NutriStack
Symptom·Hormone·Reviewed May 30, 2026
Supplements for Sluggish thyroid / cold intolerance.
When sluggish thyroid / cold intolerance is the complaint, these are the supplements most often associated with it in the NutriStack library, ranked by how directly each one targets it and by the strength of the evidence.
Ranked by relevance, top first.
Relevance reflects how directly each supplement targets this symptom in the NutriStack map. Evidence is the supplement’s own rating. Open any name for the full profile.
- 01SeleniumModerate84% match
Selenium is essential for the deiodinase enzymes that convert T4 to active T3 and for glutathione peroxidase that protects the thyroid from oxidative damage.
SuggestedSelenomethionine - 02IodineStrong80% match
Iodine is the substrate for thyroid hormone synthesis, and deficiency directly impairs T4 and T3 production.
SuggestedPotassium iodide (modest dose) - 03IronModerate70% match
Iron is a cofactor for thyroid peroxidase, so deficiency can impair hormone synthesis and blunt the response to thyroid treatment.
SuggestedFerrous bisglycinate - 04ZincLimited64% match
Zinc supports thyroid hormone synthesis and peripheral T4 to T3 conversion, and deficiency can contribute to low thyroid function.
SuggestedZinc picolinate or bisglycinate - 05L-TyrosineLimited60% match
Tyrosine is the amino acid backbone combined with iodine to form thyroid hormone, though supplementation does not reliably raise output when intake is already adequate.
SuggestedL-tyrosine (away from meals) - 06Vitamin D3Limited57% match
Vitamin D modulates immune function and is often low in autoimmune thyroid disease, though a direct causal role in thyroid output is not established.
SuggestedVitamin D3 (cholecalciferol) - 07AshwagandhaLimited56% match
Adaptogenic effects on the HPA axis may modestly raise thyroid hormone levels in subclinical hypothyroidism in small studies.
SuggestedStandardized ashwagandha root extract (KSM-66)
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These rankings come from the same library that powers the NutriStack app. Open any supplement for full dosing, forms, interactions, and citations.