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 29 of 174), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.

• Collagen Powder UnflavoredDivine Health1.5 mg
• Collagen ProtectMoon Juice3.8 mg
• Collagen ProteinAntler Farms · off the marketno amount
• Collagen Protein Broth Curcumin ChiliFREZZOR0.4 mg
• Collagen Protein Broth Lavender ChamomileFREZZOR0.4 mg
• Collagen Protein Broth Lemon GingerFREZZOR0.4 mg
• Collagen Protein Broth Seasonal HerbsFREZZOR0.4 mg
• Collagen Protein ChocolateBulletproof2.7 mg
• Collagen Protein Powder ChocolateDose & Co1 mg
• Collagen Protein Powder VanillaDose & Cono amount
• Collagen Protein Shake Vanilla flavoryoutheory18 mg
• Collagen Protein VanillaBulletproof0.4 mg
• Collagen Restructuring ComplexHigher Nature · off the market0.75 mg
• Collagen Restructuring ComplexHigher Nature Aeterna Gold · off the market2.1 mg
• Collagen Sport Belgian ChocolateNeoCell Sport5.4 mg
• Collagen Sport French VanillaNeoCell Sport5.4 mg
• Collagen Strawberry FlavorGM Germano amount
• Collagen UnflavoredMuscle Feastno amount
• Collagen Unflavoredproject#10.32 mg
• Collagen Unflavored PowderFINAFLEXno amount
• Collagen VanillaGiant Sports International0.2 mg
• CollagenicsMetagenics6 mg
• Colloidal Minerals Natural Raspberry FlavorVitabase0.6 mg
• Colloidal Multi Mins Liquid Natural Orange FlavorGenestra Brands0.6 mg
• Colon Care PlusVitamin World1 mg
• Colon CleanseHealth Plus800 mg as transcribed, likely a slip
• Colon Cleanse Every Day CleanseHealth Plus22 mg as transcribed, likely a slip
• Colon Cleanse Every Day FiberHealth Plus · off the market0.8 mg
• Colon Cleanse Every Day Fiber Refreshing Orange FlavorHealth Plus · off the market0.8 mg
• Colon Cleanse Max Super Fiber BlendHealth Plus3 mg
• Colon Cleanse Natural Pineapple FlavorHealth Plus800 mg as transcribed, likely a slip
• Colon Cleanse Natural Strawberry FlavorHealth Plus0.8 mg
• Colon Cleanse Refreshing Pineapple FlavorHealth Plus · off the market0.8 mg
• Colon Cleanse Refreshing Strawberry FlavorHealth Plus · off the market0.8 mg
• Colon Cleanse Sugar Free Refreshing Orange FlavorHealth Plus0.8 mg
• Colon Pure Natural Citrus FlavorGNC Natural Brandin a blend
• Colon Pure UnflavoredGNC Natural Brandin a blend
• ColonBroom Premium Blend Strawberry FlavorColonBroom1 mg
• ColostrumSunshine Naturals · off the market1.4 mg
• Colostrum GOLD First MilkSunshine Naturals · off the market1.4 mg
• Colostrum GOLD First Milk 1000 mgSunshine Naturals1 mg
• Colostrum UnflavoredMuscle Feastno amount
• Combat Powder Banana CreamMusclePharmin a blend
• Combat Powder Choclate Peanut ButterMusclePharmin a blend
• Combat Powder Chocolate MilkMusclePharmin a blend
• Combat Powder Chocolate Peanut ButterMusclePharmin a blend
• Combat Powder Cookies 'N' CreamMusclePharm0.3 mg
• Combat Powder Orange CreamsicleMusclePharm0.45 mg
• Combat Powder S'moresMusclePharmin a blend
• Combat Powder Triple BerryMusclePharmin a blend

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