Adaptogens for Thyroid and "Hormone Balance": Claims Checked
Claims that adaptogens balance thyroid or other hormones, checked against trials and case reports of ashwagandha, with plain cautions for people with thyroid conditions or thyroid medicine.
Content last updated . This page has not been medically reviewed.
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> Thyroid condition or thyroid medicine? NIH advises against ashwagandha for people with thyroid disorders and says it might interact with thyroid hormone medicines. [1] Ask the prescriber or pharmacist before adding any adaptogen. This page does not advise anyone to stop a prescribed medicine.
The claim as it is marketed
Labels say that adaptogens "balance hormones," "support the thyroid" or "heal the adrenals." Those phrases are not measurements. This page asks what research measured, using Withania somnifera (ashwagandha) root extracts, which have the most thyroid-related research in the sources we read.Plain definitions
The thyroid is a small gland in the neck. Hypothyroidism (underactive thyroid) is when it does not make enough thyroid hormone for the body's needs. [2] Hyperthyroidism (overactive thyroid) is when it makes more than the body needs. [3] Hypothyroidism is treated by replacing the missing hormone with the medicine levothyroxine. [2] Symptoms such as fatigue and weight gain are common and do not necessarily mean a thyroid problem. [2] For everyday guidance see thyroid problems and fatigue.What research found
| Question | What the source found | Strength of evidence |
|---|---|---|
| Does ashwagandha change hormone levels in general? | A 2026 meta-analysis of 23 randomized trials (1,706 adults) found lower cortisol, no effect on TSH or T3, a modest rise in T4, higher testosterone in men but not women, and no effect on estradiol; the authors noted heterogeneity and limited data. [4] | Mixed (biomarker results; varied products) |
| Does ashwagandha help subclinical hypothyroidism? | A pilot trial of 50 adults with mildly raised TSH reported better TSH, T3 and T4 versus placebo after 8 weeks of root extract. [5] | Promising but limited (pilot, single center, short) |
| Does it affect thyroid tests in people with bipolar disorder? | A safety side-analysis of a trial found T4 rose in a few treated people, and the authors said vigilance about hyperthyroidism may be warranted; they noted limits such as unequal group sizes. [6] | Insufficient evidence |
| Can it cause too much thyroid hormone? | Case reports describe a 73-year-old woman with a fast heart rhythm and low TSH after two years of use for hypothyroidism, and a 47-year-old man with painless thyroiditis; each improved after the supplement was stopped. [7][8] | Evidence of harm in rare reports (cases, not rates) |
| Do other adaptogens affect the thyroid? | Proper evidence not found. We read the NIH pages for rhodiola, Asian ginseng and astragalus; none described thyroid findings. [9][10][11] | Insufficient evidence |
The two thyroid-focused ashwagandha reports point in different directions: one pilot reports improved thyroid tests in mild underactivity, while case reports describe overactivity. The sources do not settle which applies to a given person, which is why a clinician who knows your test results should decide.
What about "adrenal" and "hormone balance"?
The Endocrine Society says no scientific proof exists to support adrenal fatigue as a true medical condition, that tests for it are not based on good scientific studies, and that persistent tiredness may have other causes such as adrenal insufficiency, depression or sleep apnea. [12] See adrenal fatigue and adrenal support claims. The sources we read do not define "hormone balance" as a measurable outcome.Limits
- NIH says there is not enough information to reach conclusions about long-term safety, and many studies were small and used a variety of preparations. [1]
- Cortisol and thyroid hormones are lab markers. A better number does not show better health.
- Results are for ashwagandha root extracts and should not be applied to leaf, other species or blends.
Frequently asked questions
Does ashwagandha "balance" thyroid hormones?
Studies measured different things: one pilot reported improved TSH, T3 and T4 in mild underactivity, a meta-analysis found no effect on TSH or T3 and a modest T4 rise, and case reports describe overactivity. [5][4][7]
Is ashwagandha safe with levothyroxine?
NIH says ashwagandha might interact with thyroid hormone medicines and is not recommended for people with thyroid disorders. Ask the prescriber or pharmacist. [1]
Can an adaptogen cause hyperthyroidism?
Case reports describe thyrotoxicosis after ashwagandha use, but case reports cannot show how common this is. [7][8]
Do adaptogens lower cortisol?
In a 2026 meta-analysis ashwagandha lowered cortisol versus placebo, but cortisol is a lab marker and trials differed. [4]
What should I do if I think I have a thyroid or adrenal problem?
See a clinician for tests; the Endocrine Society says "adrenal fatigue" tests are not scientifically supported, and symptoms like tiredness have many causes. [12]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety checklist for people with thyroid conditions
- Tell your clinician about any adaptogen, because thyroid blood tests and doses of thyroid medicine are adjusted from your results. See supplements and thyroid medicines and adaptogens and thyroid conditions.
- NIH also lists autoimmune disorders, upcoming surgery, pregnancy and breastfeeding among reasons to avoid ashwagandha. [1]
- A fast heart rhythm or unexplained weight loss after starting a product is a reason to contact a clinician; the case reports above described such symptoms. [7][8]
References
- Ashwagandha: Usefulness and Safety (NCCIH, NIH; last updated March 2023). Read 2026-10-23.
- Hypothyroidism (NIDDK, NIH). Read 2026-10-23.
- Hyperthyroidism (NIDDK, NIH). Read 2026-10-23.
- Hormonal Modulation with Withania somnifera: systematic review and meta-analysis of randomized controlled trials, Planta Medica 2026 (PubMed 41740946). Read 2026-10-23.
- Efficacy and Safety of Ashwagandha Root Extract in Subclinical Hypothyroid Patients, J Altern Complement Med 2018 (PubMed 28829155). Read 2026-10-23.
- Subtle changes in thyroid indices during a placebo-controlled study of Withania somnifera in bipolar disorder, J Ayurveda Integr Med 2014 (PubMed 25624699). Read 2026-10-23.
- Ashwagandha as a Unique Cause of Thyrotoxicosis Presenting With Supraventricular Tachycardia (case report), Cureus 2022 (PubMed 35475098). Read 2026-10-23.
- Painless Thyroiditis by Withania somnifera (Ashwagandha) (case report), Cureus 2024 (PubMed 38559552). Read 2026-10-23.
- Rhodiola: Usefulness and Safety (NCCIH, NIH). Read 2026-10-23.
- Asian Ginseng: Usefulness and Safety (NCCIH, NIH). Read 2026-10-23.
- Astragalus: Usefulness and Safety (NCCIH, NIH). Read 2026-10-23.
- Adrenal Fatigue (Endocrine Society patient resource, January 2022). Read 2026-10-23.