Nutrients
Selenium, iodine, iron, vitamin D, and other nutrients that matter in hypothyroidism and Hashimoto's: what the research supports and what it doesn't.
Brazil Nuts and Your Thyroid: How Many per Day, and Is It Safe?
One Brazil nut holds 68–91 µg of selenium, above the 55 µg adult RDA. How many are safe for your thyroid, and when nuts plus supplements are too much.
L-Carnitine and Thyroid: The Hyperthyroid Symptom Trial
L-carnitine has randomized trial evidence for reducing hyperthyroid symptoms but not for hypothyroidism. See what the data actually shows.
Choline and Hashimoto's: Eggs, Liver, and the Methylation Question
Choline supports methylation and cell membrane health — but does it matter for Hashimoto's? See what the evidence actually shows.
Copper and Thyroid: The Copper/Zinc Ratio Question
Copper interacts with zinc and thyroid hormone metabolism. See what the evidence says about copper, the copper/zinc ratio, and thyroid function.
Curcumin and Hashimoto's: What the Research Actually Shows
Curcumin may reduce TPO antibodies and inflammation in Hashimoto's, but poor absorption is the catch. Here's what the RCTs actually found.
Supplements for Hashimoto's: What's Reasonable for Beginners
Newly diagnosed with Hashimoto's? Here are the few supplements that actually make sense, and the popular ones to skip — in plain English.
Myo-Inositol and Hashimoto's: A Promising but Small Evidence Base
Small Italian RCTs show myo-inositol plus selenium may lower TPO antibodies and TSH in Hashimoto's — here's what the evidence actually says and what's missing.
Iodine and Hypothyroidism: Why More Is Not Better for Hashimoto's
Iodine and hypothyroidism have a U-shaped relationship: too little causes deficiency, too much can worsen Hashimoto's. What WHO, NIH, and the ATA actually say.
Iron Deficiency and Thyroid: Why Low Ferritin Mimics Hypothyroid Symptoms
Iron deficiency and thyroid symptoms overlap: TPO needs iron to build hormone, and low ferritin can leave you exhausted even when your TSH looks fine.
Iron Supplements Compared: Ferrous Sulfate, Bisglycinate, Heme, Liposomal
Ferrous sulfate, bisglycinate, heme, liposomal: what the trials show on tolerance, absorption, every-other-day dosing, and levothyroxine timing.
Magnesium and Thyroid Function: What the Evidence Actually Shows
Does magnesium help your thyroid? The biochemistry is real, observational data hints at a link, but no monotherapy trial has proven a thyroid benefit yet.
Manganese and Thyroid: A Trace Mineral Without a Thyroid Story
Manganese is in many 'thyroid support' supplements, but the actual thyroid evidence is thin. See what's real.
Melatonin and the Thyroid: Sleep, Antioxidants, and Caveats
Melatonin has antioxidant effects on the thyroid and may help sleep in Hashimoto. See what the evidence shows, dosing, and pregnancy caveats.
N-Acetylcysteine (NAC) and Hashimoto's: What the Evidence Actually Shows
NAC is sold as a Hashimoto's supplement based on one small trial. See what the evidence actually shows about N-acetylcysteine and thyroid antibodies.
Omega-3 Fatty Acids and Thyroid Health: What the Research Actually Shows
Omega-3s show anti-inflammatory promise for Hashimoto's, but the evidence is emerging — here's what studies actually found and what it means for you.
Pernicious Anemia and Hashimoto's: The Link and When to Test B12
About 3 in 10 people with Hashimoto's carry parietal-cell antibodies, a sign of the stomach autoimmunity behind pernicious anemia. Which B12 tests help.
Polyphenols, Green Tea, and the Thyroid: Antioxidant Promise, Practical Limits
Green tea polyphenols like EGCG reduce oxidative stress in lab models, but human thyroid trials are sparse and high-dose extracts risk liver toxicity.
Probiotics and Hashimoto's: What the Gut-Thyroid Research Shows
Research links gut dysbiosis to Hashimoto's autoimmunity. Here's what RCTs and meta-analyses actually show about probiotics and thyroid health.
Quercetin and Hashimoto's: Antioxidant Hype or Real Help?
Quercetin is sold as a Hashimoto's supplement. See what the evidence actually shows about this plant antioxidant.
Resveratrol and Hashimoto's: Antioxidant Hype vs Evidence
Resveratrol shows antioxidant effects on thyroid cells in lab models, but human Hashimoto's evidence is essentially absent. See what's known.
Seaweed Iodine: Safe Limits for Thyroid
Seaweed iodine varies widely: nori is usually low, while kombu or kelp can exceed the 1,100 mcg adult daily upper limit.
Selenium and Hashimoto's: What the Research Actually Shows
Selenium and Hashimoto's: a 2010 meta-analysis showed 200 mcg/day lowered TPO antibodies in 3 months. See what the evidence shows, and where it's weaker.
Thyroid Meals: Selenium, Zinc, Iron, D, B12
Plan thyroid meals around selenium, zinc, iron, vitamin D and B12 with food- first choices, lab context and safe levothyroxine timing.
Thyroid Calcium Tracker App
Track calcium foods, supplements, thyroid labs, symptoms, meals, and levothyroxine timing in one thyroid-focused record.
Thyroid Folate Tracker App
Track folate foods, folic-acid supplements, meals, thyroid labs, symptoms, and levothyroxine timing in one thyroid routine.
Thyroid Iodine Tracker App
Track iodine foods, supplements, thyroid labs, symptoms, meals, levothyroxine timing, and clinician questions in one record.
Thyroid Iron Tracker App
Track iron foods, supplements, ferritin, thyroid labs, symptoms, meals, and levothyroxine timing in one thyroid-focused record.
Thyroid Magnesium Tracker App
Track magnesium foods, supplements, thyroid labs, symptoms, meals, levothyroxine timing, and clinician questions in one record.
Thyroid and the Gut Microbiome: What's Real, What's Hype
The gut microbiome differs in Hashimoto's, but most 'fix your gut to fix your thyroid' claims outrun the evidence. What helps, what's hype.
Thyroid Omega-3 Tracker App
Track omega-3 foods, supplements, meals, thyroid labs, symptoms, and levothyroxine timing in one thyroid-focused routine record.
Oxidative Stress in Hashimoto's: What's Real and What Antioxidants Can Actually Do
Oxidative stress is real in Hashimoto's, but generic antioxidant supplements aren't the fix. See what the evidence actually supports.
Thyroid Selenium Tracker App
Track selenium foods, supplements, thyroid labs, symptoms, meals, levothyroxine timing, and clinician questions in one record.
Thyroid Zinc Tracker App
Track zinc foods, supplements, thyroid labs, symptoms, meals, levothyroxine timing, and clinician questions in one record.
Tyrosine and Thyroid: Do You Really Need to Supplement?
L-tyrosine is the building block of thyroid hormone, but supplementing rarely helps. See what the evidence shows and when (if ever) it's worth trying.
Vitamin A and Thyroid: The Retinol Connection You Don't Hear About
Vitamin A and thyroid hormone share the same receptor family. See what the evidence shows about retinol, T3, and TSH in deficiency and supplementation.
Vitamin B12 and Hypothyroidism: Why Deficiency Is So Common and What to Do About It
B12 deficiency is common in Hashimoto's and hypothyroidism — often causing fatigue and brain fog that mirror thyroid symptoms. Here's why it happens and when to test.
Vitamin C and Levothyroxine: Can Acid Improve Absorption?
Vitamin C may improve levothyroxine absorption by lowering gastric pH. See what the trials show and when it actually helps.
Vitamin D and Hashimoto's: What the Evidence Actually Shows
Vitamin D and Hashimoto's: low levels are common and small RCTs show modest antibody drops, but causation is unsettled — test 25(OH)D before supplementing.
Vitamin E and Thyroid Function: What Does the Evidence Show
Vitamin E is an antioxidant studied in Hashimoto's. Small trials show mixed results and supplements above 400 IU carry risks. Food sources are safer.
Vitamin K2 and Thyroid: Is There a Real Connection?
Vitamin K2 is sold as part of thyroid stacks alongside vitamin D. See what the evidence actually shows about K2 and thyroid function.
Zinc and Thyroid Function: What the Evidence Actually Shows
Does zinc help the thyroid? It's a cofactor for T4-to-T3 conversion, but RCT evidence is small, mostly outside Hashimoto's, and limited and inconsistent.