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.

MegaFood Blood Builder Minis is an iron supplement specifically designed to increase iron levels without causing common side effects like constipation. This claim is supported by an 8-week clinical trial, making it a reliable choice for those needing to boost their iron. Each serving provides 26 mg of gentle yet effective iron, complemented by essential nutrients like Vitamin C, Vitamin B12, and folic acid, which aid in red blood cell production and help combat fatigue and improve energy levels.

The tablets are vegan and suitable for various groups including menstruating women, teenage girls, pregnant women, vegans, vegetarians, athletes, and recent blood donors. They are convenient to take, with the flexibility to consume them anytime during the day, even on an empty stomach. Quality is a priority, as the product is tested for over 125 pesticides, non-GMO, and free from common allergens like gluten, dairy, and nuts.

The mini tablet form adds to its convenience, especially for those who may struggle with larger pills. However, it’s worth noting that the tablets are unflavored, which might not be appealing to everyone. Additionally, while the product is generally safe, it is not intended for children. For those seeking a vegan-friendly and clinically supported iron supplement, MegaFood Blood Builder Minis are a strong contender, though personal preferences regarding flavor and tablet size should be considered.

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.