Evidence supporting the use of: Ashwagandha
For the body system: Thyroid Gland

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Ashwagandha (Withania somnifera) has traditional roots in Ayurvedic medicine, where it has been used as a general tonic and adaptogen. More recently, scientific research has explored its effects on thyroid function. Several small clinical studies and animal experiments suggest that ashwagandha may help support thyroid health, particularly in cases of hypothyroidism (underactive thyroid). For example, a double-blind, placebo-controlled study published in the Journal of Alternative and Complementary Medicine (2018) found that ashwagandha root extract (600 mg/day for 8 weeks) significantly improved serum TSH, T3, and T4 levels in patients with subclinical hypothyroidism compared to placebo. Animal studies have also shown that ashwagandha can increase thyroid hormone levels and may stimulate thyroidal activity. The proposed mechanisms include antioxidant effects and modulation of the hypothalamic-pituitary-thyroid axis.

However, the number of high-quality human trials is limited, and most studies have small sample sizes. There is not enough evidence to support its use for hyperthyroidism (overactive thyroid). While the initial results are promising, more large-scale, long-term studies are needed to confirm efficacy and safety in various thyroid conditions. Overall, the use of ashwagandha for supporting the thyroid is supported by both traditional use and emerging scientific evidence, but the strength of the scientific validation is moderate at present.

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