Thyroid Foundation (Hypo)
About this protocol
Where to start
Get the right labs first: TSH, free T4, free T3, TPO antibodies, thyroglobulin antibodies, and a urinary iodine spot or 24-hour test if iodine status is uncertain. Distinguish autoimmune (positive antibodies — use Hashimoto''s protocol) from non-autoimmune hypothyroidism.
Start with selenium. Supports T4-to-T3 conversion and overall thyroid function. Cap at 200 mcg/day.
Iodine — only if documented deficient. Urinary iodine under 100 mcg/L indicates deficiency. Use low-dose (150-200 mcg/day) for replete diets, or moderate dose (300-500 mcg/day) for documented deficiency. NEVER supplement iodine in Hashimoto''s.
L-tyrosine is the amino acid precursor to T4. Useful when low-normal thyroid hormones cause fatigue and cognitive dullness. Activating; morning only.
B12 (methylcobalamin) for the fatigue and cognitive symptoms that accompany hypothyroidism. Coexistent B12 deficiency is common.
If your TSH is over 4.5 mIU/L or you have hypothyroid symptoms, see your doctor about levothyroxine. Supplements support; they do not replace medical management of confirmed hypothyroidism.
4 nutrients
Start here
Strongest evidence — the foundation of the stack.
Selenium (Selenomethionine)
100-200 mcg daily, with breakfastSelenium is essential for T4-to-T3 conversion via the deiodinase enzymes. Adequate selenium status improves thyroid function in deficient individuals. Most diets meet RDA from foods (Brazil nuts, fish, eggs) but supplementation is reasonable insurance. Cap at 200 mcg/day — higher doses are toxic.[1, 2]
Iodine (low-dose, only if deficient)
150-300 mcg daily — TEST FIRST, AVOID IF HASHIMOTO''SIodine is the rate-limiting substrate for thyroid hormone synthesis. In iodine-deficient populations, supplementation reverses hypothyroidism. In iodine-replete diets (Western populations using iodized salt, dairy, or seafood), supplementation is usually unnecessary. CRITICAL: iodine supplementation can worsen Hashimoto''s autoimmune destruction — test TPO antibodies first.[3, 4]
Add if needed
Add these only if the foundation isn't enough.
L-Tyrosine
500-1000 mg morning, on empty stomachL-tyrosine is the amino acid precursor to thyroid hormones T4 and T3. Useful for the fatigue and cognitive symptoms accompanying low-normal thyroid function. Activating; morning only. Modest evidence; effect is augmented when paired with adequate selenium and iodine.[5, 6]
Vitamin B12 (Methylcobalamin)
1000 mcg daily, with breakfastB12 deficiency commonly accompanies hypothyroidism and amplifies fatigue and cognitive symptoms. Methylcobalamin bypasses methylation steps and is preferable to cyanocobalamin. Many hypothyroid patients feel better when B12 levels are optimized to the upper half of the reference range.[7, 8]
Warnings
Lifestyle improvements
Distinguish autoimmune vs. non-autoimmune hypothyroidism
Test TPO antibodies before assuming iodine deficiency. Positive antibodies = Hashimoto''s = use that protocol, AVOID iodine. Negative antibodies + low T4 = consider iodine and selenium.
Get the right labs, not just TSH
TSH alone is insufficient. Full panel: TSH, free T4, free T3, reverse T3, TPO antibodies, thyroglobulin antibodies, urinary iodine if status is uncertain.
Adequate dietary iodine without mega-dosing
One daily serving of seafood, dairy, eggs, or iodized salt covers adequate iodine for most adults. Don''t mega-dose — both excess and deficiency cause thyroid dysfunction.
Reduce goitrogens during raw consumption
Cruciferous vegetables (broccoli, kale, cabbage) and soy contain goitrogens that interfere with iodine uptake when consumed raw in very large quantities. Cooking deactivates them. The "avoid cruciferous if thyroid" advice is overstated — moderate cooked intake is fine.
Sleep 7-9 hours
Hypothyroid symptoms are amplified by sleep deprivation.
Manage stress
Chronic cortisol elevation suppresses TSH and T4-to-T3 conversion.
Annual labs
TSH, free T4, free T3 yearly if you''re asymptomatic. Every 3-6 months when actively intervening or adjusting thyroid medications.
Find a thyroid-aware provider
Many primary care doctors only order TSH and miss subclinical issues. Look for an endocrinologist or integrative medicine doctor with explicit thyroid focus.
References
- Selenium — supplement research overviewExamine.com link
- Ventura M, et al. Selenium and Thyroid Disease: From Pathophysiology to Treatment. Int J Endocrinol. 2017;2017:1297658.PubMed link
- Iodine — supplement research overviewExamine.com link
- Leung AM, Braverman LE. Consequences of excess iodine. Nat Rev Endocrinol. 2014;10(3):136-142.PubMed link
- L-Tyrosine — supplement research overviewExamine.com link
- Jongkees BJ, et al. Effect of tyrosine supplementation on clinical and healthy populations under stress or cognitive demands. J Psychiatr Res. 2015;70:50-57.PubMed link
- Vitamin B12 — supplement research overviewExamine.com link
- Jabbar A, et al. Vitamin B12 deficiency common in primary hypothyroidism. J Pak Med Assoc. 2008;58(5):258-261.PubMed link
Related protocols
Other thyroid protocols and protocols sharing ingredients with this one.
Thyroid Support — Hashimoto's
thyroid
Hashimoto''s thyroiditis is the most common cause of hypothyroidism in iodine-replete countries — autoimmune destruction of thyroid tissue driving elevated TPO antibodies and eventual hypothyroid state. Treatment of confirmed hypothyroidism is levothyroxine; supplements DO NOT replace thyroid hormone replacement. They CAN reduce TPO antibody levels, support thyroid function in early/subclinical Hashimoto''s, and address common cofactor deficiencies that worsen disease progression. The strongest evidence in the supplement category is for selenium (Grade A in recent meta-analyses for TPO antibody reduction), vitamin D3 (Grade B), and the combination of myo-inositol + selenium (Grade B). If you have a confirmed Hashimoto''s diagnosis, this stack complements your endocrinologist''s management, doesn''t replace it. If you suspect Hashimoto''s, get TSH, free T4, free T3, TPO antibodies, and thyroglobulin antibodies before starting.
Metformin Companion
medication· 1 shared ingredient
Metformin is the most-prescribed type 2 diabetes medication and is increasingly used off-label for prediabetes, PCOS, and even longevity research. The catch: long-term metformin use is associated with vitamin B12 deficiency in 5-30% of users — the exact mechanism involves reduced B12 absorption in the small intestine. B12 deficiency on metformin develops slowly (typically 4+ years of use) and produces fatigue, cognitive symptoms, and peripheral neuropathy — symptoms commonly misattributed to diabetes itself. Metformin also modestly affects folate and CoQ10, and magnesium supplementation may enhance metformin''s metabolic effects. This protocol is for adults ACTIVELY on metformin (any indication: T2DM, prediabetes, PCOS, or off-label use). CRITICAL: this protocol does NOT replace metformin. The supplements address downstream nutritional effects. The American Diabetes Association recommends periodic B12 testing for long-term metformin users — particularly in adults over 50, vegetarians/vegans, and those with neurological symptoms. Don''t skip B12 monitoring.
Brain Fog Recovery
focus· 1 shared ingredient
"Brain fog" — difficulty concentrating, slow word retrieval, sluggish thinking, mental fatigue — exploded as a search term post-2020 with Long COVID and persistent post-viral cognitive symptoms. It''s also common in perimenopause, chronic stress, ADHD, post-COVID recovery, fibromyalgia, ME/CFS, and after periods of severe sleep deprivation. The underlying mechanisms typically involve some combination of neuroinflammation, mitochondrial dysfunction, neurotransmitter dysregulation, and disrupted cerebral blood flow. This stack targets these pathways: lion''s mane for nerve growth factor support, citicoline for acetylcholine and membrane phospholipid synthesis, B12 for methylation and neurological function, omega-3 DHA for neuronal membrane structure, and CoQ10 for mitochondrial energy in neurons. If your brain fog is severe, sudden, or follows a specific trigger (infection, head injury, new medication), see your doctor — workup matters. Long COVID specifically has emerging treatment protocols; you don''t have to white-knuckle it.
PPI / Acid Blocker Companion
medication· 1 shared ingredient
Proton pump inhibitors (omeprazole/Prilosec, esomeprazole/Nexium, pantoprazole/Protonix, lansoprazole/Prevacid) are among the most-prescribed medications globally — and frequently used much longer than recommended. Long-term PPI use (more than 6-12 months) is associated with multiple documented nutrient malabsorption issues because stomach acid is REQUIRED for absorbing B12, calcium, iron, magnesium, and zinc. Reduced stomach acid also alters the gut microbiome, increases risk of C. difficile and pneumonia infections, and is associated (though not necessarily causal) with osteoporotic fractures, dementia, and kidney issues in long-term users. This protocol is for adults ACTIVELY on long-term PPIs or H2 blockers (famotidine/Pepcid, ranitidine — now removed for NDMA contamination). The supplements address the documented nutrient gaps that develop with chronic acid suppression. CRITICAL secondary message: many PPI users could safely wean off if working with their doctor. PPIs are appropriate for confirmed Barrett''s esophagus, erosive esophagitis, peptic ulcer disease — but are commonly prescribed long-term for milder reflux that would respond to lifestyle changes and intermittent H2 blocker use. Talk to your prescriber about whether you''re actually a long-term PPI candidate or could try weaning. See Acid Reflux / Heartburn protocol for non-pharmaceutical alternatives.
Morning Energy & Drive
energy· 1 shared ingredient
Morning fatigue and low drive — distinct from afternoon crashes (see Afternoon Energy) and chronic fatigue (see Chronic Fatigue Recovery) — is usually a circadian/HPA-axis pattern. Healthy adults experience a cortisol awakening response (CAR) in the first 30-45 minutes after waking; flattened or blunted CAR produces the "wake up still tired" feeling. The drivers are usually insufficient sleep duration, fragmented sleep architecture, vitamin and mineral gaps (especially B-complex and iron in women), thyroid issues, or chronic HPA-axis dysregulation. This stack supports the energy-production pathways: B-complex for cellular ATP production, L-tyrosine for dopamine/norepinephrine synthesis, rhodiola for stress-related fatigue, and CoQ10 for mitochondrial function. If you''re consistently exhausted on adequate sleep, get labs first: ferritin, TSH and free T4, fasting glucose, B12, 25-OH vitamin D. Many "I''m just tired" complaints have a reversible underlying cause.
Healthy Aging 60+
senior· 1 shared ingredient
Healthy aging is not about frailty management — it''s about preserving function, independence, and quality of life into the 70s, 80s, and beyond. The physiology of 60+ adults is genuinely different from younger adults: B12 absorption declines (~10-30% have impaired absorption due to reduced gastric acid), skin vitamin D synthesis drops by ~50% relative to 30-year-olds, anabolic resistance means older muscles need more protein to maintain mass, bone density loss accelerates (especially in postmenopausal women), and chronic disease burden rises. The good news: every one of these is addressable with the right combination of nutrition, training, and targeted supplementation. The strongest predictor of healthy aging is not genetics — it''s grip strength, gait speed, and cardiovascular fitness. This is the FOUNDATION protocol for adults 60+ — distinct from Foundational Longevity (broad-age longevity foundation) and Daily Essentials (general adult). Six core supplements that address the documented physiological changes of aging. Layer disease-specific protocols (Bone Density Support, Sarcopenia, Cardiovascular protocols, Cognitive Aging) on top of this baseline. The biggest single intervention available to older adults is resistance training. No supplement combination compensates for sedentary aging. Strength training 2-3× per week preserves muscle mass, bone density, and metabolic function more than any nutritional intervention.
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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.