Iron Bisglycinate
Iron bound to two molecules of the amino acid glycine. Also sold as Ferrous Bisglycinate, Iron Glycinate. No authority has published an intake figure for iron bisglycinate itself. The figures further down are iron’s, and this page says what they count.
Stacky is an organisational tool, not a medical device. It does not provide medical advice, and nothing on this page says what iron bisglycinate does. Talk to a doctor or pharmacist before starting, stopping or changing what you take.
The number on the bottle and the number in the limit
Intake references for a mineral are set on the element. When EFSA writes 250 mg for magnesium, it means 250 milligrams of magnesium, the metal itself.
A supplement label can mean either of two things by a milligram. Some brands declare the iron delivered. Others declare the mass of the whole compound, iron plus whatever it is bound to. The iron is only a fraction of that weight, and the fraction is different for every salt.
| Form | Iron by weight |
|---|---|
| Iron bisglycinate | about 27% |
Calculated from each compound’s anhydrous formula (Fe(C₂H₄NO₂)₂ for iron bisglycinate) using standard atomic weights. Real product is usually a little lower, because these salts are often sold hydrated. This is our arithmetic, not a regulator’s figure.
A label that declares the element writes it like this. The figure is iron, and it is the number the references below are about.
Iron (as ferrous bisglycinate) ................ 25 mg
A label that names only the compound writes it like this. That figure is the whole salt, and the iron in it is about 27% of it.
Ferrous bisglycinate ........................... 90 mg
Stacky does not convert between the two. We do not know which salt, which hydrate or which convention your brand used, and a guess would turn a figure you can check into one you cannot.
Published intake references for iron, the element
These figures are iron’s. They are here because iron bisglycinate is a source of iron, not because any authority set them for iron bisglycinate. Where the EU and the US disagree, both are shown; nothing is averaged, converted or reconciled. A tolerable upper intake level is the only kind of figure that sets a ceiling; a recommended or adequate intake is context, not a limit.
On the EU ceiling and this form. EFSA has published no upper limit for iron. The US figure of 45 mg is set on iron from all sources and carries no form note.
“None established” means that authority examined iron and set no figure.
Products in Stacky’s catalogue declaring iron bisglycinate
2 products whose label names iron bisglycinate as the form. Amounts are what the manufacturer prints, in whichever convention the manufacturer chose; the product page shows them as declared. No product here is recommended, ranked or endorsed.
Indexed studies
A study reaches this page only if its own title names iron bisglycinate or one of its recorded alternative names, and does not name a disease or clinical condition. Titles are the studies’ own words, newest first. A study appearing here is not a statement that iron bisglycinate does what the study set out to look at. How this list is built →
| Title | Journal | Year | Reference |
|---|---|---|---|
| The effects of oral ferrous bisglycinate supplementation on hemoglobin and ferritin concentrations in adults and children: a systematic review and meta-analysis of randomized controlled trials. | Nutr Rev | 2023 | PubMed 36728680 |
Showing 1 of the 5 papers indexed against iron bisglycinate in Stacky.
About this page
What this page does not contain: a figure of its own for iron bisglycinate, a recommended dose, a grade, a conversion of any product’s amount, or any statement that it treats, prevents or improves a condition. How these pages are built →
Figures are read from the authorities’ published tables and can go out of date when those tables are revised. If one here is wrong, tell us at support@stacky-app.com and we will check it against the source.