H HiPerformance CultureThe Evidence
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Trend Breakdown
The Evidence

Does ashwagandha actually lower stress and cortisol?

Ashwagandha has graduated from Ayurvedic tradition to clinical trial to TikTok wellness staple, and the science is more interesting than the hype suggests. Serum cortisol falls measurably in RCTs. Whether that biological shift translates to felt stress relief is a separate, genuinely contested question.

Updated Published 18 Jun 2026 · Last reviewed 18 Jun 2026 · 5 sources
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Trend Science
Breakdown
Evidence-graded series
02What's being claimed

Ashwagandha supplements lower your body's stress hormone, reduce anxiety, and restore calm from the inside out. The herb's 3,000-year track record in Ayurvedic medicine is now backed by double-blind clinical trials, making it the most scientifically credible natural adaptogen available to anyone seeking relief from chronic stress without pharmaceutical intervention.

The appeal is more rational than most wellness trends. Ashwagandha contains withanolides, bioactive compounds that appear to modulate the hypothalamic-pituitary-adrenal axis (the system that regulates cortisol secretion). That mechanistic plausibility gave Western researchers a testable hypothesis, and they tested it: Chandrasekhar et al. published the first rigorous double-blind RCT in 2012 1, confirming significant reductions in serum cortisol within 60 days of supplementation with a standardised KSM-66 extract.

TikTok amplified the reach far beyond the clinical literature. Wellness creators promoted ashwagandha as a near-universal stress solution, citing peer-reviewed studies accurately enough to avoid obvious misinformation while glossing over what those studies actually measured. The result: a $721 million global supplement market driven partly by genuine efficacy data and partly by the conflation of a biological marker falling with stress itself disappearing, a gap the evidence does not close.

Origin
Ayurvedic Medicine
Ashwagandha has been used as a rasayana rejuvenating tonic in Ayurvedic medicine for over 3,000 years.
→
Vector
Western Adaptogen Research
Indian and European researchers published mechanistic RCTs from the 2000s, lending clinical credibility to Western markets.
→
Spike
#ashwagandha TikTok
TikTok wellness creators drove 823,000 monthly searches and a $721 million global supplement market by 2024.
"I have been taking ashwagandha for three months and my cortisol is down, my anxiety is lower, and I actually feel like myself again. The science finally caught up with what Ayurveda has known for thousands of years."
— Representative of the claim as it circulates online
03The evidence verdict
H
HiPerformance Culture The Evidence · Trend Breakdown
Verdict

Ashwagandha measurably lowers serum cortisol; whether that means you will feel less stressed is genuinely contested.

Hype Evidence
This trend lands here
Low Moderate High
Moderate confidence 5 sources cited · 2 RCTs, 2 meta-analyses, 1 safety case series · 2012-2025
✓

What holds up

✓
At 300-600 mg/day, standardised ashwagandha extract significantly reduces morning serum cortisol versus placebo within 60 days in double-blind RCTs. 1
Gold
✓
A 2025 meta-analysis of 15 RCTs (n=873) found significant reductions in serum cortisol, Perceived Stress Scale scores, and HAM-A anxiety scores. 3
Gold
✓
Anxiolytic effects (reduced HAM-A scores) are consistent across independent trials, pointing to a pharmacological mechanism beyond placebo. 2
Silver
✕

What doesn't

✕
Cortisol reduction does not reliably translate to felt stress relief: Albalawi 2025 found a significant cortisol drop but no statistically significant effect on Perceived Stress Scale scores (P=0.40). 4
Silver
✕
Rare but causally confirmed herb-induced liver injury has been RUCAM-linked to ashwagandha; anyone with liver disease or on hepatotoxic medications faces elevated risk. 5
Safety-critical Gold
✕
Virtually all positive trial data uses proprietary, industry-funded extracts (KSM-66, Shoden); results may not generalise to unbranded or whole-root powders sold online. 1
Silver
04The studies
Scored on Design quality Measurement precision Causal clarity Replication value
Gold
P=0.0006 Cortisol reduction vs placebo at 60 days
RCT · n=64
Chandrasekhar et al. Indian Journal of Psychological Medicine · 2012
Adults taking KSM-66 ashwagandha root extract 300 mg twice daily for 60 days showed highly significant reductions in serum cortisol (P=0.0006) and all stress and anxiety subscales versus placebo. The foundational RCT that established ashwagandha's cortisol-modulating credibility in Western clinical literature.
doi:10.4103/0253-7176.106022 Verify ↗
Gold
P<0.001 Morning cortisol reduction vs placebo
RCT · n=60
Lopresti et al. Medicine · 2019
240 mg of Shoden ashwagandha extract once daily for 60 days produced significant reductions in morning cortisol (P<0.001) and HAM-A anxiety scores (P=0.040) versus placebo. DHEA-S also fell significantly. The small n and single ashwagandha preparation limit generalisation.
doi:10.1097/md.0000000000017186 Verify ↗
Gold
15 RCTs Pooled; n=873 stressed or anxious adults
Systematic review and meta-analysis · 15 RCTs · n=873
Bachour et al. BJPsych Open · 2025
Pooling 15 randomised trials, ashwagandha supplementation produced statistically significant reductions in serum cortisol, Perceived Stress Scale scores, and Hamilton Anxiety Rating Scale scores compared with placebo. The largest and most recent meta-analysis on this question to date.
doi:10.1192/bjo.2025.10136 Verify ↗
Silver
P = 0.40 Perceived Stress Scale: no significant reduction
Systematic review and meta-analysis · 7 cortisol + 6 PSS studies · n=488
Albalawi Nutrition and Health · 2025
Ashwagandha produced a statistically significant reduction in serum cortisol (-1.16 µg/dL; P<0.001) but had no significant effect on Perceived Stress Scale scores (SMD=-0.355; P=0.40). This dissociation between biological and subjective stress outcomes is the most important limiting finding in the literature.
doi:10.1177/02601060251363647 Verify ↗
Contested — Contradicts broader meta-analyses showing PSS reductions; difference may reflect heterogeneous study populations and extract types across included RCTs.
Gold Case series with RUCAM causality assessment · 2 new cases + literature review
Bokan et al. Pharmaceuticals · 2023
Two new cases of ashwagandha-induced liver injury (1 hepatocellular, 1 mixed pattern) were RUCAM-scored as 'probable' causation. Liver enzymes and bilirubin normalised after discontinuation. Prior published cases cluster at doses of 450 mg or higher for 45+ days. Mechanism may involve withanone overwhelming hepatic glutathione.
doi:10.3390/ph16081129 Verify ↗
05So what do you actually do

If you want to try it, the evidence supports a narrow, safe version.

Use a standardised extract, set realistic expectations, and check your exclusion criteria before starting.

01Use a standardised extract (KSM-66 or Shoden) at 300-600 mg per day.
02Commit to a minimum eight-week trial before assessing whether it is working.
03Do not take ashwagandha if you have liver disease, thyroid dysfunction, or are pregnant.
04Check for interactions with immunosuppressants and thyroid medications before starting.
05Treat unbranded or whole-root powders as a different and unvalidated product.
06The verdict triad
Claim

Cortisol Falls in RCTs

Ashwagandha measurably lowers serum cortisol in double-blind trials. The biological signal is reproducible and statistically robust across independent research groups. Two RCTs and a 2025 meta-analysis of 15 trials all confirm the cortisol effect with consistent effect sizes. The question is not whether cortisol falls, but what that fall means.

Consequence

Chronic Cortisol Damages Core Functions

Chronically elevated cortisol impairs sleep architecture, suppresses immune function, and degrades working memory over time. These are not theoretical downstream effects; they are documented physiological consequences of sustained HPA-axis activation. If ashwagandha genuinely blunts that activation, the clinical value would extend well beyond subjective stress scores.

Lever

Get the Extract Right First

Use a standardised extract (KSM-66 or Shoden) at 300-600 mg daily for at least eight weeks. Treat liver disease, thyroid dysfunction, and pregnancy as genuine exclusion criteria. Unbranded whole-root powders are not equivalent to the tested preparations; the evidence base does not extend to them.

08What to do next
What to do next

Want to know whether ashwagandha fits your stress profile?

HPC's Hormones and Stress Assessment maps your cortisol patterns, lifestyle stressors, and supplement history to give you a personalised protocol. Takes four minutes.

Take the assessment
09Share & references
Update log
18 Jun 2026First published. 5 sources reviewed; includes 2025 meta-analyses from BJPsych Open and Nutrition and Health.
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Bibliography · every source, resolvable
01Chandrasekhar, K., Kapoor, J. & Anishetty, S. (2012). A Prospective, Randomized Double-Blind, Placebo-Controlled Study of Safety and Efficacy of a High-Concentration Full-Spectrum Extract of Ashwagandha Root in Reducing Stress and Anxiety in Adults. Indian Journal of Psychological Medicine, 34(3), 255-262. doi:10.4103/0253-7176.106022 Verify ↗Gold
02Lopresti, A.L., Smith, S.J., Malvi, H. & Kodgule, R. (2019). An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract. Medicine, 98(37), e17186. doi:10.1097/md.0000000000017186 Verify ↗Gold
03Bachour, G., Samir, A., Haddad, S., Houssaini, M.A. & El Radad, M. (2025). Effects of Ashwagandha Supplements on Cortisol, Stress, and Anxiety Levels in Adults: A Systematic Review and Meta-Analysis. BJPsych Open, 11(S1), S39-S39. doi:10.1192/bjo.2025.10136 Verify ↗Gold
04Albalawi, A.A. (2025). Dual impact of Ashwagandha: Significant cortisol reduction but no effects on perceived stress – A systematic review and meta-analysis. Nutrition and Health, 31(4), 1395-1408. doi:10.1177/02601060251363647 Verify ↗Silver
05Bokan, G., Glamočanin, T., Mavija, Z., Vidović, B., Stojanović, A., Björnsson, E.S. & Vučić, V. (2023). Herb-Induced Liver Injury by Ayurvedic Ashwagandha as Assessed for Causality by the Updated RUCAM: An Emerging Cause. Pharmaceuticals, 16(8), 1129. doi:10.3390/ph16081129 Verify ↗Gold
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