12 best thorne research iron supplements

• Non-Constipating: A non-constipating, well-absorbed form of iron
• Blood Building: An essential mineral for red blood cell formation*
• Fatigue: Helps fight fatigue and other symptom of iron deficiency*
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.
• Thorne's commitment to integrity and science-backed products has helped us earn the trust of thousands of health-care professionals, U.S. National Teams, the Mayo Clinic, and families around the world.

User questions & answers

Product features

Thorne Bestseller

Thorne has been trusted by health-care practitioners, U.S. National Teams, and families around the world for more than 30 years. Thorne Bestsellers are a testament to Thorne's mission to provide high-quality supplements that are tested for quality, safety, and efficacy.

Convenient Protocol

One capsule per day use for convenience and ease.

Greater Absorption

25 mg of elemental iron per capsule reacted with glycine for optimal absorption.*

Designed for Sensitivities

Iron Bisglycinate uses iron in a form that enhances its absorption without gastrointestinal side effects.*

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

• Red Blood Cells: A complete blood-building formula*
• Non-Constipating Iron: A well-absorbed, non-constipating form of iron -- iron bisglycinate -- from Albion Laboratories
• Optimal Forms: active, tissue ready, well-absorbed nutrients -- folate, vitamin B12, and iron
• Vitamin C: to enhance the absorption of iron
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.

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Unique Formula

Ferrasorb provides 36 mg of elemental iron per capsule, plus the active forms of folate and vitamins B6 and B12, which are essential for blood-building. Vitamin C optimizes iron absorption.

Well-Researched Benefits

Iron deficiency can manifest as weakness, fatigue, shortness of breath on exertion, dizziness, tinnitus, spots before the eyes, drowsiness, irritability, infrequent menses, and loss of libido.

Purest Ingredients

There are no unnecessary fillers or additives in Thorne supplements. Thorne is committed to providing high-quality supplements that contain research-backed ingredients, in efficacious amounts, that retain the potency to meet label claims until the day of expiration.

Thorne Bestseller

Thorne has been trusted by health-care practitioners, U.S. National Teams, and families around the world for more than 30 years. Thorne Bestsellers are a testament to Thorne's mission to provide high-quality supplements that are tested for quality, safety, and efficacy.

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

• Comprehensive Multi Mineral Formula: For individuals at high risk for mineral deficiencies, including the elderly
• Research-Based: Contains well-researched forms of minerals
• Calcium/Magnesium: Highly absorbable dimagnesium malate and dicalcium malate
• Non-Constipating Iron: Ferrochel – exceptionally well tolerated form of iron
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.

User questions & answers

Product features

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

• Well-researched forms of minerals
• Highly absorbable dimagnesium malate and dicalcium malate*
• Trace minerals as glycinate chelates from Albion Laboratories for optimal absorption*
• Thorne products contain ingredients from the purest sources worldwide. Flavors, colors, preservatives, and sweeteners derived from natural sources.
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.

User questions & answers

Product features

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

• Prenatal Multi: Designed for women who are trying to conceive, pregnant, or lactating
• Gentle: Formulated to be gentle and effective and to reduce nausea
• Comprehensive: Contains the key nutrients that support a healthy pregnancy, including vitamins A, B12, and folate, and the minerals magnesium, iron, and iodine
• No Additives: Contains none of the additives typically contained in mainstream prenatal supplements
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.

User questions & answers

Product features

Designed for Sensitivities

Basic Prenatal is easier on the stomach because it uses well-absorbed iron bisglycinate to lessen iron’s constipating effect.*

Free of Additives

Basic Prenatal contains the purest possible ingredients. There are no additives or coatings often found in mainstream prenatal supplements.

Thorne Bestseller

Thorne has been trusted by health-care practitioners, U.S. National Teams, and families around the world for more than 30 years. Thorne Bestsellers are a testament to Thorne's mission to provide high-quality supplements that are tested for quality, safety, and efficacy.

Greater Absorption

Basic Prenatal uses ingredients in their most tissue-ready and absorbable forms for optimal utilization.*

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

• Easy-To-Use Multi: Easy-to-use daily multi-vitamin/mineral supplement for everybody
• Optimal Absorption: Comprehensive multi formula designed for optimal absorption
• Effective Ingredients: Provides 2,000 IU of vitamin D3 in a 2-capsule serving, in addition to vitamin K1, vitamin K2, and active methyl-folate
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.
• Thorne's commitment to integrity and science-backed products has helped us earn the trust of thousands of health-care professionals, U.S. National Teams, the Mayo Clinic, and families around the world.

User questions & answers

Product features

Thorne Bestseller

Thorne has been trusted by health-care practitioners, U.S. National Teams, and families around the world for more than 30 years. Thorne Bestsellers are a testament to Thorne's mission to provide high-quality supplements that are tested for quality, safety, and efficacy.

Unique Formula

Basic Nutrients 2/Day contains 2000 IU of vitamin D3 and 400 mcg of vitamin K per serving.

Convenient Protocol

Basic Nutrients calls for an easy 2 capsules per day protocol.

Greater Absorption

Basic Nutrients 2/Day uses bioactive B vitamins and amino acid-chelated minerals designed for optimal absorption.

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

• New Additions: Now contains nicotinamide riboside (niagen), resveratrol, quercetin phytosome, bilberry, and more vitamin D, calcium, and magnesium.
• Antioxidant Multi: A multi-vitamin/mineral supplement for individuals who need extra antioxidants
• Designed For: Specially formulated for athletes, the elderly, and those exposed to a toxic environment*
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.
• Thorne's commitment to integrity and science-backed products has helped us earn the trust of thousands of health-care professionals, U.S. National Teams, the Mayo Clinic, and families around the world.

User questions & answers

Product features

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

Product description

We are reimagining our multi portfolio to make it easier for individuals to understand which supplements to take – and why. It’s why we are splitting our Basic Nutrients III into Men’s Multi 50 plus and Women’s Multi 50 plus. Although the formulas will initially remain the same in both products, splitting Basic Nutrients III will allows us to personalize each formula for men and women as new research and ingredients are verified. Ultimately, our Men’s Multi 50 plus and Women’s Multi 50 plus will allow Thorne to better meet the unique nutritional needs of men and women so they can stay active and healthy through their 50s and beyond. Since 1984, Thorne has set the standard for the exceptional formulation and quality manufacturing of nutritional supplements. Thorne delivers premium, science-based products, a health diagnostics technology platform, and the latest in medical education. With more than 350 products, Thorne is the most dispensed brand by 30-40 year old health-care practitioners. Thorne is dedicated to improving the health of our community as well as increasing the knowledge of nutritional health and wellness. Since 2012, Thorne has partnered with educational institutes and local charities to donate more than 1 million dollars in products and profits.

• Designed with nutrients the body can easily absorb and formulated for individuals at low risk for iron deficiency, including men and post-menopausal women*
• Includes optimal amounts of two key minerals – calcium and magnesium – in highly absorbable chelate form
• Vitamin A promotes eye health, healthy skin, and immune function*
• Vitamin D promotes strong bones and healthy immune function*
• Zinc bisglycinate, a highly absorbable form of zinc, benefits immune function and skin health*

User questions & answers

• Active Folate: A breakthrough in folate supplementation for healthy methylation*
• Pregnancy: Provides an excellent source of folate for pregnant women
• Many Functions: Promotes a positive mood and supports healthy blood vessel and nerve function*
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.
• Thorne's commitment to integrity and science-backed products has helped us earn the trust of thousands of health-care professionals, U.S. National Teams, the Mayo Clinic, and families around the world.

Product features

Greater Absorption

Thorne's 5-MTHF includes ingredients that are tissue-ready and in their most bioavailable form for better absorption.*

Clinically Studied

One study found a 600-percent greater blood level of 5-MTHF after supplementation with 5-MTHF compared to folic acid supplementation.* (Source: Willems F, Boers G, Blom H, et al. Pharmacokinetic study on the utilization of 5-methyltetrahydrofolate and folic acid. . . . Br J Pharmacol 2004;141:825-830.)

Well-Researched Benefits

In conjunction with vitamin B12, 5-MTHF functions as a methyl-group donor, facilitating the conversion of the amino acid homocysteine to methionine.* Methyl-group donation is vital to many biochemical conversion processes, including the synthesis of serotonin, melatonin, and DNA.*

Thorne Exclusive

Thorne only partners with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and absorbability.* 5-MTHF 1 mg Folate is a Thorne Exclusive because it contains ingredients exclusively sold to Thorne.

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

Product description

We are reimagining our multi portfolio to make it easier for individuals to understand which supplements to take – and why. It’s why we are splitting our Basic Nutrients III into Men’s Multi 50 plus and Women’s Multi 50 plus. Although the formulas will initially remain the same in both products, splitting Basic Nutrients III will allows us to personalize each formula for men and women as new research and ingredients are verified. Ultimately, our Men’s Multi 50 plus and Women’s Multi 50 plus will allow Thorne to better meet the unique nutritional needs of men and women so they can stay active and healthy through their 50s and beyond. Since 1984, Thorne has set the standard for the exceptional formulation and quality manufacturing of nutritional supplements. Thorne delivers premium, science-based products, a health diagnostics technology platform, and the latest in medical education. With more than 350 products, Thorne is the most dispensed brand by 30-40 year old health-care practitioners. Thorne is dedicated to improving the health of our community as well as increasing the knowledge of nutritional health and wellness. Since 2012, Thorne has partnered with educational institutes and local charities to donate more than 1 million dollars in products and profits.

• Designed with nutrients the body can easily absorb and formulated for individuals at low risk for iron deficiency, including men and post-menopausal women*
• Includes optimal amounts of two key minerals – calcium and magnesium – in highly absorbable chelate form
• Vitamin A promotes eye health, healthy skin, and immune function*
• Vitamin D promotes strong bones and healthy immune function*
• Zinc bisglycinate, a highly absorbable form of zinc, benefits immune function and skin health*

User questions & answers

• Optimally Absorbed: Well-absorbed form of an essential trace mineral
• Many Functions: Nutritional support for connective tissue, heart, skin, and nerve health*
• Balances Zinc: Supplement with zinc to prevent a deficiency of copper*
• Antioxidant: Essential component of the antioxidant superoxide dismutase
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.

User questions & answers

Product features

Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility - and ultimately better health.

Manufacturing the Right Way

We manufacture our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.

Product description

A synergistic blend of vitamin C and citrus bioflavonoids from oranges.



Since 1984, Thorne has set the standard for the exceptional formulation and quality manufacturing of nutritional supplements. Thorne delivers premium, science-based products, a health diagnostics technology platform, and the latest in medical education. With more than 350 products, Thorne is the most dispensed brand by 30-to 40-year-old health-care practitioners. Thorne is dedicated to improving the health of our community as well as increasing the knowledge of nutritional health and wellness. Since 2012, Thorne has partnered with educational institutes and local charities to donate more than $1M in products and profits.



Thorne products do not contain any unnecessary binders, coatings, disintegrants, fillers, or lubricants (including magnesium stearate) that could impair absorption. Thorne adheres to the FDA’s current Good Manufacturing Practices (cGMPs) and has the highest number of NSF Certified for Sport products which test for more than 200 banned substances for elite athletic competitions.

• Paired In Nature: Citrus bioflavonoids optimize the benefits of vitamin C*
• No Corn Starch: Not diluted with corn starch, as found in other vitamin C products on the market
• Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, dairy, yeast, shellfish, or fish.
• Thorne products contain ingredients from the purest sources worldwide. Flavors, colors, preservatives, and sweeteners are derived from natural sources. Our products never contain gluten, Genetically Modified Organisms (known as GMOs), artificial preservatives, stearates, wheat, rye, barley, eggs, or nuts. This product does not contain soy, dairy, corn, yeast, sugar, or magnesium stearate.
• Thorne's commitment to integrity and science-backed products has helped us earn the trust of thousands of health-care professionals, U.S. National Teams, the Mayo Clinic, and families around the world.

User questions & answers