21st Century Iron 65 mg Review

Iron is known to be found in foods such as red meat, poultry, fish, beans, and dark leafy greens like spinach. 21st Century High Potency Iron 65 mg offers a convenient way to support adequate iron intake, especially for those with increased needs or difficulty obtaining enough from dietary sources alone. Each tablet contains 65 mg (325 mg Ferrous Sulfate) which provides 361% of your Daily Value. For over 30 years, 21st Century Vitamins has provided trusted vitamins and supplements by upholding the highest standards of quality in every product we offer. From sourcing the finest ingredients to rigorous testing and production processes, we ensure that every product meets our stringent quality benchmarks. We are here to support your wellness every step of the way. This product is not manufactured or distributed by Meda AB, owner of the registered trademark Feosol. Directions: As a mineral supplement, adults take one tablet daily with any meal or as directed by a healthcare provider. Do not exceed recommended dosage. Individual results may vary. Warnings: Iron may interfere with absorption of certain meds; these products shouldn't be taken within two hours of each other. Iron-containing products may occasionally cause constipation or diarrhea. Consult a healthcare provider prior to use if pregnant, nursing, on medications, have a medical condition or are planning a medical procedure. Stop use and contact a physician if adverse reactions occur. Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of reach of children. In case of accidental overdose, call a doctor or Poison Control Center immediately. Do not use if product appears to be tampered with or seal is broken. Store at room temperature.

Product Focus: CirculationAlso covers:Heart
Tier ⓘ
Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
Biohacker Mentions
Cost per month
$1
Study, Trial or Testing Result SummaryMembersHuman studies

11 of these 13 human studies gave iron by drip or injection, not by mouth.

This product gives 65 milligrams of iron a day, a dose compared with what was studied. That is than the daily limit, so members can take . …

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Review Totals and SummaryMembers48,317 reviews
48,317 reviews · IHerb 25,308 · 21stcenturyvitamins 10,384 · Target 10,384 · Vitacost 2,196 · Walmart 42 · EBay 2 · Clenz 1

This iron supplement, 21st Century Iron 65 mg, has received feedback, with approximately 27,505 ratings across various stores. reviews with star ratings are , giving either 4 or 5 stars. **Effectiveness** buyers report in energy and overall -being after taking these tablets. …

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Biohacker SummaryMembersWhat our biohacker panel says

The panel is split on iron, with for taking it as a supplement. Three that too much iron can damage the body, and one of them urges getting iron from food sources instead, while another against supplements and points to meats, organ meats and pumpkin seeds, citing heme iron as absorbed. …

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RAL SummaryMembersThe tier and why

Iron blood vessel function or lung artery pressure in controlled trials, the largest of 64 people with heart , and reviews are . It one tier because 3 of the biohacker panel against iron.

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More DetailsMembersBody systems · Combine with · Possible side effects

Body systems: Cardiovascular system, Blood. Combine with and possible side are for members.

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Supplement FactsIron 65 mg
Supplement Facts
Serving Size 1 Tablet
Servings Per Container 120
Amount Per Serving% Daily Value
Iron (as Dried Ferrous Sulfate)65 mg361%

Other ingredients: Cellulose, Dextrose, Sorbitol, Stearic Acid, Croscarmellose Sodium. Contains <2% of: Artificial Colors (FD&C Blue #1, FD&C Yellow #5), Magnesium Silicate, Magnesium Stearate, Polyethylene Glycol, Polyvinyl Alcohol, Silicon Dioxide, Titanium Dioxide. No Added Yeast, Preservatives or Artificial Flavors. Contains a bioengineered food ingredient.

Directions: As a mineral supplement, adults take one (1) tablet daily with any meal or as directed by a healthcare provider. Do not exceed recommended dosage.

Label source: the brand's label · Report a label change

Where to Buy21st Century · iHerb · Vitacost
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Graded October 24, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.