FIND YOUR ZEN: Ashwagandha — What the Research Actually Says
By Fitra Health Editorial Team
Goop sells it for $60. Your gym buddy swears by it. It's Amazon's number one supplement. But ashwagandha isn't for everyone. Here's what the research says, who should avoid it, and what to look for.
Ashwagandha is everywhere. Goop sells it for $60 a bottle. Your gym buddy takes it before bed. It's Amazon's number one selling supplement. AG1 put it in their formula. Every wellness podcast has mentioned it at least once.
The supplement industry has turned ashwagandha into a personality trait. But somewhere underneath the marketing, there is actual research. And it says something more nuanced than "take this and feel better."
What is FIND YOUR ZEN?
Every Thursday, Fitra spotlights one stress or mental health topic that matters. No protocols. No morning stacks. Just science you can use.
What the Research Actually Says
A 2019 randomized, double-blind, placebo-controlled study published in Medicine (Lopresti et al., PubMed 31517876) enrolled 60 adults experiencing stress. Half received 240mg of ashwagandha root extract daily. Half received placebo. After 60 days, the ashwagandha group showed significantly reduced cortisol levels and improved scores on perceived stress, sleep quality, and overall wellbeing compared to placebo.
An earlier systematic review in the Journal of Alternative and Complementary Medicine (Pratte et al., PubMed 25368293) analyzed five randomized controlled trials and concluded that ashwagandha supplementation was associated with significant reductions in anxiety and stress scores compared to placebo across all studies examined.
The dosing range across most studies: 300 to 600mg per day of standardized root extract. Not leaf extract. Not powder in a smoothie from a bulk bin. Standardized root extract, typically standardized to withanolide content.
The Numbers
In the Lopresti study, the ashwagandha group saw approximately a 30% reduction in cortisol levels over 60 days. That is a clinically meaningful change. Cortisol is the hormone most associated with chronic stress, and sustained elevation is linked to weight gain, sleep disruption, immune suppression, and cognitive impairment.
But It's Not for Everyone
This is the part the supplement industry skips. Ashwagandha is not universally safe. Contraindications and cautions include:
- Thyroid conditions: ashwagandha may increase thyroid hormone production. For people with hyperthyroidism or Hashimoto's, this is a problem, not a benefit.
- Pregnancy: ashwagandha is traditionally contraindicated during pregnancy.
- Autoimmune disorders: as an immune modulator, it may worsen autoimmune conditions in some individuals.
- Drug interactions: ashwagandha may interact with sedatives, thyroid medications, immunosuppressants, and blood sugar lowering medications.
- Liver concerns: rare reports of liver injury have been associated with ashwagandha products, likely related to contaminated or adulterated formulations.
This is why Amazon reviews are not a clinical assessment. An ND checks your thyroid function, medication list, autoimmune status, and health history before recommending any supplement.
What to Look For
- KSM-66 or Sensoril branded extract (these are the formulations used in clinical trials)
- Standardized to withanolides (the active compounds)
- Root extract, not leaf (leaf extracts have a different safety profile)
- Third-party tested for purity and contaminants
- 300 to 600mg per day dosing
Supplements Need Context
The supplement industry wants you to self-prescribe based on trending posts and Amazon ratings. A naturopathic doctor assesses your full clinical picture: what medications you take, what conditions you have, what your lab values show, and whether ashwagandha is the right intervention for your specific situation. Sometimes it is. Sometimes magnesium glycinate is the better choice. Sometimes the answer is sleep hygiene, not another capsule.
Context is the difference between evidence-informed supplementation and expensive guessing.
References
- Lopresti AL, Smith SJ, Malvi H, Kodgule R. An investigation into the stress-relieving and pharmacological actions of an ashwagandha extract. Medicine. 2019;98(37). PubMed: 31517876
- Pratte MA, Nanavati KB, Young V, Morley CP. An alternative treatment for anxiety: a systematic review of human trial results reported for the Ayurvedic herb ashwagandha. J Altern Complement Med. 2014;20(12):901-908. PubMed: 25368293
This content is for educational purposes only and does not constitute medical advice. Always consult a licensed naturopathic doctor or healthcare provider before starting any supplement.
Want supplement guidance that's actually personalized? Book a virtual consultation with a licensed ND at fitrahealth.ca. 60-minute consultations. Ontario only.
Related articles
Dark Circles: The Iron Deficiency Connection Nobody Talks About
You've tried Tatcha, The Ordinary, cold spoons, and caffeine serums. Nobody asked if your ferritin was low. Research published in 2023 can now detect iron deficiency from eye images alone. Your under-eyes already know.
Magnesium and Anxiety: What Your Supplement Isn't Telling You
75% of adults are deficient. Most are taking the wrong form. The supplement industry discovered magnesium glycinate and treated it like a personality trait. Here's what the research actually says.