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 83 of 133), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.
- NZURI ElixirNZURI150 mcg
- O-Cal F.A.Pharmics · off the market150 mcg
- O-Cal PrenatalPharmics · off the market150 mcg
- O.N.E. MultivitaminPure Encapsulations150 mcg
- O2O2 Worldwide · off the market0.6 mcg as transcribed, likely a slip
- OB Complete OneVertical Pharmaceuticals150 mcg
- OC PackDouglas Laboratories75 mcg
- Ocean KelpHigher Nature360 mcg
- Ocean Kelp 300 mgHigher Nature · off the market360 mcg
- Ocean MineralsCrystal Star120 mcg
- OcuDyne IIAllergy Research Group12 mcg
- OcuDyne llNutriCology12 mcg
- OculairBiosyntrx · off the market50 mcg
- Ocuvite Eye+MultiBausch & Lomb150 mcg
- Omega Complete For MenBronson Laboratories150 mcg
- Omega Complete For WomenBronson Laboratories150 mcg
- Omega VitaliSEADr. Sinatra · off the market150 mcg
- Omega-3 SLIM MAXDr. Sinatra75 mcg
- Omega3Regenesis21,100 mcg as transcribed, likely a slip
- Omni Jr.DaVinci Laboratories Of Vermont13.3 mcg
- OMNI With Chelated MineralsHighland Laboratories225 mcg
- OmniumSolgar150 mcg
- Once Daily Adult 50+ MultivitaminSolaray150 mcg
- Once Daily Bariatric MultiVitaminBariatric Choice150 mcg
- Once Daily High Energy Iron Free MultivitaminSolaray · off the market22.5 mcg
- Once Daily High Energy Multi-Vita-MinSolaray · off the market22.5 mcg
- Once Daily High Energy Multi-Vita-Min Liquid Natural Orange FlavorSolaray22.5 mcg
- Once Daily High Energy MultivitaminSolaray22.5 mcg
- Once Daily High Energy Multivitamin Timed ReleaseSolaray22.5 mcg
- Once Daily Men's MultiNobi Nutrition100 mcg
- Once Daily Multi VitaminLuckyVitamin150 mcg
- Once Daily Multi-VitaminVitacost Synergy150 mcg
- Once Daily Multiple Vitamins, Minerals & HerbsSaveWorldHealth.com · off the market75 mcg
- Once Daily MultivitaminNatrol150 mcg
- Once Daily Prenatal MultiMeijer150 mcg
- Once Daily Woman MultivitaminSolaray150 mcg
- One 'N' OnlyPure Essence Labs · off the market150 mcg
- One 'n' OnlyPure Essence150 mcg
- One 'n' Only MenPure Essence150 mcg
- One 'N' Only Men's FormulaPure Essence Labs150 mcg
- One 'n' Only PrenatalPure Essence150 mcg
- One 'n' Only WomenPure Essence Labs · off the market150 mcg
- One 'n' Only WomenPure Essence150 mcg
- One A Day Kids with Nature's MedleyBayer One A Day Kids90 mcg
- One All-In-One Nutritional ChocolateVega · off the market80 mcg
- One All-In-One Nutritional Shake BerryVega80 mcg
- One All-In-One Nutritional Shake ChocolateVega80 mcg
- One All-In-One Nutritional Shake French VanillaVega80 mcg
- One All-In-One Nutritional Shake NaturalVega80 mcg
- One All-In-One Nutritional Shake Vanilla ChaiVega80 mcg