Protocol·Hormonal Balance·Intermediate·Reviewed June 9, 2026
Thyroid Support Protocol.
Supplies the nutrient cofactors the thyroid uses to build and activate its hormones (iodine, selenium, zinc, iron and L-Tyrosine) while supporting peripheral conversion of T4 to T3. Because high-dose iodine can worsen autoimmune (Hashimoto) thyroid disease, this protocol is intended only alongside thyroid testing and clinician guidance, not for blind self-treatment.
The thyroid support protocol in brief.
A quick summary. The full stack, with dose and timing for each supplement, is below.
The Thyroid Support Protocol is an intermediate stack of 7 supplements aimed at hormonal balance: Selenium, Iodine, Zinc, Iron, Vitamin D3, L-Tyrosine, and Ashwagandha. 3 are core and the rest are optional add-ons, at roughly $25-45/mo. Each supplement below lists its dose, timing, role, and the evidence behind it.
What is in the thyroid support protocol.
Dose, timing, role, and evidence tier for each supplement. Core items carry the protocol; optional ones are situational. Open any name for the full profile.
| Supplement | Dose | Timing | Role | Evidence |
|---|---|---|---|---|
| Selenium | 100-200 mcg (as selenomethionine) | Once daily with a meal | Core | Moderate |
| Iodine | 150 mcg (do not exceed 150 mcg without testing and clinician guidance) | Once daily with breakfast | Core | Strong |
| Zinc | 15-25 mg elemental | Once daily with food, separated from iron by about 2 hours | Core | Emerging |
| Iron | 18 mg elemental (only if iron status is low or borderline) | Once daily on an empty stomach or with vitamin C, separated from zinc by about 2 hours and from thyroid medication by about 4 hours | Optional | Moderate |
| Vitamin D3 | 1000-2000 IU | Once daily with the largest fat-containing meal | Optional | Emerging |
| L-Tyrosine | 500-1000 mg | Once daily in the morning on an empty stomach | Optional | Emerging |
| Ashwagandha | 300-600 mg standardized root extract | Once daily with food, or split between morning and evening | Optional | Emerging |
Selenium is a cofactor for glutathione peroxidase and for the iodothyronine deiodinases that convert T4 to active T3, and adequacy helps buffer the thyroid against oxidative stress as iodine intake rises. Keep total daily intake at or below 200 mcg, since chronic intakes above roughly 400 mcg can cause selenosis.
Iodine is the raw substrate the thyroid incorporates into thyroglobulin to build T4 and T3, so adequacy prevents deficiency-driven goiter and low hormone output. CRITICAL: excess intake can trigger or worsen autoimmune (Hashimoto) thyroid disease, so iodine should never be taken blindly and only follows thyroid testing, paired selenium, and clinician supervision.
Zinc contributes to deiodinase activity and to the function of thyroid hormone receptors, and deficiency is associated with impaired conversion of T4 to T3. Keep long-term intake at or below 40 mg total to avoid copper depletion.
Iron is required for thyroid peroxidase, the enzyme that catalyzes thyroid hormone synthesis, so low iron can blunt hormone output and contribute to fatigue. Supplement only when bloodwork shows low or borderline iron, since unneeded iron carries an overload risk.
Vitamin D3 supports immune regulation, and low vitamin D status is observed more often in autoimmune thyroid disease, though a causal benefit of supplementation on thyroid function is not yet established. Dose to maintain sufficiency rather than to chase high levels.
L-Tyrosine is the amino acid backbone that, once iodinated within thyroglobulin, forms the thyroid hormones T4 and T3. Dietary protein normally supplies ample tyrosine, so benefit beyond correcting a frank shortfall is largely theoretical and it is treated as optional support rather than a proven thyroid-boosting agent.
In a small trial Ashwagandha was associated with modest increases in thyroid hormone levels in subclinical hypothyroidism, possibly via stress-axis modulation, but the evidence is preliminary and not confirmed in larger studies. It should be avoided in hyperthyroidism and used cautiously alongside thyroid medication.
How the pieces combine.
The mechanistic rationale for stacking these together rather than taking them in isolation.
- CRITICAL: high-dose iodine can worsen autoimmune (Hashimoto) thyroid disease and should not be taken blindly. Confirm thyroid status (TSH, free T4, and thyroid antibodies) and get clinician sign-off before starting.
- Always pair Iodine with Selenium: adequate selenium helps buffer the thyroid against the oxidative stress that can accompany rising iodine intake.
- Selenium and Iron support different steps of the same pathway: iron supports thyroid peroxidase for hormone synthesis while selenium-dependent deiodinases convert T4 to active T3.
- Separate minerals to protect absorption: take Iron about 2 hours apart from Zinc, and keep Iron about 4 hours away from any thyroid hormone medication.
- If you take levothyroxine or have hyperthyroidism, review Ashwagandha and Iodine with your clinician first, since both can shift thyroid hormone levels and dosing needs.
Cost and commitment.
A rough monthly cost and how involved the protocol is to run.
The evidence behind it.
Overview citations for this protocol. Each supplement's own profile carries its full source list.
- Zimmermann MB et al. Iodine deficiency and thyroid disorders. Lancet Diabetes Endocrinol. 2015;3(4):286-95. PubMed
- Winther KH et al. Selenium in thyroid disorders - essential knowledge for clinicians. Nat Rev Endocrinol. 2020;16(3):165-176. PubMed
- Rayman MP. Multiple nutritional factors and thyroid disease, with particular reference to autoimmune thyroid disease. Proc Nutr Soc. 2019;78(1):34-44. PubMed
Common questions.
Quick answers drawn from the stack above.
What is in the Thyroid Support Protocol?
The Thyroid Support Protocol combines 7 supplements for hormonal balance: Selenium, Iodine, Zinc, Iron, Vitamin D3, L-Tyrosine, and Ashwagandha. 3 are core; the rest are optional.
How much does the Thyroid Support Protocol cost?
NutriStack estimates the Thyroid Support Protocol at about $25-45/mo, depending on the forms and brands you choose and whether you run the optional add-ons.
Is the Thyroid Support Protocol backed by evidence?
Each supplement in the protocol carries its own evidence tier (1 rated strong here) and links to PubMed-cited sources. NutriStack does not rank or score brands and takes no manufacturer payments; this is an informational reference, not medical advice.
Build it in the app
Run the thyroid support protocol in NutriStack.
Add the stack to NutriStack to track timing, screen it for interactions, and see a Stack Score that updates as you tune it.