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Supplements/Herb

Ashwagandha (Thyroid Support)

Supports T4→T3 conversion in subclinical hypothyroid adults.

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Thyroid SupportHormone OptimizationCortisol Management

Overview

Supports T4→T3 conversion in subclinical hypothyroid adults.

Natural sources
  • Whole dried plant material (root, leaf, flower, or aerial parts depending on the species)
  • Standardized hydroethanolic or aqueous extract (capsule, tincture, or tea)
  • Powdered traditional preparation used in Ayurvedic, TCM, or Western herbal practice
Common forms
  • Standardized extract capsule
  • Liquid tincture (alcohol or glycerin)
  • Powdered whole herb
  • Traditional decoction or tea

Mechanism of action

Adaptogenic action on HPA-HPT axis; may upregulate type 1 deiodinase.

Pathways
  • · Adaptogenic action on HPA-HPT axis
  • · may upregulate type 1 deiodinase

Effects on the body

Supports
Raised T4 and T3 in subclinical hypothyroidism (Sharma 2018)

Organ system effects

Brain & CNS

Ashwagandha (Thyroid Support) modulates HPA-axis output and downstream stress-response signaling.

Evidence-based benefits

Raised T4 and T3 in subclinical hypothyroidism (Sharma 2018)

Limited evidence

Potential side effects

Common
    Rare
      Serious
      • · Hyperthyroidism worsening — caution

      Drug interactions

      Thyroid hormone replacement
      Monitor TSH.
      moderate

      Safety & non-supplemental interactions

      Educational summary — always confirm with your clinician or pharmacist before starting, stopping, or combining with prescription therapy.

      Avoid if you are
      • ·Pregnant or breastfeeding (insufficient safety data)
      • ·Children under 18 (unless directed by a clinician)
      Avoid / monitor with these medications
      • ·Alcohol, benzodiazepines, opioids, sedating antihistamines (additive CNS depression)

      Supplement interactions

      Pairs well with
      • Ashwagandha
        Adaptogenic HPA-axis modulation.
      • L-theanine
        Promotes calm focus without sedation.
      Avoid combining with

      No specific avoidances listed.

      Dosing & bioavailability

      Typical dose
      300–600 mg KSM-66 BID
      Best form
      Most evidence is based on the standardized extract capsule form.
      Timing
      Consistent daily timing recommended; split larger doses if GI tolerance is a concern.
      With food?
      Optional

      Where to buy

      Affiliate links — we may earn a commission at no extra cost to you. Amazon code supplementsch-20 is auto-applied at checkout. We don't endorse specific brands; verify third-party testing (USP, NSF, Informed Sport) before purchase.

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      Scientific evidence8Show studies
      RCTJ Altern Complement Med · 2018

      Ashwagandha in subclinical hypothyroidism

      Sharma AK, et al.

      8-week RCT of ashwagandha 600 mg/d.

      Key findings

      Normalized TSH, T3, and T4 vs placebo.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Ashwagandha (Thyroid Support) — Raised T4 and T3 in subclinical hypothyroidism

      Live PubMed search

      Live results for "Ashwagandha (Thyroid Support) Raised T4 and T3 in subclinical hypothyroidism" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Ashwagandha (Thyroid Support) and "Raised T4 and T3 in subclinical hypothyroidism". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Ashwagandha (Thyroid Support) — randomized controlled trial

      Live PubMed search

      Live results for "Ashwagandha (Thyroid Support) randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Ashwagandha (Thyroid Support) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Ashwagandha (Thyroid Support) — meta-analysis

      Live PubMed search

      Live results for "Ashwagandha (Thyroid Support) meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Ashwagandha (Thyroid Support) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Ashwagandha (Thyroid Support) — pharmacokinetics

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      Live results for "Ashwagandha (Thyroid Support) pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Ashwagandha (Thyroid Support) and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Ashwagandha (Thyroid Support) — safety adverse events

      Live PubMed search

      Live results for "Ashwagandha (Thyroid Support) safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Ashwagandha (Thyroid Support) and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Ashwagandha (Thyroid Support) — dose response

      Live PubMed search

      Live results for "Ashwagandha (Thyroid Support) dose response" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Ashwagandha (Thyroid Support) and "dose response". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewGoogle Scholar · 1970

      Google Scholar: Ashwagandha (Thyroid Support) — clinical evidence

      Live Scholar search

      Cross-database citation index for Ashwagandha (Thyroid Support) as it relates to "clinical evidence".

      Key findings

      Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

      Open study
      Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.

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