol — a constituent of ashwagandha leaves — which promotes non-REM sleep. For women experiencing peri-menopausal sleep disruption or stress-related insomnia, this is a meaningful benefit.
5. Menopause Symptoms
A 2021 RCT specifically in perimenopausal and postmenopausal women found ashwagandha root extract (300mg twice daily for 8 weeks) significantly reduced menopause symptom scores including hot flushes, anxiety, and urogenital discomfort compared to placebo.
6. Athletic Performance and Body Composition
While most athletic performance research is in men, ashwagandha’s cortisol-lowering and testosterone-supporting effects are relevant to women too. A 2015 study found significant improvements in VO2 max, muscle strength, and recovery in athletes using ashwagandha. For women engaged in strength training, reduced cortisol from ashwagandha may support better body composition by reducing stress-induced fat storage, particularly abdominal fat.
How Long Does Ashwagandha Take to Work for Women?
Research suggests:
- Stress and anxiety: 2–4 weeks for initial benefit; full effects at 8–12 weeks
- Sleep: 1–2 weeks for early improvement; full benefit at 6–8 weeks
- Sexual function: 8 weeks in the clinical trial
- Thyroid: 8 weeks in clinical research
- Menopause symptoms: 8 weeks in clinical research
Recommended Dose
The most studied dose in clinical trials is 300mg twice daily (600mg total) of a standardised root extract. Lower doses (240–600mg once daily) are also commonly used and show benefit. KSM-66 and Sensoril are the two most studied branded ashwagandha extracts with standardised withanolide content.
Frequently Asked Questions
Clinical research in women shows ashwagandha reduces cortisol by 22–28%, improves sexual function and arousal, supports thyroid hormone levels, improves sleep quality, reduces menopause symptoms (hot flushes, anxiety, urogenital discomfort), and may support body composition through cortisol reduction. Its adaptogenic properties make it broadly relevant for hormonal balance in women experiencing chronic stress.
Yes — ashwagandha is well-tolerated in the clinical research literature at doses of 300–600mg daily. Side effects are generally mild (GI discomfort, rarely drowsiness). However, it should be avoided during pregnancy (may stimulate uterine contractions), used cautiously in those with thyroid conditions already on medication, and is not recommended for people with autoimmune conditions without medical supervision.
Ashwagandha can indirectly support menstrual regularity through cortisol reduction — chronic stress disrupts the HPO (hypothalamic-pituitary-ovarian) axis, causing irregular cycles. By reducing cortisol and supporting hormonal balance, ashwagandha may help restore more regular cycling in stress-affected women. There is no evidence it directly interferes with the menstrual cycle in healthy women.
Both timing approaches are used in clinical research. For sleep benefits, taking it in the evening (1–2 hours before bed) is preferable. For stress and cortisol reduction throughout the day, morning dosing or split morning/evening dosing (300mg twice daily as used in most trials) is the most evidence-based approach. Take with food to reduce the chance of mild GI discomfort.
This article is for informational purposes only. Consult a healthcare provider before starting ashwagandha, particularly during pregnancy, if taking thyroid medication, or with autoimmune conditions.
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Related reading: Ashwagandha Benefits for Men, Does Ashwagandha Help With Anxiety?, Does Ashwagandha Increase Estrogen?, How Long Does Ashwagandha Take to Work?.
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Dr. Rachel Stone
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