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10 Best Iron Supplements 2025 in the United States

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Our Top Picks

#1

Winner

Doctor's Recipes Iron Supplement 65 mg with Vitamin C - Maximized Absorption, Stomach Friendly & High Potency Iron Pills for Red Blood Cells Formation & Immunity Health - Vegan Non-GMO 60 Iron Tablets

Doctor's Recipes Iron Supplement offers a high-potency dose of 65 mg of elemental carbonyl iron per tablet, which is known for its gentle absorption and fewer digestive side effects compared to ferrous salts. The inclusion of 250 mg of Vitamin C significantly aids in iron absorption, making it more effective. This supplement is also vegan, non-GMO, and free from soy, gluten, and dairy, catering to various dietary restrictions. Additionally, it is made in a GMP-certified facility in the USA, ensuring high-quality standards and third-party testing for purity and efficacy.

The tablets are designed to be easy to swallow and are marketed as stomach-friendly, which may help reduce the common side effect of constipation often associated with iron supplements. However, some users might still experience mild digestive issues, as individual tolerance can vary. This product is ideal for those looking to boost their iron levels, support their immune system, and maintain healthy red blood cell formation without experiencing significant side effects.

It is a solid choice for vegetarians, vegans, and individuals who prefer non-GMO supplements.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Side Effects
Effective at allowing the body to absorb iron without negatively affecting the stomach.
#2

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 offers a comprehensive iron supplement that seems well-suited for adults experiencing iron deficiencies. It provides 36 mg of elemental iron in each capsule using iron bisglycinate, a form known for being well-absorbed and less likely to cause constipation compared to other iron types. The inclusion of vitamin C, vitamin B6, vitamin B12, and folate enhances iron absorption and supports blood health, making it particularly effective for those dealing with symptoms like fatigue or dizziness due to iron deficiency.

The supplement is also gluten-free, a plus for those with dietary restrictions. However, while the addition of these essential nutrients is beneficial, users should be mindful of potential side effects such as gastrointestinal discomfort, which can occur with any iron supplement. Each bottle contains 60 capsules, making it easy to integrate into a daily routine.

THORNE, a trusted brand endorsed by various professional teams and partnered with the Mayo Clinic, adds a layer of credibility to the product. This supplement seems particularly beneficial for adults needing a reliable and gentle iron supplement to boost their iron levels and energy, but it's important to follow dosage recommendations to avoid adverse effects.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Form
Recommended by a functional medicine doctor, these are easy to swallow and not too large.
#3

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 - 60 Tabs

The MegaFood Blood Builder is a vegan iron supplement designed to increase iron levels without causing side effects, which makes it a gentle option for those who may experience digestive issues with other iron supplements. It contains 60 tablets, each enriched with additional nutrients such as vitamin C, vitamin B12, and folic acid. These added vitamins help support healthy red blood cell production and improve the absorption rate of iron in the body. The inclusion of beet root is another bonus, contributing to overall health benefits.

The tablets are unflavored, which might be a plus for people who are sensitive to strong tastes in supplements. However, it's important to note that individual responses to supplements can vary, so while many may not experience side effects, others might still have some digestive discomfort. Additionally, for those who require a higher daily dosage of iron, the dosage per tablet in this supplement may require them to take multiple tablets per day, which might not be convenient for everyone.

Despite these minor drawbacks, the MegaFood Blood Builder is a solid choice for those looking for a gentle, nutrient-rich iron supplement.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Side Effects
In just 50 days, my iron levels improved from 11.1 to a healthy 13.7, allowing me to donate blood again with no negative effects on my stool.

Buying Guide for the Best Iron Supplements

Choosing the right iron supplement can be crucial for addressing iron deficiency and improving overall health. Iron supplements come in various forms and strengths, and selecting the right one depends on your specific needs, health conditions, and preferences. Here are some key specifications to consider when choosing an iron supplement, along with explanations to help you make an informed decision.
Type of IronIron supplements come in different forms, such as ferrous sulfate, ferrous gluconate, and ferrous fumarate. The type of iron is important because it affects how well the supplement is absorbed and tolerated by your body. Ferrous sulfate is the most commonly used and is generally well-absorbed, but it can cause gastrointestinal side effects. Ferrous gluconate and ferrous fumarate are alternatives that may be gentler on the stomach. Choose the type that best suits your digestive tolerance and absorption needs.
DosageThe dosage of iron in supplements is measured in milligrams (mg) and indicates the amount of elemental iron you will be consuming. This is important because taking too little may not correct the deficiency, while taking too much can cause toxicity. Dosages typically range from 18 mg to 65 mg per tablet. Your healthcare provider can help determine the right dosage based on your iron levels and overall health. If you have mild deficiency, a lower dose may be sufficient, while more severe deficiencies may require higher doses.
FormIron supplements are available in various forms, including tablets, capsules, liquid, and chewable. The form is important because it can affect ease of use and absorption. Tablets and capsules are convenient and have a longer shelf life, but some people may find them hard to swallow. Liquid forms are easier to ingest and can be better absorbed, but they may have an unpleasant taste. Chewable forms are a good option for those who have difficulty swallowing pills. Choose the form that you find easiest to take consistently.
Additional NutrientsSome iron supplements include additional nutrients like vitamin C, folic acid, or vitamin B12. These nutrients can enhance iron absorption and provide other health benefits. Vitamin C, for example, significantly improves iron absorption, while folic acid and vitamin B12 are important for overall blood health. If you have specific nutritional needs or deficiencies, look for a supplement that includes these additional nutrients to maximize the benefits.
Side EffectsIron supplements can cause side effects such as constipation, nausea, and stomach cramps. The likelihood and severity of side effects can vary depending on the type and dosage of iron. It's important to consider how your body reacts to different supplements. If you experience significant side effects, you may need to try a different type or form of iron, or adjust the dosage. Your healthcare provider can help you find a supplement that minimizes side effects while effectively addressing your iron deficiency.
Absorption RateThe absorption rate of an iron supplement refers to how well your body can take in and use the iron. This is important because better absorption means more effective treatment of iron deficiency. Factors that affect absorption include the type of iron, the presence of other nutrients, and whether the supplement is taken with food. Generally, ferrous forms of iron are better absorbed than ferric forms. To maximize absorption, consider taking your supplement on an empty stomach or with vitamin C, and avoid taking it with calcium-rich foods or beverages.

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