A form of iron
Carbonyl iron supplements
164 iron products in the NIH label database list iron as carbonyl iron (2% of the 8,696 iron products); their median is 24 mg of iron per serving, against 5 mg across all iron products (DSLD version 9.4.0, January 2026).
How does carbonyl iron compare with the other forms?
The median amount of iron per serving in products naming each form; the count in brackets. The amount is the iron the label gives, as printed (the Supplement Facts row normally states the element; a row named as the compound usually gives the compound's weight and is left out of these figures).
Median iron per serving by form
Source: Supplement Facts rows and their forms, NIH ODS Dietary Supplement Label Database version 9.4.0, current labels.
- Products
- 164114 on the market
- Median iron per serving
- 24 mgall iron products: 5 mg
- Share of iron products
- 2%164 of 8,696
Is the amount the iron or the whole carbonyl iron?
A Supplement Facts row normally states the iron itself (a row like "Iron (as carbonyl iron)"); a row named as the compound (a row like "Carbonyl iron") usually states the compound's weight, which includes what the iron is bound to and is larger than the iron it supplies. The front of a bottle may print either. Of the 164 products here, 164 give the iron in its own row (1 of them an amount far outside what other labels list, or one their own %DV disagrees with).
The adult Tolerable Upper Intake Level for iron is 45 mg a day; it covers total intake from food, water and supplements. At the most servings their labels direct, 30 of the 163 carbonyl iron products with a plausible amount (18.4%) give more than that.
Source: Supplement Facts rows of each product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; upper limit: Institute of Medicine Dietary Reference Intakes (2011) (what counts as plausible).
What else do these products contain?
| Ingredient | Share of these products | Median here | Median, all products |
|---|---|---|---|
| Vitamin C | 92% | 120 mg | 100 mg |
| Folate | 87% | 1,000 mcg | 400 mcg |
| Vitamin B6 | 82% | 15 mg | 6 mg |
| Vitamin D | 80% | 10 mcg | 15 mcg |
| Vitamin E | 77% | 30 IU | 30 IU |
| Riboflavin | 76% | 3.4 mg | 4 mg |
| Zinc | 76% | 17 mg | 11 mg |
| Niacin | 74% | 20 mg | 20 mg |
| Thiamin | 74% | 3 mg | 5 mg |
| Vitamin B12 | 73% | 15 mcg | 36 mcg |
Which products are they?
60 of the 164 (on-market products first, the newest label first), ordered by the amount of iron per serving, largest first; an amount that looks like a slip or a compound's weight comes last, marked.
- Corvita 150Trigen Laboratories150 mg
- Corvite 150Vertical Pharmaceuticals150 mg
- Corvite FeVertical Pharmaceuticals150 mg
- Tl - Hem 150Trigen Laboratories150 mg
- Trinatal Ultra TabletsTrigen Laboratories90 mg
- Active FEAllegis Pharmaceuticals75 mg
- Iron 60 + Vitamin CCelebrate60 mg
- Chewable Iron 60 mg with Vitamin C Lemon & LimeBariatric Advantage60 mg
- Iron + Vitamin C Natural Orange FlavorBariMelts54 mg
- Elite OBTrigen Laboratories50 mg
- OB CompleteVertical Pharmaceuticals50 mg
- CelebrateONE 45 with Iron Tropical TwistCelebrate45 mg
- Iron 45 + Vitamin CCelebrate45 mg
- CelebrateONE 45 with Iron Midnight CherryCelebrate45 mg
- The Step Up by BarimeltsBariMelts45 mg
- Nestabs OneWomen's Choice Pharmaceuticals38 mg
- CitraNatal Assure Rx Prenatal TabletMission Pharmacal CitraNatal35 mg
- Tri Start OneCarwin Pharmaceutical Associates35 mg
- Tri Start FreeCarwin Pharmaceutical Associates33 mg
- TriStart DHACarWin Pharmaceutical Associates31 mg
- WestGel DHAWP Westminster Pharmaceuticals31 mg
- Iron 30 + Vitamin CCelebrate30 mg
- Chewable Iron 30 mgNature's Blend30 mg
- Chewable Iron 29 with Vitamin C Passion FruitBariatric Advantage29 mg
- PNV Tabs 29-1Virtus Pharmaceuticals29 mg
- Natal-V RX TabletsRochester Pharmaceuticals29 mg
- Thrivite Rx TabletsMethod Pharmaceuticals29 mg
- Prenatal MultiWindmill Natural Vitamins28 mg
- Once Daily Prenatal MultiMeijer28 mg
- Complete Prenatal Multi ComplexZazzee Naturals27 mg
- Klean IronKlean Athlete27 mg
- Tendera-OB Prenatal Multivitamin + DHABonGeo Pharmaceuticals27 mg
- Women Multivitamin + Supporting HerbsSuper Nutrition SimplyOne22 mg
- 50+ Women Multivitamin + Supporting HerbsSuper Nutrition SimplyOne22 mg
- CitraNatal B-Calm Rx Prenatal TabletMission Pharmacal CitraNatal20 mg
- Prenatal BlendSuper Nutrition20 mg
- Ultra Preventive III With Copper & IronDouglas Laboratories20 mg
- Ferretts Chewable Iron Supplement 18 mg Natural Lemon-Lime FlavorPharmics18 mg
- Multivitamin with Iron Natural Fruit FlavorBariMelts18 mg
- Iron 18 mg Zesty OrangeEZ Melts18 mg
- Multivitamin + Iron Tropical CherryEZ Melts18 mg
- Prenate MiniAvion Pharmaceuticals18 mg
- Wee Care Iron Wild Cherry FlavorCenturion15 mg
- Iron ChewsH2 Pharma15 mg
- Wee Care Wild Cherry FlavorCenturion15 mg
- Super Immune Seasonal Wellness MultivitaminSuper Nutrition12 mg
- High Potency Chewable Multiple Vitamin & Mineral FormulaTrader Joe's9 mg
- QuFlora FE Grape FlavorCarwin Pharmaceutical Associates9 mg
- Men Multivitamin + Supporting HerbsSuper Nutrition SimplyOne8 mg
- Centrum Women's MultiCentrum7 mg
- Focus FactorFocus Factor5 mg
- Kid's One Fruit Punch FlavoredRainbow Light5 mg
- Multi ViteGenestra Brands5 mg
- Brain & VisionFocus Factor5 mg
- FOCUSfactorFocus Factor5 mg
- Focus Factor Extra StrengthFocus Factor5 mg
- Super Orti ViteGenestra Brands4.5 mg
- Centrum Men's MultiCentrum4 mg
- Toddler Advanced Formula+ VanillaTruHeight3 mg
- Toddler Advanced Formula+ Chocolate FlavorTruHeight3 mg
Source: NIH ODS Dietary Supplement Label Database version 9.4.0; the form each label names for its row. Daily Values: the FDA's Daily Value page.
Which brands make them?
Mission Pharmacal CitraNatal (19), SuperNutrition (12), Douglas Laboratories (11), Trigen Laboratories (8), Rainbow Light (7), Genestra Brands (6), Super Nutrition SimplyOne (6), Celebrate (5), Focus Factor (4), Carwin Pharmaceutical Associates (4).