Best Iron Supplements of 2025

Elisa Drew Avatar
Elisa Drew
Last Updated: Jan 15, 2025

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Iron supplements are a popular form of dietary supplements that provide the body with additional iron. These supplements come in various forms, including tablets, capsules, and liquid. Iron is an essential mineral that plays a crucial role in the body's production of hemoglobin, which is responsible for transporting oxygen to the body's tissues. People who are at risk of iron deficiency or have been diagnosed with iron deficiency anemia may benefit from taking iron supplements. It is important to follow the recommended dosage and consult with a healthcare professional before starting any new supplement regimen.

At a Glance: Our Top Picks

Nature’s Bounty Iron Supplement, 100 Tablets Cover #TOP 1
Nature’s Bounty Iron Supplement, 100 Tablets
ftb score rating icon 9.8
Nature Made Iron 65 mg Tablets Cover #TOP 2
Nature Made Iron 65 mg Tablets
ftb score rating icon 9.7
Thorne Iron Bisglycinate Capsules - 25mg Cover #TOP 3
Thorne Iron Bisglycinate Capsules - 25mg
ftb score rating icon 9.5

Top 10 Iron Supplements

Nature’s Bounty Iron Supplement, 100 Tablets

Nature’s Bounty Iron Supplement, 100 Tablets Cover
Nature's Bounty Iron 65mg, 325 mg Ferrous Sulfate, Cellular Energy Support, Promotes Normal Red Blood Cell Production, 100 Tablets

Nature's Bounty Iron is a necessary component of hemoglobin, promotes normal red blood cell production, and supports energy utilization, making you feel your best. It is often recommended as a mineral supplement for women and helps provide your body with the iron it needs for daily functioning. This product is a result of 50 years of dedication to quality, consistency, and scientific research.

What We Like
Easy to swallow
Tasteless
Good quality
Affordable
Effective for iron deficiency
What We Don't Like
Large bottle size
Underfilled packaging
#TOP 2

Nature Made Iron 65 mg Tablets

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Nature Made Iron 65 mg Tablets Cover
Nature Made Iron 65 mg (from Ferrous Sulfate) Tablets for Red Blood Cell Formation (365 ct.).

Nature Made Iron Tablets provide essential support for red blood cell formation, making them a great choice for those with iron deficiency. Each bottle contains a full year's supply, so you can easily incorporate them into your daily routine. Designed specifically for adults, especially women in their reproductive years, these tablets are taken once daily with water and a meal. Plus, they are gluten-free and made without synthetic dyes or artificial flavors, ensuring a more natural supplement experience for you.

What We Like
Value size jar
Gluten free option
Helps prevent fatigue
Improves energy levels
Supports muscle function
What We Don't Like
Missing booklet on orders
#TOP 3

Thorne Iron Bisglycinate Capsules - 25mg

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

Thorne Iron Bisglycinate Capsules provide 25mg elemental iron in a non-constipating form that is well-absorbed by the body. It helps fight fatigue and other signs of iron deficiency such as weakness, dizziness, and irritability. The mineral is essential for the formation of new red blood cells, and it is certified for sport, making it ideal for high-performance nutrition programs.

What We Like
Gentle on the stomach
Small, easy-to-swallow capsules
No unpleasant side effects
Enhanced absorption with bisglycinate
What We Don't Like
Higher price point
Some mild side effects

Vitron-C High Potency Iron Supplement

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Vitron-C High Potency Iron Supplement Cover
Vitron-C Iron Supplement, Immunity Support Iron Supplements with Vitamin C, Iron Pills for Immune Support, 60 Count

Vitron-C is a high potency iron supplement that boosts energy by fighting fatigue in users with low iron levels. Its 65mg of elemental iron and 125mg of Vitamin C support a healthy immune system and gentle iron absorption to minimize constipation, using one iron pill daily. It is dye-free, gluten-free, vegan with no artificial colors or flavors.

What We Like
Effective for low iron
Easy on the stomach
Includes Vitamin C
Improved energy levels
Smaller pill size
What We Don't Like
Pill burp with taste
Possible constipation

MegaFood Blood Builder - Iron Supplement

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MegaFood Blood Builder - Iron Supplement Cover
MegaFood Blood Builder - Iron Supplement Clinically Shown to Increase Iron Levels without Side Effects - Iron Supplement for Women with Vitamin C, Vitamin B12 and Folic Acid - Vegan - 90 Tabs

The MegaFood Blood Builder is an iron supplement that increases iron levels without causing nausea or constipation. It contains vital nutrients, such as vitamin C and beet root, along with nourishing ingredients like folic acid and vitamin B12 that promote healthy red blood cell production. The supplement uses real food and added nutrients to ensure better health starts with nature. MegaFood is also obsessed with quality, making sure every ingredient is of the highest standard.

What We Like
Improves energy and stamina
Supports hair health
No constipation issues
Easy-to-take capsule
Vegan and slow-release formula
What We Don't Like
Effectiveness varies by individual
Price may be high for some
#TOP 6

Slow Fe 45mg Iron Supplement - 60 Count

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

Slow Fe 45mg Iron Supplement is a high-potency, slow-release iron tablet that is easy to swallow and formulated for daily use. It is a non-constipating iron supplement, designed to reduce digestive side effects. Doctors recommend this product as a treatment for iron deficiency anemia. The special controlled release system delivers iron slowly to your body, causing fewer digestive side effects. Take one tablet every day to increase your iron intake.

What We Like
Slow release minimizes side effects
Improves iron levels effectively
No constipation or nausea
Easy on the stomach
Long-term positive results
What We Don't Like
Dark stools expected
#TOP 7

Pure Encapsulations Iron-C Supplement

Pure Encapsulations Iron-C Supplement Cover
Pure Encapsulations Iron-C - 15 mg Iron - 175 mg Vitamin C - Red Blood Cell Support* - Energy Production - Highly Bioavailable Iron Pill - Gluten Free & Vegan - 60 Capsules

Pure Encapsulations Iron-C Supplement is a premium quality iron and vitamin C supplement that supports optimal muscle function, manufacture of myoglobin for muscle contractions, enhanced absorption of iron, and immune support. The product is made with only premium ingredients sourced from trusted suppliers, and it is free from wheat, eggs, tree nuts & peanuts, gluten, GMOs, and unnecessary binders, fillers & preservatives.

What We Like
Tasteless for sensitive individuals
Includes vitamin C for absorption
Improves energy levels
No stomach issues reported
Effective for iron deficiency
What We Don't Like
Large capsule size

Iron Ferrous Sulfate 65 mg | 400 Tablets | Non-GMO, Gluten Free, and Vegetarian Supplement | High Potency

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Iron Ferrous Sulfate 65 mg | 400 Tablets | Non-GMO, Gluten Free, and Vegetarian Supplement | High Potency Cover
Carlyle Iron Ferrous Sulfate 365mg, 65 mg | 400 Tablets | Non-GMO, Gluten Free, and Vegetarian Supplement | High Potency

The Carlyle Iron Ferrous Sulfate supplement provides 65 mg of elemental iron per serving in coated tablets for maximum absorption. As a non-GMO, gluten-free, and vegetarian supplement, it is naturally free of gluten, wheat, yeast, lactose, soy, artificial flavor, and preservatives. Carlyle is dedicated to providing premium, honest supplements to support your journey towards healthy living.

What We Like
Effective for iron deficiency
No side effects
Fast results in two days
High-quality packaging
Long-term use appreciated
What We Don't Like
May require higher dosage when losing weight
#TOP 9

MegaFood Blood Builder Minis - Iron Supplement Vegan - 72 Tabs (36 Servings)

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MegaFood Blood Builder Minis - Iron Supplement Vegan - 72 Tabs (36 Servings) Cover
MegaFood Blood Builder Minis - Iron Supplement Clinically Shown to Increase Iron Levels Without Side Effects - Iron with Vitamin C, Vitamin B12 & Folic Acid - Vegan - 72 Tablets (36 Servings)

MegaFood Blood Builder Minis is an iron supplement that can increase iron levels in your body without causing nausea or constipation. It delivers 26 mg of iron and includes folic acid and B12 for healthy red blood cell production. The product is safe for menstruating and pregnant women, teenage girls, vegans, and vegetarians. It is crafted using Slo-Food Process and includes Beet Root and Vitamin C delivered with natural oranges to aid absorption. The supplement is non-GMO Project Verified, free of gluten, dairy, and soy, and certified kosher. MegaFood works with trusted farm partners who share their commitment to natural and regenerative agriculture.

What We Like
Boosts energy levels
Gentle on stomach
Easy to swallow
All-natural ingredients
Vegan-friendly
What We Don't Like
Some may experience mild stomach discomfort
Taste not appealing to all
#TOP 10

Thorne Ferrasorb - Blood-Building Formula - 60 Capsules

SF750
Thorne Ferrasorb - Blood-Building Formula - 60 Capsules Cover
THORNE Ferrasorb - 36 mg Iron with Essential Nutrients - Complete Blood Support Formula - Elemental Iron, Folate, B and C Vitamins for Optimal Absorption - Gluten-Free - 60 Capsules

Thorne Ferrasorb is an optimal blood-building supplement that provides 36 mg of well-absorbed iron per capsule, combined with essential nutrients such as vitamin C, B6, B12, and folate for optimal absorption. This supplement helps to increase iron levels and alleviate symptoms of iron deficiency, such as fatigue, dizziness, and loss of libido. Thorne Ferrasorb is free from common allergens like gluten, soy, and dairy, and is trusted by over 100 pro teams and 11 U.S. Olympic teams.

What We Like
Improved iron levels
Affordable quality
Easy to swallow
No stomach issues
Increased energy
What We Don't Like
Some digestive discomfort
Buying Guide Image

Decide Which Iron Supplements Are Best for You

Iron is an essential mineral that plays a crucial role in many bodily functions, including the transport of oxygen in the blood and the production of collagen. If you're not getting enough iron in your diet, you may be at risk of developing anemia, a condition characterized by low levels of red blood cells. To avoid this, some people may choose to take iron supplements. But with so many different options on the market, it can be difficult to know which one is right for you. Here are a few tips to help you choose the best iron supplement for your needs.

Consider the form of the supplement

Iron supplements are available in a variety of forms, including tablets, capsules, and liquid drops. The form you choose may depend on your personal preference, as well as any digestive issues you may have. For example, if you have difficulty swallowing pills, liquid drops may be a better option for you.

Pay attention to the type of iron

There are two main types of iron used in supplements: ferrous and ferric. Ferrous iron is more easily absorbed by the body, making it the more common choice in supplements. Ferric iron, on the other hand, is less easily absorbed and may cause constipation or other digestive issues. If you have trouble tolerating ferrous iron, you may want to try a supplement that contains ferric iron instead.

Check the dosage

Iron supplements come in different dosages, so it's important to choose one that is appropriate for your needs. The recommended daily allowance of iron for adult men is 8 milligrams per day, while for adult women it is 18 milligrams per day. However, if you're pregnant or breastfeeding, you may need more. It's always a good idea to talk to your doctor before starting any new supplement to make sure you're taking the right amount.

Be aware of potential side effects

Iron supplements can cause side effects, including nausea, stomach pain, and constipation. To avoid these, it's important to take the supplement with food and to start with a low dose, gradually increasing it over time. If you experience any adverse effects, stop taking the supplement and talk to your doctor.

Choose a reputable brand

When it comes to choosing a supplement, it's important to choose a reputable brand. Look for a brand that is transparent about its ingredients and manufacturing processes, and one that has a good track record with its customers. You can also check online reviews to see what other people have to say about the brand you're considering.

Talk to your doctor

Ultimately, the best person to help you choose the right iron supplement is your doctor. They can assess your individual needs and make a recommendation based on your medical history and other factors. So, if you're considering taking an iron supplement, make sure to talk to your doctor first.

In conclusion, choosing the right iron supplement can help you avoid the potential risks of iron deficiency, such as anemia. By considering the form, type, dosage, and potential side effects, as well as choosing a reputable brand and talking to your doctor, you can find the right supplement for your needs.

Frequently Asked Questions (FAQs)

1. Is it OK to take an iron supplement every day?

Some doctors may recommend taking iron supplements daily, while others suggest taking them every other day for better absorption. It is important to discuss with your doctor, especially if you have iron deficiency anemia, to determine the appropriate dosage and ensure you are getting the necessary amount of iron.

2. What is the best form of iron to take?

Ferrous sulfate is considered the most easily absorbed form of iron. When choosing an iron supplement, it is also important to check the label for the amount of 'elemental iron,' which is the total amount of iron that your body can potentially absorb.

3. What is the downside of taking iron pills?

Taking iron pills can sometimes cause stomach cramps, nausea, and diarrhea in certain individuals. To minimize these side effects, it is recommended to take iron supplements with a small amount of food.

4. Is 65 mg of iron a day too much?

High doses of iron can be toxic. The upper limit of iron intake for adults and children aged 14 and up is 45 mg per day. For children under the age of 14, the recommended upper limit is 40 mg per day.

5. How can I boost my iron levels quickly?

To quickly boost your iron levels, you can include iron-rich foods in your diet such as red meat, pork, poultry, seafood, beans, dark green leafy vegetables (e.g., spinach), dried fruits (e.g., raisins and apricots), iron-fortified cereals, breads, and pastas, as well as peas.

6. What happens to your body when you start taking iron pills?

When you start taking iron pills, you may experience stomach problems like heartburn, nausea, diarrhea, constipation, and cramps. It is important to stay hydrated and consume fruits, vegetables, and fiber to help alleviate these symptoms. Additionally, iron pills can cause a change in the color of your stool, turning it greenish or grayish black, which is normal.

Editor's Notes

During our iron supplement research, we found 24 iron supplement products and shortlisted 10 quality products. We collected and analyzed 514,815 customer reviews through our big data system to write the iron supplements list. We found that most customers choose iron supplements with an average price of $19.41.

The iron supplements are available for purchase. We have researched hundreds of brands and picked the top brands of iron supplements, including Nature's Bounty, Nature Made, THORNE, Vitron-C, MegaFood. The seller of top 1 product has received honest feedback from 385 consumers with an average rating of 4.7.

Written by
Elisa Drew Avatar

Elisa Drew is a really professional copywriter specializing in baby products with five years of experience working as a pediatrician once. She has published a series of baby books purchased by over thirty thousand people in the United States.

Iron Supplements Comparison Table

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Brand Nature's Bounty Nature Made THORNE Vitron-C MegaFood Slow Fe Pure Encapsulations Carlyle MegaFood THORNE
Item Form Tablets Tablets capsules Tablet Tablet Tablet Capsule Tablet Tablet Capsule
Unit Count 100 Count 365.0 Count 60.0 Count 60 Count 90 Count 60 Count 60.00 Count 400.00 Count 72 Count 60.0 Count
Flavor Unflavored Iron 65 mg Unflavored Unflavored Unflavored Unflavored Unflavored Unflavored Unflavored Unflavored
Primary Supplement Type Iron Vitamin Iron Helps body absorb dietary iron Easy on the stomach, less constipation Iron Iron Vitamin C, Iron Iron Iron -
FTB Score
ftb score rating icon 9.8
ftb score rating icon 9.7
ftb score rating icon 9.5
ftb score rating icon 9.5
ftb score rating icon 9.5
ftb score rating icon 9.4
ftb score rating icon 9.3
ftb score rating icon 9.2
ftb score rating icon 9.0
ftb score rating icon 8.8
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