Herbs & botanicals / Withania somnifera
Ashwagandha
Stress and sleep research, with the preparation and limits in view.
Some ashwagandha extracts have improved perceived stress or sleep in short human trials. The evidence is specific to the extract, dose, and population tested. It does not establish a universal hormone-balancing treatment, and liver, thyroid, pregnancy, and medication considerations matter.12
Research prepared 2026-09-14. Clinical review pending.
overview
What “adaptogen” does and does not tell you
Ashwagandha has a history of Ayurvedic use. “Adaptogen” describes a proposed stress-response effect, not a diagnosis or standardized clinical outcome. Root and leaf have different chemical compositions.2
For a useful decision, translate the claim into something measurable: less perceived stress, less time awake at night, or improved daily functioning. A lower laboratory cortisol value alone does not answer all of those questions.
foods
A botanical preparation, not a dietary essential
Products contain root powder, root extract, or root-and-leaf extract. These preparations are not interchangeable.2
The traditional name “Indian ginseng” does not make it Panax ginseng. Check the botanical identity.2
supplements
The milligrams are only one part of the label
Record species, plant part, extract amount, withanolide specification, and added ingredients. Equal milligrams do not make root powder and concentrated extract equivalent.2
A higher withanolide percentage is not, by itself, evidence of a better outcome or greater safety. Match the actual preparation to the trial, including whether it was taken daily for weeks rather than occasionally.
Whole root powder
Root powder and concentrated extracts cannot be compared by weight alone.2
Standardized root extract
Identify the extract and withanolide specification. A root-extract trial only directly supports the preparation and regimen tested.3
Root-and-leaf extract
Read evidence for the actual preparation; root and leaf differ chemically.2
evidence
What the human studies actually tested
Stress ratings, sleep measurements, and hormone concentrations are separate endpoints. Read the preparation and study duration alongside the result.
Can it reduce perceived stress?
Promising short-term evidence; results vary by measure
In a 2019 trial, 60 stressed adults received 240 mg/day of a standardized extract or placebo for 60 days. The anxiety-rating result favored the extract, while the difference on a combined depression, anxiety, and stress scale did not reach conventional statistical significance. Cortisol also fell more with the extract.4
A 2026 trial randomized 135 adults to a sustained-release root extract at 150 mg/day, 300 mg/day, or placebo for 60 days. Stress and sleep scores favored the extracts. Several authors worked for the companies involved with the ingredient or research. These results add evidence for those preparations without establishing benefits for every product or long-term use.5
Can it help insomnia?
Small trials suggest benefit; not a complete insomnia treatment
A 2019 study randomized 60 adults with insomnia in a 2:1 ratio to a particular root extract or placebo for ten weeks. Sleep measures favored the extract. The single-center design, small sample, and short duration limit certainty and generalizability.3
For someone sleeping poorly, the practical question is also what is causing the problem. A supplement trial does not exclude sleep apnea, medication effects, or a need for established insomnia treatment.
Does it “balance hormones”?
That broad claim is not established
In the 2019 stress trial, testosterone rose over time in men taking the extract, but the difference compared with placebo was not statistically significant. That cannot support a promise of testosterone improvement for everyone.4 Changes in thyroid activity are also a potential adverse effect, not proof of beneficial balance.2
amounts
Use study amounts as context
One insomnia trial used 300 mg of a particular root extract twice daily for ten weeks.3 A different stress trial used 240 mg/day of another standardized extract.4 Those numbers should not be converted into a general dosing rule for every product.
Before starting, decide with a clinician whether the intended use is appropriate and how benefit or adverse effects will be assessed. Persisting symptoms may call for evaluation rather than a larger dose or additional calming ingredients.
safety
Natural does not mean suitable for everyone
Avoid ashwagandha during pregnancy and breastfeeding. NCCIH also advises against use with thyroid or autoimmune disorders, before surgery, and in hormone-sensitive prostate cancer. Drowsiness and digestive upset can occur. Potential interactions include sedatives, anticonvulsants, thyroid medication, immunosuppressants, and medicines for blood pressure or diabetes.1
Liver injury has been reported. A 2020 case series described five affected people, including cases assessed through the U.S. Drug-Induced Liver Injury Network. A case series cannot tell us how often injury occurs among all users, but it is a meaningful safety signal.6
Stop the supplement and obtain prompt medical advice for jaundice, dark urine, or other symptoms suggesting liver injury. Disclose the exact product and all other supplements. Do not restart a product suspected of causing liver injury without specialist advice.6
testing
A cortisol result is not a supplement prescription
Some trials measured cortisol while also collecting symptom ratings.45 An individual cortisol result needs context such as time of day and why the test was ordered. These studies do not validate a home algorithm that diagnoses a stress disorder or chooses an ashwagandha dose.
Bring persistent sleep disruption, palpitations, unexplained weight changes, or worsening anxiety to your care team. The herb can affect thyroid physiology; it is not a substitute for evaluating symptoms.2
Questions people ask
Is ashwaganda a different herb?
Usually it is a misspelling of ashwagandha. Check for the botanical name Withania somnifera on the label.1
Is it safe to take indefinitely?
Trials and official summaries mainly cover short use. Safety over many months or years has not been established.1
Can I take it with thyroid medication?
Do not add it without the prescriber’s input. Thyroid effects and interactions are a concern.1
Does one lower cortisol measurement prove it worked?
No. A biochemical change and a meaningful improvement in symptoms are different findings.4
Do results from a branded extract apply to any gummy?
Not automatically. The extract, dose, added ingredients, and duration need to match the evidence you are relying on.3
Keep exploring
Put the information in context.
Bring your food habits, supplement questions, and goals into a conversation with the Nuvitru team.
Explore nutrition care ↗Sources & further reading
Sources support specific statements, not a blanket endorsement of supplementation.
- NIH NCCIH. Ashwagandha: Usefulness and Safety. Official safety summary.
- NIH Office of Dietary Supplements. Ashwagandha: Is it helpful for stress, anxiety, or sleep? Health Professional Fact Sheet.
- Langade D et al. Efficacy and Safety of Ashwagandha Root Extract in Insomnia and Anxiety. Cureus. 2019;11:e5797. Randomized trial.
- Lopresti AL et al. An investigation into the stress-relieving and pharmacological actions of an ashwagandha extract. Medicine. 2019;98:e17186. Randomized trial.
- Efficacy and safety of Ashwagandha root extract sustained-release (AshwaSR) capsules in healthy adult, stressed subjects. 2026. Randomized three-arm trial.
- Björnsson HK et al. Ashwagandha-induced liver injury: A case series from Iceland and the US Drug-Induced Liver Injury Network. Liver International. 2020.