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Perimenopause is a time of significant hormonal shifts, and for many women, these changes can impact various bodily systems, including the thyroid. Maintaining thyroid health is crucial for overall well-being, as this small gland plays a vital role in metabolism, energy, and mood.
Ashwagandha (Withania somnifera) is an adaptogenic herb that has garnered interest for its potential role in supporting the endocrine system [1]. This article explores the current evidence regarding ashwagandha’s potential effects on thyroid function, particularly in the context of perimenopause and subclinical hypothyroidism.
Understanding Thyroid Function in Perimenopause
The thyroid gland produces hormones, primarily thyroxine (T4) and triiodothyronine (T3), which are essential for regulating metabolism. During perimenopause, hormonal fluctuations can sometimes influence thyroid function, potentially leading to symptoms that may overlap with menopausal changes, such as fatigue, weight fluctuations, and mood shifts.
Subclinical hypothyroidism is a condition where thyroid-stimulating hormone (TSH) levels are mildly elevated, but T4 levels remain within the normal range. While often asymptomatic, some individuals with subclinical hypothyroidism may experience subtle symptoms, and there is interest in supportive approaches to help maintain thyroid balance during this life stage.
Ashwagandha’s Potential Influence on Thyroid Hormones
Research suggests that ashwagandha may have an influence on thyroid hormone levels. One double-blind, randomized, placebo-controlled trial specifically investigated the efficacy and safety of ashwagandha root extract in patients with subclinical hypothyroidism. Participants receiving 600 mg of ashwagandha root extract daily for eight weeks showed a significant improvement in serum TSH, T3, and T4 levels compared to the placebo group [2].
Earlier animal research also indicated that Withania somnifera could play a role in regulating circulating thyroid hormone concentrations [3]. These findings suggest a potential mechanism by which ashwagandha might support thyroid function, though human research specifically on perimenopausal women with subclinical hypothyroidism is still developing.
Ashwagandha and Overall Hormone Balance
Beyond direct thyroid effects, ashwagandha is recognized as an adaptogen, meaning it may help the body adapt to stress and maintain balance [1]. This adaptogenic quality could be relevant during perimenopause, a period often characterized by increased stress and hormonal fluctuations. While direct evidence linking ashwagandha to specific menopausal hormone modulation is emerging [PMID 41561822, PMID 41694897], its broader endocrine system support is a focus of ongoing research [1].
It’s important to differentiate ashwagandha from other herbs sometimes discussed for menopausal symptoms. For example, Shatavari (Asparagus racemosus) has also been studied for menopausal symptoms, but its mechanisms and specific effects on thyroid function are distinct [4]. The focus here remains on ashwagandha’s documented interactions with the thyroid.
Safety Considerations for Ashwagandha
The safety profile of ashwagandha root extract has been evaluated in several studies. A randomized, placebo-controlled study in healthy volunteers found ashwagandha root extract to be generally safe and well-tolerated [5]. Another prospective, observational study examined the safety of 12-months administration of a standardized ashwagandha root extract in healthy adults, also indicating a generally favorable safety profile [6].
However, it is important to be aware of potential interactions and specific contraindications. For instance, ashwagandha’s potential influence on thyroid hormones means it might interact with thyroid medications. There is also research exploring its potential teratogenic and abortifacient potentials, which is a critical consideration for women who are pregnant or trying to conceive [7].
While generally considered safe for many, anyone with pre-existing thyroid conditions, or those taking thyroid medications, should consult with a healthcare provider before considering ashwagandha. This is crucial to ensure appropriate monitoring and to avoid potential adverse effects or interactions.
References
- Can Ashwagandha Benefit the Endocrine System?-A Review. International journal of molecular sciences, 2023
- Efficacy and Safety of Ashwagandha Root Extract in Subclinical Hypothyroid Patients: A Double-Blind, Randomized Placebo-Controlled Trial. Journal of alternative and complementary medicine (New York, N.Y.), 2018
- Withania somnifera and Bauhinia purpurea in the regulation of circulating thyroid hormone concentrations in female mice. Journal of ethnopharmacology, 1999
- Efficacy and safety of Shatavari root extract (Asparagus racemosus) for menopausal symptoms: a randomized, double-blind, three-arm, placebo-controlled study. Frontiers in reproductive health, 2025
- Safety of Ashwagandha Root Extract: A Randomized, Placebo-Controlled, study in Healthy Volunteers. Complementary therapies in medicine, 2021
- Safety of 12-Months Administration of Ashwagandha (Withania somnifera) Standardized Root Extract in Healthy Adults: A Prospective, Observational Study. Phytotherapy research : PTR, 2025
- A Systematic and Ethnobotanical Review of Ashwagandha’s (Withania Somnifera) Teratogenic and Abortifacient Potentials. Phytotherapy research : PTR, 2025
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.
