Mineral1 form

Ferrous Sulfate

Evidence Level

Moderate Evidence

Which Ferrous Sulfate form is best?

See our full ranked comparison — scored by absorption, bioavailability & formulary tier

Quick Answer

What is the best form of Ferrous Sulfate?

We compared 1 forms of Ferrous Sulfate in our formulary. Browse the comparison table below to find the best-absorbed form for your goals and dosing needs.

1forms compared

All Forms of Ferrous Sulfate

Form	Tier	Form Score	Dose Range	Unit
Sulfate	Mapped	75/100Strong	—	—

Absorption by Form

Strong

Sulfate

75/100

What is Ferrous Sulfate?

Ferrous Sulfate is a Mineral supplement available in 1 form.

Not all forms of Ferrous Sulfate are equal. The form you choose determines how much Ferrous Sulfate actually reaches your tissues, and the difference between the best and worst forms can be substantial. FormulaForge ranks every form by how well it absorbs and how strongly the published research supports it, giving you an evidence-based guide for choosing wisely.

Forms of Ferrous Sulfate Compared

Ferrous Sulfate (Mapped Form) has a bioavailability rating of lower absorption.

What the Research Shows

**Ferrous sulfate** is a widely used oral iron supplement primarily indicated for treating iron deficiency anemia (IDA). Clinical evidence supports its efficacy in increasing hemoglobin (Hb), serum ferritin, and serum iron levels, thereby improving anemia symptoms such as fatigue and dizziness.

Human RCT in schoolchildren: ferrous sulfate produced lower serum ferritin at 6 months than iron bisglycinate chelate. PMID: 25023784

Isotope study in preschool children: ferrous sulfate absorption (~7.9%) was greater than ferrous fumarate (~2.4%). PMID: 15623834

Human RCT (BESTIRON) in young children with iron-deficiency anemia: ferrous sulfate produced a greater hemoglobin increase than iron polysaccharide complex. PMID: 28609534

How to Choose the Right Form

Multiple forms of Ferrous Sulfate 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.

Dosing & Safety

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 Sulfate 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 Science

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

Human RCT in schoolchildren: ferrous sulfate produced lower serum ferritin at 6 months than iron bisglycinate chelate. PMID: 25023784

Isotope study in preschool children: ferrous sulfate absorption (~7.9%) was greater than ferrous fumarate (~2.4%). PMID: 15623834

Human RCT (BESTIRON) in young children with iron-deficiency anemia: ferrous sulfate produced a greater hemoglobin increase than iron polysaccharide complex. PMID: 28609534

Human RCT in pregnant women: bovine lactoferrin restored iron status as effectively as ferrous sulfate with significantly fewer gastrointestinal side effects. PMID: 19639462

Dosing Guidance

Individual dose requirements for Ferrous Sulfate vary based on health goals, body weight, and existing dietary intake. A qualified healthcare provider can help you determine an appropriate amount for you.

Frequently Asked Questions

What is the best form of Ferrous Sulfate?

Ferrous Sulfate is available in several forms. Focus on products that specify the form on the label — not all forms are equally absorbed by the body.

How much Ferrous Sulfate should I take?

Dosing for Ferrous Sulfate varies based on the specific form, your health goals, and individual factors. Consult a qualified healthcare provider for personalized guidance.

What does Ferrous Sulfate support?

Ferrous Sulfate is commonly used to support Mineral. Research suggests it plays a role in several physiological pathways. As with all supplements, these statements have not been evaluated by the Food and Drug Administration and Ferrous Sulfate is not intended to diagnose, treat, cure, or prevent any disease.

Is Ferrous Sulfate safe?

Ferrous Sulfate is generally well-tolerated when taken at research-supported doses. As with any supplement, individual responses vary. Consult a qualified healthcare provider before use, especially if you are pregnant, nursing, have a medical condition, or take medications. These statements have not been evaluated by the Food and Drug Administration.

Ready to formulate with Ferrous Sulfate?

Build your personalized formula with research-backed dosing.

Start My Formula

Compare & Learn More

All Mineral Ingredients

Compare forms and bioavailability across the mineral category

References

Human RCT in schoolchildren: ferrous sulfate produced lower serum ferritin at 6 months than iron bisglycinate chelate. PubMed
Isotope study in preschool children: ferrous sulfate absorption (~7.9%) was greater than ferrous fumarate (~2.4%). PubMed
Human RCT (BESTIRON) in young children with iron-deficiency anemia: ferrous sulfate produced a greater hemoglobin increase than iron polysaccharide complex. PubMed
Human RCT in pregnant women: bovine lactoferrin restored iron status as effectively as ferrous sulfate with significantly fewer gastrointestinal side effects. PubMed

FormulaForge formulates and sells supplements containing the ingredients discussed on this page. Our formulary recommendations are based on peer-reviewed bioavailability research. All cited studies are independently verifiable.