Thyroid Support — Hashimoto's
About this protocol
Where to start
Start with selenium. The most-evidenced supplement for Hashimoto''s — multiple trials show 30-40% reduction in TPO antibody levels over 3-6 months. Cap at 200 mcg/day — higher doses are toxic.
Add vitamin D3 if your 25-OH vitamin D is under 30 ng/mL. Hashimoto''s patients are commonly deficient and supplementation reduces antibody levels.
Add myo-inositol (paired with selenium). Trial evidence in subclinical hypothyroidism + positive TPO antibodies shows TSH reduction and thyroid function improvement.
Add zinc at standard doses if dietary intake is low. Required for T4-to-T3 conversion.
Add ashwagandha ONLY if cleared by your endocrinologist. It mildly increases T4 and T3 — useful in some Hashimoto''s patients with low-normal thyroid hormones, dangerous in others.
Avoid iodine supplementation in Hashimoto''s — paradoxically worsens autoimmune destruction in many patients. This is a common misconception.
Get TPO antibodies, free T4, free T3, TSH, and reverse T3 retested every 3-6 months when actively intervening.
5 nutrients
Start here
Strongest evidence — the foundation of the stack.
Selenium (Selenomethionine)
200 mcg daily, with breakfastSelenium is the most-evidenced supplement for Hashimoto''s. Multiple randomized trials and meta-analyses (including a 2024 network meta-analysis of 35 RCTs) show 30-40% reductions in TPO antibody levels over 3-6 months at 200 mcg/day. Selenomethionine is the most-studied form. Cap at 200 mcg — higher doses are toxic and produce selenosis (hair loss, brittle nails, garlic breath).[1, 2, 3]
Vitamin D3
2000-5000 IU daily, with breakfast — target serum 40-60 ng/mLHashimoto''s patients are commonly vitamin D-deficient. Supplementation to replete levels reduces TPO antibody levels and may slow disease progression. Target a higher 25-OH range (40-60 ng/mL) than the general population. Fat-soluble; take with food.[4, 5, 6]
Add if needed
Add these only if the foundation isn't enough.
Myo-Inositol (with Selenium)
600 mg myo-inositol + 83 mcg selenium dailyThe combination of myo-inositol and selenium has trial evidence for subclinical hypothyroidism with positive TPO antibodies — TSH reduction and improvements in thyroid function over 6 months. Myo-inositol supports TSH receptor function.[7, 8, 9]
Experimental
Emerging evidence — try last, only if curious.
Ashwagandha (KSM-66) — only if endo-cleared
600 mg daily — ONLY with endocrinologist approvalAshwagandha mildly increases T4 and T3 in trials. This is helpful in some Hashimoto''s patients with low-normal thyroid hormones and damaging in others (hyperthyroidism risk, particularly post-levothyroxine adjustment). Only use with explicit endocrinologist approval and lab monitoring. Strongly contraindicated in hyperthyroidism or Graves'' disease.[12, 13]
Warnings
Lifestyle improvements
Iodine: do NOT self-supplement in Hashimoto''s
This is the most common dangerous misconception. Iodine supplementation worsens autoimmune destruction in many Hashimoto''s patients. Adequate dietary iodine (one daily serving of seafood, dairy, or iodized salt) is fine. Supplemental iodine without endo oversight is a known hazard.
Reduce inflammatory triggers
Hashimoto''s is autoimmune. Trial evidence supports gluten reduction in some patients (especially those with celiac antibodies — rule out first). Ultra-processed food reduction, omega-6 reduction, and adequate sleep all reduce autoimmune flares.
Manage stress
Hashimoto''s flares correlate with stress events in many patients. Chronic cortisol elevation modulates immune function. The Daily Calm and Anxiety Relief protocols pair naturally.
Sleep 7-9 hours
Autoimmune diseases are exquisitely sleep-sensitive. Sleep deprivation amplifies immune dysfunction.
Exercise moderately
Excessive endurance exercise can flare Hashimoto''s; chronic inactivity worsens metabolic symptoms. Aim for moderate aerobic activity plus 2-3 strength sessions.
Get the right labs, not just TSH
TSH alone is insufficient. Track free T4, free T3, reverse T3, TPO antibodies, thyroglobulin antibodies, and 25-OH vitamin D every 3-6 months. Many endocrinologists only order TSH — politely request the full panel.
Limit alcohol
Alcohol is hepatotoxic and worsens autoimmune activity in many patients.
Find a thyroid-aware provider
Many primary care doctors and general endocrinologists under-treat Hashimoto''s. Look for an endocrinologist or integrative medicine doctor with explicit thyroid focus.
References
- Selenium — supplement research overviewExamine.com link
- Wichman J, et al. Selenium supplementation significantly reduces thyroid autoantibody levels in patients with chronic autoimmune thyroiditis: a systematic review and meta-analysis. Thyroid. 2016;26(12):1681-1692.PubMed link
- Huwiler VV, et al. Selenium Supplementation in Patients with Hashimoto Thyroiditis: A Systematic Review and Meta-Analysis of Randomized Clinical Trials. Thyroid. 2024;34(3):295-313.PubMed link
- Vitamin D — supplement research overviewExamine.com link
- Krysiak R, et al. The Effect of Vitamin D on Thyroid Autoimmunity in Levothyroxine-Treated Women with Hashimoto''s Thyroiditis. Exp Clin Endocrinol Diabetes. 2017;125(4):229-233.PubMed link
- Wang J, et al. Meta-analysis of the association between vitamin D and autoimmune thyroid disease. Nutrients. 2015;7(4):2485-2498.PubMed link
- Inositol — supplement research overviewExamine.com link
- Nordio M, Basciani S. Treatment with myo-inositol and selenium ensures euthyroidism in patients with autoimmune thyroiditis. Int J Endocrinol. 2017;2017:2549491.PubMed link
- Ferrari SM, et al. Myo-inositol and selenium reduce the risk of developing overt hypothyroidism in patients with autoimmune thyroiditis. Eur Rev Med Pharmacol Sci. 2017;21(2 Suppl):36-42.PubMed link
- Zinc — supplement research overviewExamine.com link
- Betsy A, et al. Zinc deficiency associated with hypothyroidism: an overlooked cause of severe alopecia. Int J Trichology. 2013;5(1):40-42.PubMed link
- Ashwagandha — supplement research overviewExamine.com link
- Sharma AK, et al. 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.PubMed link
Related protocols
Other thyroid protocols and protocols sharing ingredients with this one.
Thyroid Foundation (Hypo)
thyroid
Hypothyroidism — outside of autoimmune Hashimoto''s — is most commonly due to iodine deficiency in some populations, selenium deficiency, or post-medical causes (radiation, surgery, medication-induced). In iodine-replete countries, autoimmune Hashimoto''s accounts for the majority of cases (see the Hashimoto''s protocol). This protocol is for non-autoimmune hypothyroidism or subclinical hypothyroidism without elevated TPO antibodies — selenium, low-dose iodine (only if deficiency is documented), tyrosine (precursor to thyroid hormones), and B12 for the fatigue often accompanying hypothyroidism. If you have confirmed Hashimoto''s (positive TPO antibodies), use that protocol instead — iodine supplementation is potentially harmful in autoimmune thyroid disease. Treatment of confirmed hypothyroidism is levothyroxine. Supplements do not replace thyroid hormone replacement. They support endogenous function and address common cofactor deficiencies.
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general· 2 shared ingredients
The decade between 30 and 50 is when men start to drift from "automatic health" into actively maintained health. Testosterone declines ~1% per year starting around 30, cardiovascular risk markers begin shifting, lean muscle mass starts to decrease without active training, and small recovery imbalances accumulate. This protocol is the everyday foundation specifically calibrated for men in this window: vitamin D, magnesium, omega-3, zinc, and CoQ10. Each addresses a relevant pathway — testosterone synthesis, cardiovascular protection, sleep and stress, mitochondrial energy. Layer goal-specific protocols (Testosterone Support, Foundational Longevity, Joint Health) on top of this baseline as needed.
Daily Immune Foundation
immunity· 2 shared ingredients
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Women's Libido & Desire
hormones· 2 shared ingredients
Female sexual desire is multifactorial — hormonal status (estrogen, testosterone, progesterone, thyroid), relationship dynamics, mental health, stress, sleep, medication side effects (especially SSRIs and oral contraceptives), and physical comfort all matter, often more than any single supplement. Hypoactive Sexual Desire Disorder (HSDD) affects roughly 1 in 10 women, and the most common drivers in our culture are chronic stress, sleep debt, medication side effects, and relational rather than biochemical factors. Supplements address one slice of the picture and are not a substitute for proper medical evaluation when desire loss is severe or distressing. That said, a handful of supplements have real trial evidence in women specifically — not extrapolated from male data. Maca has the most consistent evidence for libido and desire in both pre- and postmenopausal women, with effects that appear independent of hormonal change. Ashwagandha shows benefit on female sexual function through stress modulation. Vitamin D and zinc are deficiency-correction nutrients — if you''re low, repletion helps; if you''re replete, additional supplementation does nothing. L-citrulline has indirect support for genital blood flow. Most women''s libido issues are NOT supplement-deficiency problems, but for the subset where they are, this stack is well-targeted.
Andropause / Men 50+
hormones· 2 shared ingredients
Andropause — formally late-onset hypogonadism — is real but gradual. Total testosterone declines roughly 1% per year after age 30, and symptoms (lower libido, erectile changes, mood and energy decline, muscle loss, visceral fat gain, occasional hot flashes) accumulate slowly across the 40s and 50s. Unlike menopause, there is no clean inflection point — which is exactly why it is often missed or attributed to "just aging." The first step is honest measurement: morning total + free testosterone, SHBG, LH, FSH, estradiol, PSA, lipids, fasting glucose, CBC. Numbers and symptoms together drive the decision tree. For properly-indicated men, testosterone replacement therapy (TRT) is genuinely transformative — and supplements cannot replicate it. This protocol is for the broader 50+ male wellness picture: milder cases of declining T, men who don't yet meet TRT criteria, or men using supplements as an adjunct to lifestyle work before pursuing prescription routes. Effect sizes from supplements are modest and only meaningful when sleep, strength training, body composition, and alcohol intake are already in order.
Men's Fertility / Sperm Health
maternal· 2 shared ingredients
Up to 50% of infertility cases involve a male factor — yet most fertility workups focus disproportionately on the female partner. The 90 days before conception matter for men too: spermatogenesis takes 72-74 days, so the nutritional and lifestyle environment during that window directly affects sperm count, motility, morphology, and DNA fragmentation. The supplement category here has unusually clear evidence: CoQ10 (ubiquinol) for motility and count, zinc for foundational spermatogenesis, L-carnitine for motility specifically, selenium for sperm glutathione peroxidase activity, and ashwagandha for testosterone + sperm parameters. Effect sizes are real and replicated in multiple trials. If you''ve been trying to conceive for 12+ months (or 6+ months if your partner is 35+) without success, get a semen analysis — it''s cheap, fast, and informative. Don''t default to assuming the issue is female-only.
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Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This protocol is educational, not a substitute for personalized medical advice. Talk to your doctor before starting any new supplement regimen — especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition. Last updated 5/20/2026.