Is a higher dose always better?

No. Dose-fit rewards landing inside the range studied for the outcome — over-dosing (common with melatonin) or under-dosing both lower the score. The goal is the effective dose, not the biggest number.

What does the Value score mean?

The Value score compares a product's price per serving with clinically relevant products ranked for the same outcome. A score of 50 is the typical price; above 50 means better value than typical, while below 50 means the product costs more than typical. It is a 0–100 value signal, not a percentile.

Why is the cheapest product not #1?

Cost is only one input. The cheapest pick here is a citrate form with weaker absorption and a stock-risk flag, so it leads on Value-for-cost but trails on the composite that also weighs evidence, dose fit and availability.

Are these affiliate links?

Retailer links may be affiliate links and DoseRank may earn a commission. Rankings and placement are determined by the scoring model only — never by payment from a brand.

Is this medical advice?

No. DoseRank summarizes evidence to help you choose; it is not a substitute for a clinician, especially if you are pregnant, breastfeeding, on medication, or managing a health condition.

Normalize TSH

What this outcome means

Thyroid-stimulating hormone, or TSH, is the pituitary signal used to gauge whether your thyroid is running fast, slow, or on track. On DoseRank it maps to a defined health outcome built from human studies on circulating TSH concentrations, reference-range positioning, and shifts in thyroid signaling – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Tracking thyroid labsPeople keeping an eye on TSH numbers across repeat blood tests.

Sluggish-symptom watchersThose noticing fatigue, cold, or weight shifts tied to thyroid signaling.

Borderline readingsAdults whose results sit near the edges of the reference range.

Stack buildersAlready taking supplements such as Potassium Iodide and want the dose right.

Evidence level

92Strong

Potassium Iodide – has strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 79 means this product's ingredient forms and doses are close to what was used in the studies behind this ranking - DoseRank weights each product ingredient.

Best ingredients

Potassium Iodide is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 79

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Potassium Iodide 330 mcg (calculated) vs 150-500 mcg.

Processed

Available

Ingredients

Brands

326

Coverage

100%

How to read the scores

What every metric means

Each score is 0–100. Higher is better for every metric below.

CompositeThe overall DoseRank score — a weighted blend of clinical strength, evidence, dose fit, trust and value.Higher is better

ClinicalHow strongly the formula's ingredients and doses match what clinical studies used for this outcome.Higher is better

EvidenceHow much published human research backs the formula's key ingredients for this outcome — both how many studies exist and how strong they are.Higher is better

ValueHow the price per serving compares with similar products for this outcome — 50 is the typical price, higher means better value for your money.Higher is better

TrustHow well customers rate this product, with extra weight given to ratings backed by a large number of reviews.Higher is better

PopularityHow strongly this product sells compared with the other ranked products for this outcome.Higher is better

This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →

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Get a personal report

A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.

Questions

Frequently asked

Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.

Normalize TSH

What this outcome means

Who it's for

Tracking thyroid labsPeople keeping an eye on TSH numbers across repeat blood tests.

Sluggish-symptom watchersThose noticing fatigue, cold, or weight shifts tied to thyroid signaling.

Borderline readingsAdults whose results sit near the edges of the reference range.

Stack buildersAlready taking supplements such as Potassium Iodide and want the dose right.

Evidence level

92Strong

Best ingredients

Potassium Iodide is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 79

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Potassium Iodide 330 mcg (calculated) vs 150-500 mcg.

Processed

Available

Ingredients

Brands

326

Coverage

100%

Relevant ingredients

Which ingredient types matter for thyroid-stimulating hormoneOpen to see which ingredient types matter for thyroid-stimulating hormone

4.2k products across 3 ingredient types — open to filter the ranking.

Use types to filter ranked products

Vitamins

2.5k products

Essential micronutrients the body can't make in sufficient amounts. Fat-soluble ones (A, D, E, K) store up; water-soluble ones need regular topping-up.

Typical: ,

Minerals & Trace Elements

1.6k products

Inorganic nutrients from calcium to zinc. The chemical form drives absorption – chelates and citrates usually beat cheap oxides.

Typical:

Botanicals/Herbal Extracts

102 products

Concentrated plant and herbal extracts standardized to actives. Potency depends on the extract ratio and marker content, not raw weight.

Typical: ,

Top decision cards

Best products for thyroid-stimulating hormone

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for thyroid-stimulating hormone

Life Extension, Sea-Iodine™, 1,000 mcg, 60 Vegetarian Capsules

Life Extension$0.09 / serving4.8 · 19,822Available now

Also helps with

Iodine status

Thyroid function

Why this ranks here

Evidence fitPotassium Iodide is the strongest evidence signal for this outcome.
Dose fitPotassium Iodide at 330 mcg (calculated) lands inside the studied 150-500 mcg window.
Price / serving$0.09 per serving — low price tier for this outcome.
AvailabilityIn stock across major retailers; 99% availability confidence.
TrustStrong trust signals — consistently high marks from verified buyer ratings.

The numbers

330 mcg (calculated)In rangeinside the studied 150-500 mcg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

Life-flo, Liquid Iodine Plus with Potassium Iodide, Unflavored, 2 fl oz (59 ml)

Life-floClinical88Dose fit67Popularity99$0.02/ serving

Natural Factors, Liquid Kelp, 800 mcg, 1.6 fl oz (50 ml)

Natural FactorsClinical89Dose fit83Popularity68$0.01/ serving

NOW Foods, Potassium Plus Iodine, 180 Tablets

NOW FoodsClinical88Dose fit72Popularity89$0.05/ serving

Eidon Ionic Minerals, Iodine, Liquid Concentrate, 2 oz (60 ml)

Eidon Ionic MineralsClinical88Dose fit72Popularity84$0.04/ serving

21st Century, Sentry, Adults Multivitamin & Multimineral Supplement, 300 Tablets

21st CenturyClinical88Dose fit67Popularity96$0.05/ serving

21st Century, One Daily, Men's Health, 100 Tablets

21st CenturyClinical88Dose fit67Popularity99$0.07/ serving

21st Century, One Daily, Women's, 100 Tablets

21st CenturyClinical88Dose fit67Popularity99$0.07/ serving

21st Century, Sentry Senior, Multivitamin & Multimineral Supplement, Adults 50+, 265 Tablets

21st CenturyClinical88Dose fit67Popularity91$0.06/ serving

MaryRuth's, Organic Iodine Liquid Drops, Unflavored, 250 mcg, 1 fl oz (30 ml)

MaryRuth'sClinical88Dose fit73Popularity84$0.04/ serving