A form of iron
Iron bisglycinate supplements
546 iron products in the NIH label database list iron as iron bisglycinate (6% of the 8,696 iron products); their median is 18 mg of iron per serving, against 5 mg across all iron products; the 63 whose only supplement ingredient is iron list a median of 25 mg (DSLD version 9.4.0, January 2026).
How does iron bisglycinate 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
- 546379 on the market
- Median iron per serving
- 18 mgall iron products: 5 mg
- Share of iron products
- 6%546 of 8,696
Is the amount the iron or the whole iron bisglycinate?
A Supplement Facts row normally states the iron itself (a row like "Iron (as iron bisglycinate)"); a row named as the compound (a row like "Iron bisglycinate") 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 546 products here, 545 give the iron in its own row (4 of them an amount far outside what other labels list, or one their own %DV disagrees with); 1 give no amount of their own or one in another unit.
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, 23 of the 541 iron bisglycinate products with a plausible amount (4.3%) 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 B12 | 77% | 50 mcg | 36 mcg |
| Folate | 75% | 400 mcg | 400 mcg |
| Vitamin C | 74% | 125 mg | 100 mg |
| Vitamin B6 | 68% | 10 mg | 6 mg |
| Zinc | 67% | 15 mg | 11 mg |
| Thiamin | 65% | 5 mg | 5 mg |
| Riboflavin | 64% | 5 mg | 4 mg |
| Niacin | 64% | 20 mg | 20 mg |
| Vitamin E | 63% | 80 IU | 30 IU |
| Vitamin D | 61% | 15 mcg | 15 mcg |
Which products are they?
60 of the 546 (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.
- Maxi PrenatalMaxi Health50 mg
- Basic PrenatalThorne45 mg
- High Potency Iron 36 mgProtocol For Life Balance36 mg
- Chewable Iron 30 mg Natural Strawberry FlavorCarlson30 mg
- Maxi Prenatal CapsMaxi Health30 mg
- Fem PrenatalMetagenics30 mg
- Ultra HematinicNutra BioGenesis30 mg
- HemePlex FeNuMedica29 mg
- Blood Nutrients 28 mgCarlson28 mg
- Iron Glycinate 28 mgWonder Laboratories28 mg
- Chelated Iron 27 mgCarlson27 mg
- Ferrochel SelectMoss Nutrition27 mg
- Iron ComplexNOW27 mg
- Ladies' One PrenatalBluebonnet27 mg
- Blood BuilderMegaFood26 mg
- Blood Builder MinisMegaFood26 mg
- Perfect IronNature's Lab25 mg
- Baseline Iron+Gnarly Sports Nutrition25 mg
- Iron Bisglycinate 25 mgPure Naturals25 mg
- One 'n' Only PrenatalPure Essence20 mg
- Ladies' OneBluebonnet18 mg
- Alive! Max3 Potency Adult Complete Multivitamin Tablets with IronNature's Way18 mg
- Bio-Active Complete Multi Vitamin for WomenLiveGood18 mg
- Liquid Iron 18 mg Zero Sugar Berry FlavoredNature's Way18 mg
- Multiminerals & BoronBluebonnet18 mg
- Ladies' ChoiceBluebonnet18 mg
- Baby & Me 2 Prenatal MultiMegaFood18 mg
- Maxi Liquid Iron Natural Punch FlavorMaxi Health18 mg
- Hair ForceKAL18 mg
- Bowelsyl +BioPerineApproved Science16 mg
- Chewable Iron 15 mg Natural Strawberry FlavorCarlson Kid's15 mg
- Women's Advanced MultivitaminMegaFood15 mg
- Life Essence WomenPure Essence15 mg
- Blood Builder Liquid Iron Once Daily Orchard FruitMegaFood14 mg
- Wholesome IronWe Heart Nutrition13.5 mg
- Maxi OneBluebonnet10 mg
- Iron FolicNutrilite10 mg
- One 'n' Only WomenPure Essence9 mg
- Ortho MultiProtocol For Life Balance9 mg
- Women's 40+ Advanced MultivitaminMegaFood9 mg
- Women's One Daily MultivitaminMegaFood9 mg
- Hair Skin Nails +BioPerineApproved Science8 mg
- Multi+Butterfly Express6 mg
- Miracle 2000 EnergyCentury Systems6 mg
- Ortho Multi Softgels for WomenProtocol For Life Balance6 mg
- Vegan Liquid Iron BerryMary Ruth's6 mg
- CollagenicsMetagenics6 mg
- Kid Vits Juicy OrangeNOW Kids5 mg
- Men's Multi with IronSwanson5 mg
- Iron Ferrochel 5 mgKirkman5 mg
- MultiMedica for WomenNuMedica5 mg
- Electrolyte StaminaTrace Minerals TM Sport5 mg
- Women's 40+ One Daily MultivitaminMegaFood4.5 mg
- Essential Wellbeing ComplexHighbrow Hippie4.5 mg
- Optimal Balance For MenHardy Nutritionals3.8 mg
- ActivNutrients Chewable Natural Mixed Berry FlavorXYMOGEN3 mg
- Foundation Essentials for Women Multimedica for WomenNuMedica2.5 mg
- Advanced Mineral SupportKirkman2 mg
- Children's Feed My Brain Fruit Punch FlavorTrace Minerals1 mg
- CoComelon Toddler Multivitamin Liquid Drops Orange VanillaMary Ruth’s0.2 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?
Carlson (20), MegaFood (20), Nature's Way (18), Solgar (17), Bluebonnet (16), NOW (14), Metagenics (12), Kirkman (10), Futurebiotics (8), Seeking Health (7).