Iron(II) fumarate, also known as ferrous fumarate, is the iron(II) salt of fumaric acid, occurring as a reddish-orange powder, used to supplement iron intake. It has the chemical formula C₄H₂FeO₄. Pure ferrous fumarate has an iron content of 32.87%, therefore one tablet of 300 mg iron fumarate will contain 98.6 mg of iron (548% Daily Value based on 18 mg RDI).

Quick Facts Names, Identifiers ...

Iron(II) fumarate

Names
IUPAC name Iron(2+) (2E)-but-2-enedioate
Other names Ferrous fumarate; Feostat
Identifiers
CAS Number	141-01-5 Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL1200640 N
ChemSpider	10607713 Y
ECHA InfoCard	100.004.953
PubChem CID	6433164
UNII	R5L488RY0Q Y
CompTox Dashboard (EPA)	DTXSID7047148
InChI InChI=1S/C4H4O4.Fe/c5-3(6)1-2-4(7)8;/h1-2H,(H,5,6)(H,7,8);/q;+2/p-2/b2-1+; Y Key: PMVSDNDAUGGCCE-TYYBGVCCSA-L Y InChI=1/C4H4O4.Fe/c5-3(6)1-2-4(7)8;/h1-2H,(H,5,6)(H,7,8);/q;+2/p-2/b2-1+; Key: PMVSDNDAUGGCCE-FMKVMNOJBF
SMILES [Fe+2].[O-]C(=O)/C=C/C([O-])=O
Properties
Chemical formula	C4H2FeO4
Molar mass	169.901 g·mol−1
Appearance	reddish-brown powder
Odor	odorless
Density	2.435 g/cm3 (20 °C)
Melting point	280 °C (536 °F; 553 K)
Solubility in water	slightly soluble
Pharmacology
ATC code	B03AA02 (WHO)
Hazards
NFPA 704 (fire diamond)	1 0 0
Lethal dose or concentration (LD, LC):
LD50 (median dose)	3850 mg/kg (oral, rat)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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Ferrous fumarate is often taken orally as an iron supplement to treat or prevent iron deficiency anemia.^[1] Mixtures of ferrous fumarate and potassium iodate, "double fortified salt", are used to address both iron and iodine deficiencies.^[2]

• Iron - Nutrition