NutriStack
Ashwagandha and Liothyronine, a caution.
Ashwagandha may increase thyroid hormone activity or trigger thyrotoxicosis in susceptible people. Liothyronine is active T3 and can cause symptoms quickly if the total thyroid hormone effect becomes too high. Combining the two may increase the chance of palpitations, tremor, anxiety, insomnia, or heat intolerance.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Ashwagandha and Liothyronine
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. Ashwagandha may increase thyroid hormone activity or trigger thyrotoxicosis in susceptible people. Liothyronine is active T3 and can cause symptoms quickly if the total thyroid hormone effect becomes too high. Combining the two may increase the chance of palpitations, tremor, anxiety, insomnia, or heat intolerance.
Mechanism. Ashwagandha has been linked to changes in TSH, T3, and T4 and rare thyrotoxicosis. Because liothyronine is pharmacologically active T3, any supplement-related increase in thyroid hormone effect can be additive.
Recommendation. Avoid ashwagandha unless your prescriber knows you are taking liothyronine. If you start or stop ashwagandha, monitor thyroid labs and symptoms closely because liothyronine dose changes may be needed.
Sources (2)
- van der Hooft CS, Hoekstra A, Winter A, de Smet PA. Thyrotoxicosis following the use of ashwagandha. Ned Tijdschr Geneeskd. 2005;149(47):2637-2638. PMID 16355578
- Sharma AK, Basu I, Singh S. Efficacy and Safety of Ashwagandha Root Extract in Subclinical Hypothyroid Patients: A Double-Blind, Randomized Placebo-Controlled Trial. J Altern Complement Med. 2018;24(3):243-248. PMID 28829155
Stack Score
How this pair moves the number.
Effect on the composite score
If both Ashwagandha and Liothyronine are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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