Updated:March, 2026

10 Best Methylated Iron Supplement of 2026

Best Choice

9.9

Outstanding

NAKED

Naked Iron 65mg, 325mg Ferrous Bisglycinate - High Potency Iron Supplement for Iron Deficiency, Cellular Energy Support, Promotes Healthy Red Blood Cell Production, Non-GMO, Gluten-Free, 60 Capsules

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Why We Love It

WELL-ABSORBED IRON: 65mg as Ferrous Bisglycinate has high bioavailabilty and better absorption than ferrous sulfate which is the least expensive and most common type of iron supplement. Iron bisglycinate is also associated with less stomach intolerance.
BLOOD SUPPORT: Iron is an essential mineral for the formation of new blood cells and ferrous bisglycinate shows some benefit over other iron supplements in increasing hemoglobin and ferritin levels.
INCREASE IRON LEVELS: Symptoms of iron deficiency include fatigue, weakness, pale or yellow "sallow" skin, shortness of breath especially with activity, dizziness, rapid heart beat, tinnitus, drowsiness, irritability, infrequent menstruation, and loss of libido. *Note: Daily values are what the U.S. Government determined as the amount just over what is needed to keep from developing a specific nutrient-deficiency disease. The optimal amount to make a difference in your health is often much higher than the government value.
VEGAN IRON SUPPLEMENT: Vegan, GMO Free, Gluten Free and Made in the USA. Capsule size 00 = 23.4mm length and 8.53mm diameter. Adults, for iron deficiency take 1 capsule daily with water and a meal.
THE NAKED DIFFERENCE: Founded over 10 years ago to help support your health and fitness goals by sourcing premium ingredients, using as few of them as possible and being transparent so you know exactly what's going into your body.

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Why We Love It

WELL-ABSORBED IRON: 65mg as Ferrous Bisglycinate has high bioavailabilty and better absorption than ferrous sulfate which is the least expensive and most common type of iron supplement. Iron bisglycinate is also associated with less stomach intolerance.
BLOOD SUPPORT: Iron is an essential mineral for the formation of new blood cells and ferrous bisglycinate shows some benefit over other iron supplements in increasing hemoglobin and ferritin levels.
INCREASE IRON LEVELS: Symptoms of iron deficiency include fatigue, weakness, pale or yellow "sallow" skin, shortness of breath especially with activity, dizziness, rapid heart beat, tinnitus, drowsiness, irritability, infrequent menstruation, and loss of libido. *Note: Daily values are what the U.S. Government determined as the amount just over what is needed to keep from developing a specific nutrient-deficiency disease. The optimal amount to make a difference in your health is often much higher than the government value.
VEGAN IRON SUPPLEMENT: Vegan, GMO Free, Gluten Free and Made in the USA. Capsule size 00 = 23.4mm length and 8.53mm diameter. Adults, for iron deficiency take 1 capsule daily with water and a meal.
THE NAKED DIFFERENCE: Founded over 10 years ago to help support your health and fitness goals by sourcing premium ingredients, using as few of them as possible and being transparent so you know exactly what's going into your body.

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9.5

Excellent

THORNE

THORNE - Iron Bisglycinate - 25 mg Iron Supplement for Enhanced Absorption Without Gastrointestinal Side Effects* - NSF Certified for Sport - Gluten-Free - 60 Servings

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Main Highlights

Well-Absorbed Iron: Provides 25 mg of elemental iron per capsule in a non-constipating, well-absorbed form as iron bisglycinate
Symptoms of Low Iron: Nearly 1 in 3 adults in the U.S. may have low iron levels, which can manifest as weakness, fatigue, shortness of breath, dizziness, drowsiness, irritability, infrequent menstruation, and more
Blood Support: Dietary iron is essential for the formation of new red blood cells, especially important for women of childbearing age, after blood loss from surgery/injury, or for those who follow vegan/vegetarian diets*
NSF Certified for Sport: Tested for compliance with label claims and to ensure the absence of nearly 300 substances banned by many major athletic organizations
Trusted: Thorne is chosen by champions and trusted by 100+ professional sports teams, a proud partner of U.S. National Teams, and the #1 recommended clinical brand by health-care practitioners (2023 Health-Care Practitioner Seller Survey)

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Main Highlights

Well-Absorbed Iron: Provides 25 mg of elemental iron per capsule in a non-constipating, well-absorbed form as iron bisglycinate
Symptoms of Low Iron: Nearly 1 in 3 adults in the U.S. may have low iron levels, which can manifest as weakness, fatigue, shortness of breath, dizziness, drowsiness, irritability, infrequent menstruation, and more
Blood Support: Dietary iron is essential for the formation of new red blood cells, especially important for women of childbearing age, after blood loss from surgery/injury, or for those who follow vegan/vegetarian diets*
NSF Certified for Sport: Tested for compliance with label claims and to ensure the absence of nearly 300 substances banned by many major athletic organizations
Trusted: Thorne is chosen by champions and trusted by 100+ professional sports teams, a proud partner of U.S. National Teams, and the #1 recommended clinical brand by health-care practitioners (2023 Health-Care Practitioner Seller Survey)

9.5

Excellent

THORNE

THORNE - Advanced Iron Complex (Formerly Ferrasorb) - Complete Blood Support Formula* - Elemental Iron, Folate, B and C Vitamins for Optimal Absorption - Gluten, Dairy & Soy-Free - 60 Servings

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Main Highlights

Well-Absorbed Iron: Provides 36 mg of elemental iron per capsule in a well-absorbed, non-constipating form as iron bisglycinate, with B vitamins and vitamin C to enhance irons absorption*
Iron Plus B Vitamins: A nourishing supplement that combines vitamins B6 (pyridoxal 5'-phosphate), B12 (methylcobalamin), and B9 (folate as L-5-MTHF) with well-absorbed iron bisglycinate
Symptoms of Low Iron: Nearly 1 in 3 adults in the U.S. may have low iron levels, which can manifest as weakness, fatigue, shortness of breath, dizziness, drowsiness, irritability, infrequent menstruation, and more
4 Rounds of Testing: Our state-of-the-art laboratories enable us to conduct 4 rounds of testing on every product, from analyzing the purity of raw materials to confirming the shelf life of finished formulas
Trusted: Thorne is chosen by champions and trusted by 100+ professional sports teams, a proud partner of U.S. National Teams, and the #1 recommended clinical brand by health-care practitioners (2023 Health-Care Practitioner Seller Survey)

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Main Highlights

Well-Absorbed Iron: Provides 36 mg of elemental iron per capsule in a well-absorbed, non-constipating form as iron bisglycinate, with B vitamins and vitamin C to enhance irons absorption*
Iron Plus B Vitamins: A nourishing supplement that combines vitamins B6 (pyridoxal 5'-phosphate), B12 (methylcobalamin), and B9 (folate as L-5-MTHF) with well-absorbed iron bisglycinate
Symptoms of Low Iron: Nearly 1 in 3 adults in the U.S. may have low iron levels, which can manifest as weakness, fatigue, shortness of breath, dizziness, drowsiness, irritability, infrequent menstruation, and more
4 Rounds of Testing: Our state-of-the-art laboratories enable us to conduct 4 rounds of testing on every product, from analyzing the purity of raw materials to confirming the shelf life of finished formulas
Trusted: Thorne is chosen by champions and trusted by 100+ professional sports teams, a proud partner of U.S. National Teams, and the #1 recommended clinical brand by health-care practitioners (2023 Health-Care Practitioner Seller Survey)

9.2

Excellent

Pure Encapsulations

Pure Encapsulations Iron-C - 15 mg - 175 mg Vitamin C - Red Blood Cell Support* - Energy Production - Highly Bioavailable Iron Pill - Gluten Free & Vegan - 60 Capsules

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Main Highlights

Iron Vitamin Synergy: Each Iron-C capsule combines 15 mg of iron (as iron glycinate and iron aspartate) with 175 mg of vitamin C for optimal absorption
Red Blood Cell Support: Iron-C minerals supplement supports red blood cell production and health, as well as support muscle function*
Highly Bioavailable Iron Pill: Iron glycinate and iron aspartate are highly bioavailable forms of iron, supporting absorption
Suggested Use: As a dietary supplement, take 1 iron glycinate capsule, 1-2 times daily, with meals
Pure Difference: What we leave out matters, too; Pure Encapsulations products are FREE FROM common allergens, artificial or unnecessary ingredients, and GMOs

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Main Highlights

Iron Vitamin Synergy: Each Iron-C capsule combines 15 mg of iron (as iron glycinate and iron aspartate) with 175 mg of vitamin C for optimal absorption
Red Blood Cell Support: Iron-C minerals supplement supports red blood cell production and health, as well as support muscle function*
Highly Bioavailable Iron Pill: Iron glycinate and iron aspartate are highly bioavailable forms of iron, supporting absorption
Suggested Use: As a dietary supplement, take 1 iron glycinate capsule, 1-2 times daily, with meals
Pure Difference: What we leave out matters, too; Pure Encapsulations products are FREE FROM common allergens, artificial or unnecessary ingredients, and GMOs

9.0

Excellent

MegaFood

MegaFood Blood Builder Iron Supplement for Women & Men - Increase Iron Levels Without Side Effects - Combats Fatigue - Vitamin B12, Folic Acid & Vitamin C - Vegan - 72 Mini Tablets (36 Servings)

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Main Highlights

INCREASES IRON LEVELS: MegaFood Blood Builder was shown in a 8 week clinical trial to increase iron levels without constipation; an effective and gentle iron with vitamin C source that can be used as an iron supplement for women+
SUPPORTS RED BLOOD CELL PRODUCTION: These iron supplements for women include folic acid and B12 which help maintain red blood cell production and delivers a gentle and effective 26 mg of iron per serving to combat fatigue and improve energy levels+
GENTLE & CONVENIENT FORMULA: Blood Builder can be used as iron tablets for women, teenage girls, pregnant women, menstruating women, vegans, vegetarians, athletes, and recent blood donors; Convenient mini tablets
FLEXIBLE DOSAGE: Take 2 tablets any time of day with a beverage, even on an empty stomach; This iron supplement is suitable for vegan diets; Not intended for children
COMMITTED TO QUALITY: Tested for 150 chemical substances. Non-GMO Project verified, vegan, and kosher; The iron vitamin tablets are made without gluten, dairy, eggs, tree nuts, peanuts, soy, fish, shellfish or sesame in a GMP facility

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Main Highlights

INCREASES IRON LEVELS: MegaFood Blood Builder was shown in a 8 week clinical trial to increase iron levels without constipation; an effective and gentle iron with vitamin C source that can be used as an iron supplement for women+
SUPPORTS RED BLOOD CELL PRODUCTION: These iron supplements for women include folic acid and B12 which help maintain red blood cell production and delivers a gentle and effective 26 mg of iron per serving to combat fatigue and improve energy levels+
GENTLE & CONVENIENT FORMULA: Blood Builder can be used as iron tablets for women, teenage girls, pregnant women, menstruating women, vegans, vegetarians, athletes, and recent blood donors; Convenient mini tablets
FLEXIBLE DOSAGE: Take 2 tablets any time of day with a beverage, even on an empty stomach; This iron supplement is suitable for vegan diets; Not intended for children
COMMITTED TO QUALITY: Tested for 150 chemical substances. Non-GMO Project verified, vegan, and kosher; The iron vitamin tablets are made without gluten, dairy, eggs, tree nuts, peanuts, soy, fish, shellfish or sesame in a GMP facility

8.8

Very Good

MegaFood

MegaFood Blood Builder Iron Supplement for Women & Men - Increase Iron Levels Without Side Effects - Combats Fatigue - with Vitamin B12, Folic Acid & Vitamin C for Absorption - Vegan - 90 Tablets

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Main Highlights

INCREASES IRON LEVELS: MegaFood Blood Builder was shown in a 8 week clinical trial to increase iron levels without constipation; Effective and gentle iron with vitamin C
SUPPORTS RED BLOOD CELL PRODUCTION: These iron supplements for women include folic acid and B12 which help maintain red blood cell production and delivers a gentle and effective 26 mg of iron per serving to combat fatigue and improve energy levels
GENTLE & CONVENIENT FORMULA: Blood Builder can be used as iron tablets for women, teenage girls, pregnant women, menstruating women, vegans, vegetarians, athletes, and recent blood donors.
FLEXIBLE DOSAGE: Take 1 tablet any time of day with a beverage, even on an empty stomach; This new option for iron is suitable for vegan diets, Not intended for children
COMMITTED TO QUALITY: Tested for 150 chemical substances, The iron vitamin tablets are non-GMO Project verified and Vegan

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Main Highlights

INCREASES IRON LEVELS: MegaFood Blood Builder was shown in a 8 week clinical trial to increase iron levels without constipation; Effective and gentle iron with vitamin C
SUPPORTS RED BLOOD CELL PRODUCTION: These iron supplements for women include folic acid and B12 which help maintain red blood cell production and delivers a gentle and effective 26 mg of iron per serving to combat fatigue and improve energy levels
GENTLE & CONVENIENT FORMULA: Blood Builder can be used as iron tablets for women, teenage girls, pregnant women, menstruating women, vegans, vegetarians, athletes, and recent blood donors.
FLEXIBLE DOSAGE: Take 1 tablet any time of day with a beverage, even on an empty stomach; This new option for iron is suitable for vegan diets, Not intended for children
COMMITTED TO QUALITY: Tested for 150 chemical substances, The iron vitamin tablets are non-GMO Project verified and Vegan

8.6

Very Good

Nature's Bounty

Nature’s Bounty Iron 65mg, 325 mg Ferrous Sulfate, Cellular Energy Support, Promotes Normal Red Blood Cell Production, 1 Serving Per Day, Gluten Free, 100 Vegetarian Tablets

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Main Highlights

A NECESSARY COMPONENT OF HEMOGLOBIN Iron is a necessary component of hemoglobin; the oxygen carrier responsible for delivering oxygen to the cells; including muscle cells (1); Natures Bounty Iron helps promote normal red blood cell production (1)
HELPS MAINTAIN ENERGY UTILIZATION (1) Iron supports energy utilization; helping you to feel your best (1)
SUPPORTS WOMENS HEALTH (1) Everyone needs Iron; but pregnancy and menstruation may increase Iron requirements; Often recommended as a mineral supplement for women; Natures Bounty Iron offers the daily nutritional support you need (1)
NECESSARY FOR OVERALL HEALTH Taking a daily Iron supplement with Ferrus Sulfate helps provide your body with the iron it needs for daily functioning (1)
FROM THE TRUSTED WELLNESS EXPERTS Natures Bounty Iron is a product of 50 years of dedication to quality; consistency and scientific research to make vitamins and nutritional supplements of unrivaled excellence

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Main Highlights

A NECESSARY COMPONENT OF HEMOGLOBIN Iron is a necessary component of hemoglobin; the oxygen carrier responsible for delivering oxygen to the cells; including muscle cells (1); Natures Bounty Iron helps promote normal red blood cell production (1)
HELPS MAINTAIN ENERGY UTILIZATION (1) Iron supports energy utilization; helping you to feel your best (1)
SUPPORTS WOMENS HEALTH (1) Everyone needs Iron; but pregnancy and menstruation may increase Iron requirements; Often recommended as a mineral supplement for women; Natures Bounty Iron offers the daily nutritional support you need (1)
NECESSARY FOR OVERALL HEALTH Taking a daily Iron supplement with Ferrus Sulfate helps provide your body with the iron it needs for daily functioning (1)
FROM THE TRUSTED WELLNESS EXPERTS Natures Bounty Iron is a product of 50 years of dedication to quality; consistency and scientific research to make vitamins and nutritional supplements of unrivaled excellence

8.3

Very Good

P Puregen Labs

Puregen Labs Ferrous Sulfate 325 mg (65 mg Elemental Iron) High Potency Iron Supplement | No Artificial Color Additives - 200 Tablets

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Main Highlights

ACTIVE INGREDIENT: This Puregen Ferrous Sulfate supplement is an Iron deficiency supplement that is vital for red blood cell formation and supports healthy cognitive function.
ESSENTIAL MINERAL: Our Ferrous Sulfate 325 mg tablets deliver 65 mg of elemental iron per serving which is equivalent to 211% of your recommended dietary intake.
POWERFULL FORMULA: High Potency Formula to reduce fatigue, boosts hemoglobin and supports red blood production.
NATURALLY FREE OF: Gluten, Wheat, Yeast, Milk, Lactose, Artificial Flavor & Sweetener & NON-GMO & No synthetic dyes & No Artificial Colors.
DISCLAIMER: Our product contains No synthetic dyes & No Artificial Colors, therefore the tablets are naturally gray in color. The tablet color is naturally occurring so the shade of gray may vary from tablet to tablet.
QUALITY YOU CAN TRUST : This product is made and quality tested in the United States with globally sourced ingredients. Our product is made in a facility following strict GMP guidelines to ensure safety and quality.

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Main Highlights

ACTIVE INGREDIENT: This Puregen Ferrous Sulfate supplement is an Iron deficiency supplement that is vital for red blood cell formation and supports healthy cognitive function.
ESSENTIAL MINERAL: Our Ferrous Sulfate 325 mg tablets deliver 65 mg of elemental iron per serving which is equivalent to 211% of your recommended dietary intake.
POWERFULL FORMULA: High Potency Formula to reduce fatigue, boosts hemoglobin and supports red blood production.
NATURALLY FREE OF: Gluten, Wheat, Yeast, Milk, Lactose, Artificial Flavor & Sweetener & NON-GMO & No synthetic dyes & No Artificial Colors.
DISCLAIMER: Our product contains No synthetic dyes & No Artificial Colors, therefore the tablets are naturally gray in color. The tablet color is naturally occurring so the shade of gray may vary from tablet to tablet.
QUALITY YOU CAN TRUST : This product is made and quality tested in the United States with globally sourced ingredients. Our product is made in a facility following strict GMP guidelines to ensure safety and quality.

8.1

Very Good

LifeSeasons

LifeSeasons Blood Nourish-R - Iron Deficiency Supplement - Supports Anemia, Fatigue & Dizziness - No Constipation - Blood Building - Iron, Beet Root, Alfalfa, Raspberry & Vitamin B-12-60 Capsules

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Main Highlights

Health Benefits - Nourish a healthy blood-building process with LifeSeasons' Blood Nourish-R Blood Building Support supplement. Our curated formula relies on natural and non-constipating ingredients to help revitalize and energize to support a healthy blood-building process.
Clinically Tested Ingredients - Thoughtfully curated from natural ingredients like Iron, Alfalfa, Vitamin B12, and Beetroot, our formula is designed to help nourish healthy blood-building processes. Take this tired blood supplement to help nourish blood building and support your overall health.
Effective - Most people will see initial effects from Blood Nourish-R within one hour, which includes a feeling of more energy and general revitalization. Many people see even greater results when taking this product over a longer period of time, specifically for one to two months.
Targeted Support - This natural blood-building support supplement is designed to help rebuild blood throughout the body. This supplement provides nutrients and herbs needed to help build healthy blood.
One Unique Blend - Achieving a change in health requires the right ingredients in the right doses. This used to require purchasing many individual vitamins and nutrients to create an effective blend. LifeSeasons was doctor formulated to put that blend into one bottle.

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Main Highlights

Health Benefits - Nourish a healthy blood-building process with LifeSeasons' Blood Nourish-R Blood Building Support supplement. Our curated formula relies on natural and non-constipating ingredients to help revitalize and energize to support a healthy blood-building process.
Clinically Tested Ingredients - Thoughtfully curated from natural ingredients like Iron, Alfalfa, Vitamin B12, and Beetroot, our formula is designed to help nourish healthy blood-building processes. Take this tired blood supplement to help nourish blood building and support your overall health.
Effective - Most people will see initial effects from Blood Nourish-R within one hour, which includes a feeling of more energy and general revitalization. Many people see even greater results when taking this product over a longer period of time, specifically for one to two months.
Targeted Support - This natural blood-building support supplement is designed to help rebuild blood throughout the body. This supplement provides nutrients and herbs needed to help build healthy blood.
One Unique Blend - Achieving a change in health requires the right ingredients in the right doses. This used to require purchasing many individual vitamins and nutrients to create an effective blend. LifeSeasons was doctor formulated to put that blend into one bottle.

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