mineral
Iodine supplements
Half of the 6,382 iodine supplements in the NIH label database that print an amount list 150 mcg or less per serving; the middle half list 75 mcg to 150 mcg, and 1 in 67 of the 6,300 with a plausible amount give more than the adult upper limit at the most servings their labels direct (DSLD version 9.4.0, January 2026). The 110 products whose only supplement ingredient is iodine list a median of 237.5 mcg, and 34% of them give more than the upper limit.
- Products listing it
- 6,6366,382 print an amount; 251 list it inside a blend without an amount
- Median per serving
- 150 mcgmiddle half 75 mcg to 150 mcg
- FDA Daily Value
- 150 mcgthe median is 100% of it
- Adult upper limit (IOM)
- 1,100 mcg94 products go above it a day
How much iodine do supplements contain?
The median product lists 150 mcg per serving. One in ten lists 37.5 mcg or less, one in ten 225 mcg or more. The amount printed most often is 150 mcg (2,658 products).
Products by amount of iodine per serving
6,382 products, log scale; extreme 0.2% at each end left out of the drawing.
Source: Supplement Facts rows of every product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; amounts in one measure (weight).
How do the amounts compare with the Daily Value and the upper limit?
The FDA Daily Value for iodine is 150 mcg (adults and children 4 and older). The median product gives 100% of it per serving; the 90th percentile 150%.
The adult Tolerable Upper Intake Level is 1,100 mcg a day (total intake from food, water and supplements). At the most servings their labels direct, 94 of the 6,300 products with a plausible amount (1.5%) give more than that from the supplement alone (what counts as plausible).
The upper limit is for total intake from food, water and supplements unless stated, and does not apply under medical supervision. A label amount is what the maker printed. This is data, not advice: the NIH ODS fact sheets explain what each nutrient does.
Sources: 21 CFR 101.9(c)(8)(iv) (Daily Values); Institute of Medicine, DRI summary tables (2011) (upper limits); on reading them, the FDA's Daily Value page.
Which products list the most iodine?
On-market products, per serving, with a plausible amount: the rule leaves out likely entry slips, such as an amount far beyond every other label with no %DV or strength on the label to back it (each product page still shows its own amount, marked).
- Potassium IodateVitamin Research Products50,000 mcg
- IodineBio-Tech Pharmacal50,000 mcg
- Iodoral IOD - 50Optimox50,000 mcg
- Iodine & RhodiolaDr. Wong's Essentials30,000 mcg
- Thyroid CareTerry Naturally30,000 mcg
- Thyroid CareEuroMedica30,000 mcg
- Thyroid Care PlusTerry Naturally30,000 mcg
- Tri-Iodine 25 mgTerry Naturally25,000 mcg
Have the amounts changed over the years?
Products whose current label entered DSLD in 2011 list a median of 150 mcg; those entered in 2025, 150 mcg.
| Year | Products | Median per serving |
|---|---|---|
| 2011 | 149 | 150 mcg |
| 2012 | 433 | 150 mcg |
| 2013 | 538 | 150 mcg |
| 2014 | 256 | 150 mcg |
| 2015 | 268 | 150 mcg |
| 2016 | 310 | 150 mcg |
| 2017 | 329 | 150 mcg |
| 2018 | 280 | 120 mcg |
| 2019 | 331 | 150 mcg |
| 2020 | 640 | 150 mcg |
| 2021 | 514 | 104.5 mcg |
| 2022 | 643 | 150 mcg |
| 2023 | 580 | 150 mcg |
| 2024 | 598 | 150 mcg |
| 2025 | 513 | 150 mcg |
Source: DSLD label entry dates and amounts, current labels.
In which products and brands?
Products listing iodine by DSLD product type
Brands listing it most: Nature's Way (201), Douglas Laboratories (159), Nature's Plus (158), Centrum (69), Bronson (57), New Chapter (57), XYMOGEN (56), NOW (51), Metagenics (50), Rainbow Light (48).
Every product listing iodine
6,636 products, A to Z by name (page 133 of 133), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.
- Women's Ultra Mega With ProbioticsGNC Women's Ultra Mega150 mcg
- Women's VeganNutrafol225 mcg
- Women's VitalityAncient Nutrition290,000 mcg as transcribed, likely a slip
- Women's WellnessBio Nutrition75 mcg
- Women’s Multivitamin Capsules with Iron 45 mgBariatric Fusion150 mcg
- Women’s One 50+Rainbow Light150 mcg
- WP MineralsKirkman100 mcg
- X500 German Chocolate FlavorUbervita · off the market30 mcg
- XenoStatPremier Research Labs300 mcg
- XodineCedar Bear2,694 mcg
- Xtreme Size Up ChocolateMET-Rx66 mcg
- Xtreme Size Up VanillaMET-Rx66 mcg
- XxEssential Beginnings · off the market150 mcg
- XyEssential Beginnings · off the market150 mcg
- XymoDineXYMOGEN12,500 mcg
- Yang EssentialsSun Ten225 mcg
- Yeast Free Vegetarian MultiGNLD Nutritionals · off the market100 mcg
- Yin EssentialsSun Ten225 mcg
- Young Men's Multivitamin Plus Healthy SkinRainbow Light Vibrance · off the market100 mcg
- Your Life Multi Green SouceNature's Bounty150 mcg
- Your Life Multi Green SourceNature's Bounty · off the market150 mcg
- Yum Labs Nutrition Keto ACV GummiesJustified Laboratories100 mcg
- ZEssential Beginnings · off the market220 mcg
- Z+Essential Beginnings · off the market150 mcg
- Zalvit Tabletsnbgs PHARMA150 mcg
- Zatean -Pn PlusTrigen Laboratories150 mcg
- ZeotrexGlobal Healing Center · off the market400 mcg
- Zero Carb Protein Powder Mango PeachISOPURE38 mcg
- Zero Iron Hi-Potency Multi Vitamin-MineralWonder Laboratories150 mcg
- Zinc CopperSolaray · off the market53 mcg
- Zinc Copper Amino Acid Chelate with Kelp & Pumpkin SeedSolaray · off the market53 mcg
- ZiphexAyurax150 mcg
- Zoo Chews GummiesBerkley & Jensen20 mcg
- Zoo Friends Complete21st Century Zoo Friends75 mcg
- Zow Multi-Vites For Teenage BoysNutrition Now · off the market50 mcg
- Zow Multi-Vites For Teenage GirlsNutrition Now · off the market50 mcg