10 Best Iron Supplements 2025 in the United States

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.

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.

The Slow Fe 45mg Iron Supplement is designed specifically for individuals with iron deficiency. It stands out due to its high potency and ease of use, with each tablet containing 45mg of iron. This makes it suitable for daily use, especially for those diagnosed with anemia. One of the significant strengths is its slow-release formulation, which helps minimize common side effects like digestive discomfort and constipation—a common issue with many iron supplements. The tablets are also easy to swallow, making the process more convenient for users.

However, it is important to note that this supplement does not include additional nutrients that some other iron supplements might offer, such as Vitamin C, which can help with iron absorption. Users will need to ensure they get these nutrients from other sources. Additionally, while the product is highly recommended by doctors and has a good reputation for efficacy, individual results may vary, and some users might still experience mild side effects. As an unflavored tablet, it may also be less appealing to those who prefer flavored supplements.

The Slow Fe 45mg Iron Supplement is a strong option for those needing a high-potency, slow-release iron supplement, but users should be mindful of their overall nutrient intake.