Ashwagandha is one of the most researched herbal supplements for stress — but it’s not a miracle cure. Here’s what the science actually shows.
The bottom line
If you’re looking for a natural supplement that may help you manage stress, support focus, or complement your training, ashwagandha is one of the most researched herbal options available. The strongest evidence supports its use for reducing stress and anxiety in some adults. Research into memory, cognitive performance, strength and recovery is promising, but less consistent — and more high-quality studies are still needed.
Why is ashwagandha so popular?
Ashwagandha (Withania somnifera) has become one of the world’s most popular herbal supplements. Current evidence suggests it may help support stress resilience, mild anxiety symptoms, sleep quality (in some people), certain aspects of cognitive performance, and muscle strength and recovery when combined with resistance training. Benefits vary between individuals, and many studies have been small or short-term.
1. Stress and anxiety: where the evidence is strongest
Strongest evidenceAmong all its potential benefits, stress reduction has the most consistent scientific support. Several systematic reviews and meta-analyses of randomised controlled trials have found ashwagandha can reduce self-reported stress and anxiety compared with placebo in adults experiencing elevated stress. Daily doses between 240 mg and 600 mg of standardised extract have shown benefits, though the optimal dose depends on the extract. Some research has reported reductions in cortisol — the body’s primary stress hormone — but these findings aren’t consistent across every study. A 2024 clinical trial found a standardised extract (35% withanolide glycosides) reduced stress and anxiety at both 60 mg and 120 mg daily.
What the evidence says: moderate-quality evidence supports ashwagandha as a potential option for reducing stress and mild anxiety in otherwise healthy adults. It should not replace professional treatment for anxiety disorders.
2. Can ashwagandha improve memory and focus?
Promising but earlyResearch into cognitive performance is growing, but the evidence isn’t as strong as it is for stress. Several trials have reported improvements in attention, processing speed, executive function, working memory and reaction time. A 2017 placebo-controlled trial found improvements in several cognitive measures after 300 mg of root extract twice daily for eight weeks, and a 2019 systematic review concluded ashwagandha may improve performance on certain cognitive tasks — while noting studies were generally small.
What the evidence says: early findings are promising, but there isn’t enough high-quality evidence to conclude ashwagandha reliably improves cognition in the general population.
3. Can ashwagandha help your training?
Emerging evidenceAshwagandha has attracted interest in sports nutrition. When combined with a structured strength program, several randomised controlled trials suggest it may contribute to improvements in muscle strength, power output, muscle size and recovery. One eight-week study in men with limited training experience found those taking 300 mg of standardised root extract twice daily gained more bench press and leg extension strength than placebo. The Australian Institute of Sport currently classifies ashwagandha as a supplement with emerging evidence rather than established performance benefits.
How does ashwagandha work?
Its naturally occurring compounds, called withanolides, are believed to influence several pathways involved in the body’s stress response. Research suggests it may help regulate the body’s stress-response systems (including the HPA axis), influence neurotransmitters involved in mood and relaxation, and show antioxidant and anti-inflammatory activity in lab and animal studies. These mechanisms are biologically plausible, but don’t automatically translate into clinical benefits in humans.
A herb with thousands of years of history
Long before modern research, ashwagandha was widely used in Ayurveda as a Rasayana — a rejuvenating herb believed to support vitality and resilience. Historical use has inspired modern research, but shouldn’t be considered proof of effectiveness.
Is ashwagandha right for you?
If your goal is to manage everyday stress, improve training recovery or support overall wellbeing, ashwagandha may be worth considering. Look for products with standardised extracts, tested for purity, that clearly state their withanolide content. People who are pregnant or breastfeeding should avoid ashwagandha unless advised otherwise. Those with thyroid disorders, autoimmune conditions, or taking prescription medications should speak with their healthcare provider first, as interactions may occur.
Common questions
Ashwagandha FAQ
What is ashwagandha good for?
Its best-supported use is reducing stress and mild anxiety in some adults. It’s also studied for sleep quality, cognitive performance and — combined with resistance training — muscle strength and recovery, though evidence in those areas is less consistent.
Does ashwagandha actually work for stress?
For stress and mild anxiety, yes — multiple randomised trials and meta-analyses show reductions versus placebo in adults with elevated stress. It shouldn’t replace professional treatment for anxiety disorders.
How much ashwagandha should I take?
Trials showing benefits generally used 240–600 mg of standardised extract per day, though the ideal amount depends on the specific extract. Follow the product directions.
How long does ashwagandha take to work?
Many stress studies ran over 6–8 weeks of daily use, so it’s best taken consistently rather than as a one-off. Individual responses vary.
Is ashwagandha safe?
It’s generally well tolerated in studies. Those pregnant or breastfeeding should avoid it, and anyone with a thyroid or autoimmune condition, or taking medication, should check with a healthcare professional first.
If you’re interested, feel free to explore our recommended range of high-quality superfood supplements here.
Sources
- Salve J, et al. Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults: a double-blind, randomized, placebo-controlled clinical study, 2019. — stress/anxiety.
- Chandrasekhar K, et al. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration ashwagandha root extract in reducing stress and anxiety. Indian J Psychol Med, 2012. — stress/cortisol.
- Choudhary D, et al. Efficacy and safety of ashwagandha root extract in improving memory and cognitive functions. J Diet Suppl, 2017. — cognition.
- Wankhede S, et al. Examining the effect of Withania somnifera supplementation on muscle strength and recovery. J Int Soc Sports Nutr, 2015. — strength/training.
- Bonilla DA, et al. Effects of ashwagandha on physical performance: systematic review and meta-analysis. J Funct Morphol Kinesiol, 2021. — exercise review.
This article is for general information only and is not medical advice. Australian Herbal products are not intended to diagnose, treat, cure or prevent any disease. Speak with a qualified healthcare professional before starting any supplement, particularly if you are pregnant, breastfeeding, taking medication or managing a health condition. Ashwagandha is a sensitive topic for some readers; if you are struggling with stress or anxiety, consider speaking with a healthcare professional.