mineral

Iron supplements

Half of the 6,910 iron supplements in the NIH label database that print an amount list 5 mg or less per serving; the middle half list 1.2 mg to 18 mg, and 1 in 29 of the 6,825 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 291 products whose only supplement ingredient is iron list a median of 27 mg, and 25% of them give more than the upper limit.

How much iron do supplements contain?

The median product lists 5 mg per serving. One in ten lists 0.5 mg or less, one in ten 27 mg or more. The amount printed most often is 18 mg (778 products).

How do the amounts compare with the Daily Value and the upper limit?

The FDA Daily Value for iron is 18 mg (adults and children 4 and older). The median product gives 28% of it per serving; the 90th percentile 150%.

The adult Tolerable Upper Intake Level is 45 mg a day (total intake from food, water and supplements). At the most servings their labels direct, 234 of the 6,825 products with a plausible amount (3.4%) 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.

Which forms of iron do labels name?

Ferrous fumarate is the form named most often: 1,280 of the 8,696 iron products (15%), ahead of iron bisglycinate (546, 6%) and ferrous gluconate (228, 3%). A product naming two forms counts in both; the table below gives every form.

• Ferrous fumarate
• Iron bisglycinate
• Ferrous gluconate
• Ferrous sulfate
• Carbonyl iron
• Polysaccharide-iron complex

Which products list the most iron?

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).

• Trigelsd-F ForteTrigen Laboratories151 mg
• Trigels-F ForteTrigen Laboratories151 mg
• Ferrex-150Major150 mg
• Ferrex 150 Plus CapsulesBreckenridge150 mg
• Ferrex 150Breckenridge Pharmaceutical150 mg
• FEONYX 1 mg/150 mgAmella Pharma150 mg
• Corvite 150Vertical Pharmaceuticals150 mg
• Corvite FeVertical Pharmaceuticals150 mg

Have the amounts changed over the years?

Products whose current label entered DSLD in 2011 list a median of 6 mg; those entered in 2025, 4 mg.

In which products and brands?

Brands listing it most: Nature's Plus (162), Nature's Way (73), Core Nutritionals (63), Douglas Laboratories (58), Amazing Grass (55), Bronson (50), Sunwarrior (50), Garden of Life (49), Solgar (47), XYMOGEN (45).

Every product listing iron

8,696 products, A to Z by name (page 97 of 174), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.

• Nectar Sweets Chocolate TruffleSyntrax0.7 mg
• Nectar Sweets Double Stuffed CookieSyntrax0.5 mg
• Nectar Sweets Strawberry MousseSyntraxno amount
• Nectar Sweets Vanilla Bean TorteSyntraxno amount
• Nectar Tangy MangoSyntraxno amount
• Nectar Twisted CherrySyntraxno amount
• Nectar Wild GrapeSyntraxno amount
• NeevoDHAPamlab · off the market27 mg
• NeevoDHAAlfasigma USA27 mg
• NeoLife Pro Vitality+GNLD · off the market6 mg
• NeoLife Shake Berries N' CreamNeoLife Shake6.3 mg
• NeoLife Shake ChocolateNeoLife Shake6 mg
• NeoLife Shake Creamy VanillaNeoLife Shake6.3 mg
• NeoLife Shake Rich ChocolateNeoLife Shake6 mg
• NeoLifeBar Dark Chocolate Peanut ButterNeoLife · off the marketin a blend
• NeoLifeBar Fruit & NutsNeoLife · off the market4.1 mg
• NeoLifeShakeNeoLife · off the market6 mg
• NeoLifeShake Berries n' CreamNeoLife Nutritionals · off the marketin a blend
• NeoLifeShake Berries n' CreamNeoLife · off the market6.3 mg
• NeoLifeShake Creamy VanillaNeoLife Nutritionals · off the marketin a blend
• NeoLifeShake Creamy VanillaNeoLife · off the market6.3 mg
• NeoLifeShake Rich ChocolateNeoLife Nutritionals · off the marketin a blend
• NeoLifeShake Rich ChocolateNeoLife · off the market6 mg
• NeoLifeShake VanillaNeoLife Nutritionals6.3 mg
• Nervon Forte Delightful Orange FlavorGM Germa24 mg
• NestabsWomen's Choice Pharmaceuticals32 mg
• Nestabs DHAWomen's Choice Pharmaceuticals · off the market32 mg
• Nestabs DHA Multi-Vitamin/Mineral TabletWomen's Choice Pharmaceuticals32 mg
• Nestabs OneWomen's Choice Pharmaceuticals38 mg
• Neubria ZoneNeubria3.6 mg
• NeuroOweli1 mg
• NeuroKaya Naturals1 mg
• Neuro BoostVostok1 mg
• Neuro HealthNature’s Craft1 mg
• Neuro PlusInvictus Labs · off the market1 mg
• Neuro RechargeLongevity Premier1 mg
• Neuro RiseTrimedix · off the market1 mg
• Neuro Smart Brain Extra Strength20S20 Nutrition1 mg
• Neuro+Millecor1 mg
• Neuro+Arbor Nutrition · off the market1 mg
• NeuroplexSP Standard Process8.9 mg
• New Glo Hairnutra4health · off the market14.5 mg as transcribed, likely a slip
• New Life Hair With CopperSundown Naturals15 mg
• New Life Hair With SilicaSundown Naturals · off the market1 mg
• New MomHerbalife Nutrition6.8 mg
• New Zealand Grass-Fed Super Protein All Natural VanillaFortifeye0.27 mg
• New Zealand Grass-Fed Super Protein Dark Chocolate FudgeFortifeye Performance Nutrition1 mg
• New Zealand Whey Protein Isolate ChocolateAntler Farmsno amount
• New Zealand Whey Protein Isolate Iced MochaAntler Farmsno amount
• New Zealand Whey Protein Isolate Mixed BerryAntler Farmsno amount

Where next?

• Iron capsules
• Iron drops
• Iron gummies
• Iron powder
• Liquid iron
• Vegan iron
• Check an amount of iron
• Labels above the upper limit
• All ingredients