Iron Supplements Guide (2026): Evidence-Based Comparisons
Iron supplement forms, absorption, and tolerability — and the right pick for low ferritin or iron-deficiency anemia.
Best Iron Supplement (2026): Gentle Forms, Smart Dosing & Cost Compared
The best iron supplements ranked by form, tolerability, and cost. Why bisglycinate beats ferrous sulfate for most, the alternate-day dosing trick that improves absorption, and why you should never take iron without a confirmed deficiency.
Ferrous Sulfate vs Iron Bisglycinate: The Form Your Doctor Should Have Prescribed (2026)
Ferrous sulfate causes constipation in 25% and nausea in 20-30% of users. Iron bisglycinate has 2-3x better absorption and half the side effects. Here's why your doctor prescribed the wrong form.
Iron for Anemia & Low Ferritin (2026): How Much, How Long, How to Absorb It
How to treat iron deficiency and low ferritin: the dose that works, why alternate-day dosing absorbs better, how long it takes to refill stores, and the cause you must rule out first.
Best Iron for Women (2026): Periods, Pregnancy, and Why Women Need More
Women need more than twice the iron men do, and iron deficiency is most common in menstruating women. The right dose for periods, pregnancy, and athletes, gentle forms, and when to test.
About our data
Every comparison uses clinical evidence from PubMed systematic reviews, product label data from the NIH Dietary Supplement Label Database, and third-party certifications (USP, NSF). Products are ranked by cost per clinically-effective dose. See our methodology and editorial standards.