Ferrous Fumarate

Ferrous Fumarate is a dietary supplement available in 1 form.

FormulaForge carries a single form of Ferrous Fumarate, so there is no form to choose here. Forms on the market do differ in how well they absorb, which is why it is worth checking the form named on any product label.

ferrous fumarate (Mapped Form) has a bioavailability rating of moderate absorption.

Multiple forms of Ferrous Fumarate are available. Start by comparing form ratings — Preferred Forms reflect the strongest bioavailability evidence, and higher-absorption forms deliver more active compound per dose unit.

The appropriate form depends on your individual goals and your healthcare provider’s recommendations. Consult a qualified professional before selecting a supplement form.

Individual dose requirements vary based on health goals, body weight, and existing nutrient intake. Your healthcare provider can help you determine an appropriate amount of Ferrous Fumarate for you.

Side Effects: Consult your healthcare provider regarding tolerability, particularly at higher doses.

These statements are based on structure/function research and have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before starting or changing a supplement regimen.

The following studies and findings inform FormulaForge classifications for Ferrous Fumarate:

Human RCT in pregnant women: ferrous fumarate at more than double the elemental dose achieved serum iron increases comparable-to-or-lower than lower-dose ferrous bisglycinate. PMID: 35276810

Isotope study in preschool children: iron absorption from ferrous sulfate (~7.9%) exceeded ferrous fumarate (~2.4%). PMID: 15623834

Review: ferrous fumarate is bioequivalent to ferrous sulfate in adults (relative bioavailability ~100) but absorbed at only about 30% of the sulfate level in young children. PMID: 20796217