Does ashwagandha actually lower cortisol, and by how much?

Does Ashwagandha Lower Cortisol? And by How Much?

Cortisol, often called the “stress hormone,” plays a crucial role in our body’s response to stress, metabolism, and immune function. Elevated cortisol over time can contribute to anxiety, sleep disturbances, weight gain, and other health issues. Many people ask, does ashwagandha lower cortisol, and if so, by what degree? Below, we explore the evidence from credible, peer-reviewed studies to give you a clear picture.

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What Is Ashwagandha?

• A herb used for centuries in Ayurvedic medicine
• Classified as an adaptogen, meaning it may help the body resist physical, chemical, and biological stressors
• Typically taken as a standardized root extract, most commonly in doses ranging from 250–600 mg per day

Why Cortisol Matters

• Produced by the adrenal glands in response to stress
• Regulates metabolism, blood sugar, inflammation, and blood pressure
• Chronically high cortisol can increase risk of:
  • Anxiety and depression
  • Weight gain, especially around the abdomen
  • Impaired immune function
  • Poor sleep quality

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How Ashwagandha May Affect Cortisol

Ashwagandha appears to influence the hypothalamic–pituitary–adrenal (HPA) axis, the system that controls cortisol production. By modulating signaling in this axis, ashwagandha may help normalize cortisol levels when they’re elevated.

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Key Clinical Studies

Here’s a summary of the most robust trials examining cortisol changes:

• Chandrasekhar et al., 2012

  • Design: Randomized, double-blind, placebo-controlled
  • Participants: 64 adults under chronic stress
  • Dose: 300 mg high-concentration root extract, twice daily for 60 days
  • Results:
    • Ashwagandha group saw a 27.9% reduction in serum cortisol
    • Placebo group saw an 8.9% reduction
    • Statistical significance: p < 0.0001

• Auddy et al., 2008

  • Design: Randomized, double-blind
  • Participants: 98 adults with self-reported stress
  • Dose: 250 mg standardized extract, twice daily for 60 days
  • Results:
    • Cortisol decreased by 16% in the ashwagandha group
    • Placebo group showed minimal change

• Lopresti et al., 2019 (Systematic Review)

  • Combined data from multiple RCTs
  • Average cortisol reduction: 14–22% compared to placebo
  • Concluded moderate-strength evidence supports cortisol-lowering effects

• Additional Trials

  • Doses from 125 mg to 600 mg daily
  • Treatment durations of 6–12 weeks
  • Cortisol reductions consistently ranged from 10% to 28%

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What These Numbers Mean

• On average, ashwagandha can lower serum cortisol by roughly 15–28% in stressed adults.
• Individual responses vary based on:
  • Dose and extract standardization
  • Duration of supplementation
  • Baseline stress levels and health status
• Placebo groups often show small reductions (around 5–10%), likely from study participation effects

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Practical Takeaways

1. Dosage

   • Typical: 300–600 mg of a standardized root extract per day
   • Split into two doses (morning and evening) for steady support

2. Duration

   • Noticeable changes in cortisol often occur by 6–8 weeks
   • Longer use (up to 12 weeks) may deliver more consistent effects

3. Formulation

   • Look for extracts standardized to at least 5% withanolides (the active compounds)
   • Third-party testing (e.g., USP, NSF) ensures quality and purity

4. Safety

   • Generally well tolerated
   • Mild side effects: digestive upset, drowsiness in some people
   • Caution if you have thyroid issues, ashwagandha may influence thyroid hormones

5. Interactions

   • May enhance the effects of sedatives or thyroid medications
   • Speak with your doctor if you’re on prescription drugs or have chronic health conditions

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Beyond Supplements: Tracking Your Stress

If you’re feeling persistently stressed or notice symptoms like sleep disturbances, unexplained fatigue, or mood changes, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker. It can help you clarify whether your symptoms may stem from stress, cortisol imbalance, or another health concern—all before you see a healthcare provider.

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When to Speak to a Doctor

Ashwagandha may help lower cortisol, but it’s not a substitute for medical evaluation if you have:

• Severe or persistent anxiety or depression
• Unexplained weight changes
• Blood sugar irregularities (e.g., diabetes)
• High blood pressure
• Thyroid disorders

Always consult a qualified healthcare professional before starting any supplement—especially if you have a serious or potentially life-threatening condition.

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Bottom Line

• Does ashwagandha lower cortisol? Yes—most studies show reductions in the range of 15–28% compared to placebo.
• For many people under chronic stress, ashwagandha can be a safe, natural way to support a healthier HPA axis.
• Quality, dosage, and consistency matter. Look for well-standardized extracts and allow at least 6–8 weeks to assess benefit.
• Never ignore serious or persistent symptoms. Speak to your doctor or try a free, online symptom check, using the doctor approved Ubie Symptom Checker to guide your next steps.

By understanding the evidence, you can make an informed choice about whether ashwagandha fits into your wellness plan—and how it might help in your journey to balanced stress and cortisol levels.