July 16, 2025

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10 Best tolerated iron supplements of 2025

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Best Choice

1

MegaFood
MegaFood Blood Builder Iron Supplement Clinically Shown to Increase Iron Levels Without Side Effects, Vegan Supplement For Women with Vitamin C, Vitamin B12 & Folic Acid, 90 Tablets
Main highlights

Clinically Proven Iron Boost
Gentle Iron Tablets clinically shown to increase iron levels without side effects.

Ideal for Iron Deficiency
Perfect for individuals needing an iron boost, especially women.

No Side Effects
Widely praised for increasing energy without adverse reactions.
Key specs
- Formulation:Tablets with vitamin C
- Bioavailability:Clinically shown
- Elemental Iron:Clinically shown
- Serving Size:N/A
- Dietary Restrictions:N/A
9.9

Exceptional

Our Rating

9.7
quality of ingredients

9.5
worth the money

9.3
Absorbency
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Value for Money

2

NovaFerrum
NovaFerrum Wow | 125 High Potency Liquid Iron Supplement | Liquid Iron for Adults | Iron Deficiency | 125mg of Iron Per 5mL Dose | Vegan Verified | Gluten Free Certified | Sugar Free
Main highlights

High-Potency Liquid Iron
Delivers 125mg of iron per 5mL dose, boosting iron levels effectively.

Ideal for Iron Deficiency
Perfect for adults with anemia or low iron, offering quick absorption.

Gentle and Effective
Praised for being easy on the stomach and improving energy levels.
Key specs
- Formulation:Liquid
- Bioavailability:Quick absorption
- Elemental Iron:125mg
- Serving Size:5mL
- Dietary Restrictions:Vegan, Gluten-Free, Kosher, Halal
9.8

Exceptional

Our Rating

9.3
Absorbency

9.1
simple to consume

8.0
Flavor
3

NOW Foods
NOW Foods Supplements, Iron 18 mg, Non-Constipating*, Essential Mineral, 120 Veg Capsules

45% Off
Main highlights

Superior Absorption and Tolerance
NOW Supplements uses Ferrochel Iron Bisglycinate for superior absorption and is gentle on the stomach, minimizing constipation.

Ideal for Controlled Iron Intake
Perfect for those needing precise iron supplementation, with 18 mg per capsule to avoid overdose risks.

Praised for Non-Constipating Formula
Customers appreciate its non-constipating properties, making it a preferred choice for iron supplementation.
9.7

Exceptional

Our Rating

9.7
simple to consume

9.7
quality of ingredients

9.5
worth the money
4

THORNE
THORNE Iron Bisglycinate - 25 mg Iron Supplement for Enhanced Absorption Without Gastrointestinal Side Effects* - NSF Certified for Sport - Gluten-Free - 60 Capsules
Main highlights

Enhanced Absorption Without Side Effects
Provides 25 mg of elemental iron in a non-constipating, well-absorbed form, minimizing gastrointestinal side effects.

Ideal for Athletes and Active Individuals
NSF Certified for Sport, suitable for high-performance nutrition programs and trusted by professional sports teams.

Stomach-Friendly Iron Supplement
Customers appreciate the lack of digestive issues and unpleasant aftertaste compared to other iron supplements.
9.6

Exceptional

Our Rating

9.7
simple to consume

9.3
Absorbency

9.3
Flavor
5

NOW Foods
NOW Supplements, Iron 36 mg, Double Strength, Non-Constipating*, Essential Mineral, 90 Veg Capsules

46% Off
Main highlights

Essential Mineral Benefits
Iron is crucial for energy, immune, and neurological health.

Ideal for Sensitive Digestion
Ferrochel Iron Bisglycinate is gentle and non-constipating.

Customer Praised Easy Consumption
Capsules are easy to swallow with little to no taste.
9.5

Excellent

Our Rating

9.7
simple to consume

9.7
Flavor

9.5
worth the money
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6

Slow Fe
Slow Fe 45mg Iron Supplement for Iron Deficiency, Slow Release, High Potency, Easy to Swallow Tablets - 60 Count

10% Off
Main highlights

High Potency Iron Supplement
Slow Fe offers a high potency 45mg iron supplement for effective daily use, reducing iron deficiency symptoms.

Ideal for Iron Deficiency and Anemia
Best suited for individuals with iron deficiency or anemia, providing a controlled release formula to minimize stomach discomfort.

Praised for Gentle Digestion
Customers frequently praise Slow Fe for its non-constipating formula and easy-to-swallow tablets, ensuring a comfortable user experience.
Key specs
- Formulation:Tablet
- Bioavailability:Controlled release
- Elemental Iron:45mg
- Serving Size:N/A
- Dietary Restrictions:Non constipating
9.4

Excellent

Our Rating

9.7
simple to consume

9.3
worth the money

9.3
Absorbency
7

Designs for Health
Designs for Health Ferrochel Chelated Iron - Highly-Absorbable Iron Supplement for Women & Men as Ferrous Bisglycinate Chelate - Iron Pills Safe for Pregnant Women & Teens (120 Vegan Iron Capsules)
Main highlights

Gentle Iron Supplement
Ferrochel uses Iron bisglycinate for 27 mg per capsule, supporting energy and immunity.

Ideal for Sensitive Stomachs
Perfect for those needing iron without gastric discomfort or constipation.

Highly Absorbable and Effective
Praised for improving iron levels without side effects like taste or stomach issues.
Key specs
- Formulation:Iron bisglycinate
- Bioavailability:Well tolerated
- Elemental Iron:27 mg
- Serving Size:27 mg per capsule
- Dietary Restrictions:Vegan, Non-GMO
9.3

Excellent

Our Rating

9.9
quality of ingredients

9.7
simple to consume

9.5
Absorbency
8

NovaFerrum
NovaFerrum Yummy | Pediatric Drops Liquid Iron Supplement for Infants and Toddlers | Liquid Iron for Kids | 15mg of Iron Per 1mL Dose | Ages 4 & Under | Gluten Free Certified | Sugar-Free | Raspberry
Main highlights

Key Features and Benefits
Clinically proven effective, NovaFerrum offers a safe, well-tolerated 15 mg iron dose per mL, free from gluten, sugar, and synthetic additives.

Ideal Use Cases
Perfect for kids or anyone needing to boost iron levels, easily mixed with food or drinks, offering a pleasant taste without the iron aftertaste.

Customer Reviews Highlight
Most praised for its great taste and effectiveness, NovaFerrum is frequently highlighted as a kid-friendly solution to iron deficiency.
Key specs
- Formulation:Liquid
- Bioavailability:Clinically proven effective
- Elemental Iron:15 mg
- Serving Size:1 mL
- Dietary Restrictions:No gluten, sugar, alcohol
9.2

Excellent

Our Rating

8.9
Absorbency

8.7
simple to consume

8.4
Flavor
9

Feosol
Feosol Complete Iron Supplement Caplets, Bifera Iron for High Absorption, Heme and Non-Heme Dual Action Minimizes Side Effects, 1 Per Day, for Energy and Immune System Support, Made in USA, 30 Count

27% Off
Main highlights

High Absorption Dual Iron
Combines heme and non-heme iron for enhanced absorption and minimal side effects.

Ideal for Iron Deficiency
Perfect for those with anemia or iron deficiency seeking gentle supplementation.

Gentle on Stomach
Praised for causing no nausea or gastrointestinal issues as per user reviews.
Key specs
- Formulation:Caplet
- Bioavailability:Enhanced absorption
- Elemental Iron:N/A
- Serving Size:One caplet
- Dietary Restrictions:N/A
9.1

Excellent

Our Rating

9.9
simple to consume

9.5
Absorbency

9.5
Flavor
10

Feosol
Feosol Original Iron Supplement Tablets, Non-heme, 325mg Ferrous Sulfate (65mg Elemental Iron) per Iron Pill, 1 Per Day, 120ct, 4 Month Supply, for Energy and Immune System Support, Made in USA

20% Off
Main highlights

High Potency Iron Support
Feosol Original offers 65 mg elemental iron per tablet, supporting red blood cell production and energy levels.

Daily Use for Energy
Ideal for those needing daily iron intake to boost energy and immune health.

Praised Effectiveness
Customers report noticeable improvement in energy and reduced fatigue with consistent use.
Key specs
- Formulation:Ferrous Sulfate
- Bioavailability:High potency
- Elemental Iron:65 mg
- Serving Size:1 tablet
- Dietary Restrictions:N/A
8.8

Very Good

Our Rating

9.9
simple to consume

9.5
worth the money

9.5
Absorbency

10 Best tolerated iron supplements of 2025

1

MegaFood Blood Builder Iron Supplement Clinically Shown to Increase Iron Levels Without Side Effects, Vegan Supplement For Women with Vitamin C, Vitamin B12 & Folic Acid, 90 Tablets

9.7

9.5

9.3

How do we rank?

How do we rank?

Analyzing top stores

2

NovaFerrum Wow | 125 High Potency Liquid Iron Supplement | Liquid Iron for Adults | Iron Deficiency | 125mg of Iron Per 5mL Dose | Vegan Verified | Gluten Free Certified | Sugar Free

9.3

9.1

8.0

3

NOW Foods Supplements, Iron 18 mg, Non-Constipating*, Essential Mineral, 120 Veg Capsules

9.7

9.7

9.5

4

THORNE Iron Bisglycinate - 25 mg Iron Supplement for Enhanced Absorption Without Gastrointestinal Side Effects* - NSF Certified for Sport - Gluten-Free - 60 Capsules

9.7

9.3

9.3

5

NOW Supplements, Iron 36 mg, Double Strength, Non-Constipating*, Essential Mineral, 90 Veg Capsules

9.7

9.7

9.5

6

Slow Fe 45mg Iron Supplement for Iron Deficiency, Slow Release, High Potency, Easy to Swallow Tablets - 60 Count

9.7

9.3

9.3

7

Designs for Health Ferrochel Chelated Iron - Highly-Absorbable Iron Supplement for Women & Men as Ferrous Bisglycinate Chelate - Iron Pills Safe for Pregnant Women & Teens (120 Vegan Iron Capsules)

9.9

9.7

9.5

8

NovaFerrum Yummy | Pediatric Drops Liquid Iron Supplement for Infants and Toddlers | Liquid Iron for Kids | 15mg of Iron Per 1mL Dose | Ages 4 & Under | Gluten Free Certified | Sugar-Free | Raspberry

8.9

8.7

8.4

9

Feosol Complete Iron Supplement Caplets, Bifera Iron for High Absorption, Heme and Non-Heme Dual Action Minimizes Side Effects, 1 Per Day, for Energy and Immune System Support, Made in USA, 30 Count

9.9

9.5

9.5

10

Feosol Original Iron Supplement Tablets, Non-heme, 325mg Ferrous Sulfate (65mg Elemental Iron) per Iron Pill, 1 Per Day, 120ct, 4 Month Supply, for Energy and Immune System Support, Made in USA

9.9

9.5

9.5

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