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Iron 40 mg

4.8
★ ★ ★ ★ ★
(4782 ratings)
Iron 40 mg
Product Image
Score87

Chelated iron and favorable value support a strong rating for confirmed iron needs. The high amount, two-tablet serving, and missing cofactors limit casual use.

How scoring works
Tablet
Quantity:90 Tablet(s) • (45 servings)
Goals:
Hair Health
Energy
Immunity
Productivity Boost
Mental Focus

Score 87

Chelated iron and favorable value support a strong rating for confirmed iron needs. The high amount, two-tablet serving, and missing cofactors limit casual use.

How scoring works

Also available as

1 option
180 servings Iron 40 mg • 180 Tablet(s) • 90 servings $10.84 ($0.12 per serving)
$8.46($0.18 per serving)
iHerb
$ 8.46
iHerb
$ 8.46
Pure Formulas
$ 8.46
Report prices

Analysis

The full serving supplies 40 mg of iron as a soy amino acid chelate. Chelation is a form-quality advantage over basic salts, although two compressed tablets may be less comfortable than a gentle capsule or liquid.

This amount can support oxygen transport, energy, focus, or hair when low iron is the actual limiting factor. It is not a general energy or cognitive enhancer for people whose iron stores are adequate.

No vitamin C, folate, or vitamin B12 accompanies the iron. Strong value makes the product efficient for a defined repletion plan, but the dose is close to the adult daily upper limit.

Who is it for
  • Adults with a confirmed need for substantial iron
  • People who prefer an amino acid chelate and can take two tablets
Best for
  • Directed iron repletion
  • Deficiency-related fatigue or shedding when low iron has been identified

Pros

  • Uses a soy amino acid chelate
  • Substantial and clearly disclosed iron amount
  • Focused single-active formula
  • Favorable serving value

Cons

  • Full serving requires two tablets
  • No vitamin C or blood-forming cofactors
  • Amount is close to the adult daily upper limit
  • Contains a soy-derived chelate

Warnings

  • 40 mg of iron can cause nausea, constipation, or stomach pain, particularly when taken without food.
  • Iron should match a confirmed need because unnecessary use can lead to excess accumulation.
  • Keep the product securely away from children because accidental iron overdose can be dangerous.
  • Iron can reduce absorption of levothyroxine and tetracycline or quinolone antibiotics, so dose spacing should follow the medicine instructions.

Nutrient quality

80 Highest impact

Amino acid chelated iron supplies a potent and focused iron serving. The amount is better suited to a defined iron need than casual use.

Ingredient transparency

87 Highest impact

Active nutrient amounts are stated individually without a hidden blend. Complete daily directions and non-active ingredients are not included in the supplied facts.

Customer satisfaction

90 Highest impact

The aggregate rating is favorable and is supported by substantial review volume. No specific comments are supplied, so repeated complaints and purpose alignment cannot be confirmed directly.

Value for money

93 Highest impact

Value is favorable for the nutrient forms and effective serving. The formula avoids low-value active padding.

Report analysis

Goals

Hair Health
Hair Health
Impact
Highest effect
A- Goal FitA- Strength of SupportC- CoverageA+ Formula Quality
Iron · 40 mg

Chelated iron can reduce shedding when low iron status is the underlying cause, and the 40 mg amount is suited to correction rather than casual beauty use. The amino-acid chelate is a useful form, though no absorption cofactor is included.

The formula does not provide keratin, silicon, or follicle-targeted botanicals, so its value depends on a documented iron need. The 40 mg iron serving can cause nausea, constipation, or abdominal pain and should be kept away from children because iron overdose is dangerous.

Study evidence
Iron Disputed 25 studies
Energy
Energy
Impact
Highest effect
A- Goal FitA- Strength of SupportC- CoverageA+ Formula Quality
Iron · 40 mg

Chelated iron provides a substantial amount for oxygen transport and may improve energy when iron status is low. The amino acid chelate is preferable to basic iron salts.

The two-tablet serving lacks vitamin C or other absorption cofactors and may be less gentle than some capsule or liquid options. Iron at this level is best guided by confirmed need because unnecessary iron can cause side effects and excess accumulation.

Study evidence
Iron Supportive 74 studies
Immunity
Immunity
Impact
Highest effect
B+ Goal FitA- Strength of SupportD+ CoverageA Formula Quality

Amino acid chelated iron supplies a meaningful amount for people with a confirmed iron need. The chelated form is preferable to basic iron salts.

Iron is not a general-purpose supplement when status is adequate, so the formula is best used for a defined need. The stated amount can cause digestive effects and may be harmful when iron stores are already sufficient.

Study evidence
Iron Supportive 23 studies
Productivity Boost
Productivity Boost
Impact
High effect
C+ Goal FitB+ Strength of SupportD+ CoverageA+ Formula Quality
Iron · 40 mg

A high iron amount may reduce fatigue and brain fog when low iron is the cause. It is unlikely to improve productivity in someone whose iron status is already adequate.

The soy amino acid chelate is a favorable form, though the full serving requires two tablets and lacks vitamin C. The 40 mg amount may cause constipation, nausea, or stomach pain and is better suited to a defined iron need than casual use.

Study evidence
Iron Supportive 69 studies
Mental Focus
Mental Focus
Impact
High effect
D Goal FitB+ Strength of SupportD- CoverageA Formula Quality

Chelated iron may help concentration when low iron is impairing oxygen transport or neurotransmitter production. The 40 mg amount is substantial and clearly disclosed.

People with adequate iron should not expect a direct nootropic effect from routine supplementation. The high amount approaches the adult daily upper limit and can cause constipation, nausea, or harmful accumulation when used without a defined need.

Study evidence
Iron Adverse 33 studies

Ingredients

IngredientAmount per serving
Iron (Soy Amino Acid Chelate)
 40 mg
Gluten Free Adults 18–50 Vegetarian
Report overview
Iron (Soy Amino Acid Chelate) · 40 mg OverallScore82
B- Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyB+ Value

The amino acid chelate offers a higher-quality iron form than basic salts, and the amount fits common iron-support needs. Two compressed tablets are less convenient and may be harsher than a capsule, while the formula lacks absorption cofactors. The low serving cost provides good value despite the less favorable delivery format.

View ingredientView products
Loading alternative details
88 Performance

Gentle Iron 28 mg

Nature's Bounty
<p>Ferrous bisglycinate is paired with 60 mg vitamin C, folate, and vitamin B12, giving the iron component a coherent absorption and blood-building support profile. The 28 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
89 Performance

Chelated Iron 27 mg

Carlson
<p>A clearly dosed 27 mg iron bisglycinate capsule offers a well-absorbed and generally gentle form without unrelated active ingredients. The 27 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
85 Performance

Iron Complex

Advanced Nutrition by Zahler
<p>Ferrochel iron, vitamin C, methylcobalamin, folate, and histidine create a focused formula with useful complementary nutrients. The 25 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
89 Budget

Iron 18 mg

NOW
<p>Ferrochel iron bisglycinate supplies a clearly labeled 18 mg amount in a generally gentle form at much lower recurring cost. The 18 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
86 Budget

Albion Chelated Ferrochel Iron 18 mg

Swanson Ultra
<p>TRAACS Ferrochel provides a well-defined 18 mg chelated iron amount with strong recurring value. The 18 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
85 Budget

Iron 25 mg

Source Naturals
<p>A 25 mg amino acid chelate provides economical iron support, although the exact chelate is not identified and no absorption cofactors are included. The 25 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
86 Value

Chelated Iron 18 mg

Bluebonnet
<p>An 18 mg ferrous bisglycinate capsule combines a moderate adult amount, a well-absorbed form, and good recurring value. The 18 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
88 Value

Chelated Iron

Solgar
<p>A clearly labeled 25 mg iron bisglycinate serving provides strong form quality at favorable recurring value. The 25 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
86 Value

High Absorption Iron with Ferrochel 27 mg

Doctor's Best
<p>Ferrochel supplies a transparent 27 mg chelated iron amount in a simple, economical capsule. The 27 mg amount is lower than the original 40 mg serving and may reduce digestive burden, though iron should still be reserved for a confirmed need because excess can accumulate.</p>
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Clinical evaluation of iron treatment efficiency among non-anemic but iron-deficient female blood donors: a randomized controlled trial.
    Waldvogel S; Pedrazzini B; Vaucher P; Bize R; Cornuz J; Tissot JD; Favrat B · BMC medicine · 2012
    Randomized trial154 participantsEnergy forIron
  2. Iron plays a certain role in patterned hair loss.
    Park SY; Na SY; Kim JH; Cho S; Lee JH · Journal of Korean medical science · 2014
    Case-control study420 participantsHair Health forIron
  3. Effects of iron supplementation in nonanemic pregnant women, infants, and young children on the mental performance and psychomotor development of children: a systematic review of randomized controlled trials.
    Szajewska H; Ruszczynski M; Chmielewska A · The American journal of clinical nutrition · 2010
    Systematic review561 participants5 studies pooledMental Focus forIron
  4. Intravenous iron versus blood transfusion for postpartum anemia: a systematic review and meta-analysis.
    Caljé E; Groom KM; Dixon L; Marriott J; Foon R; Oyston C; Bloomfield FH; Jordan V · Systematic reviews · 2024
    Meta-analysis4,196 participantsEnergy forIron
  5. Scientific Opinion on the substantiation of a health claim related to iron and maintenance of normal hair growth pursuant to Article 13(5) of Regulation (EC) No 1924/2006.
    EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) · EFSA journal. European Food Safety Authority · 2026
    Guideline / consensusHair Health forIron
  6. The effects of oral iron supplementation on cognition in older children and adults: a systematic review and meta-analysis.
    Falkingham M; Abdelhamid A; Curtis P; Fairweather-Tait S; Dye L; Hooper L · Nutrition journal · 2010
    Meta-analysisMental Focus forIron
  7. Iron deficiency, general health and fatigue: results from the Australian Longitudinal Study on Women's Health.
    Patterson AJ; Brown WJ; Powers JR; Roberts DC · Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2001
    Cohort studyEnergy forIron
  8. Brain iron concentrations in the pathophysiology of children with attention deficit/hyperactivity disorder: a systematic review.
    Degremont A; Jain R; Philippou E; Latunde-Dada GO · Nutrition reviews · 2021
    Systematic review18 studies pooledMental Focus forIron
  9. A Hospital-based Study to Determine Causes of Diffuse Hair Loss in Women.
    Malkud S · Journal of clinical and diagnostic research : JCDR · 2015
    Observational study180 participantsHair Health forIron
  10. Large-dose intravenous ferric carboxymaltose injection for iron deficiency anemia in heavy uterine bleeding: a randomized, controlled trial.
    Van Wyck DB; Mangione A; Morrison J; Hadley PE; Jehle JA; Goodnough LT · Transfusion · 2010
    Randomized trial477 participantsEnergy forIron
  11. Iron status in diffuse telogen hair loss among women.
    Moeinvaziri M; Mansoori P; Holakooee K; Safaee Naraghi Z; Abbasi A · Acta dermatovenerologica Croatica : ADC · 2010
    Case-control study60 participantsHair Health forIron
  12. Cognitive Performance in Indian School-Going Adolescents Is Positively Affected by Consumption of Iron-Biofortified Pearl Millet: A 6-Month Randomized Controlled Efficacy Trial.
    Scott SP; Murray-Kolb LE; Wenger MJ; Udipi SA; Ghugre PS; Boy E; Haas JD · The Journal of nutrition · 2019
    Randomized trial140 participantsMental Focus forIron
  13. The Effect of Parenteral or Oral Iron Supplementation on Fatigue, Sleep, Quality of Life and Restless Legs Syndrome in Iron-Deficient Blood Donors: A Secondary Analysis of the IronWoMan RCT.
    Macher S; Herster C; Holter M; Moritz M; Matzhold EM; Stojakovic T; Pieber TR; Schlenke P; Drexler C; Amrein K · Nutrients · 2021
    Randomized trial176 participantsEnergy forIron
  14. Effects of iron supplementation twice a week on attention score and haematologic measures in female high school students.
    Rezaeian A; Ghayour-Mobarhan M; Mazloum SR; Yavari M; Jafari SA · Singapore medical journal · 2015
    Randomized trial200 participantsMental Focus forIron
  15. Low iron stores: a risk factor for excessive hair loss in non-menopausal women.
    Deloche C; Bastien P; Chadoutaud S; Galan P; Bertrais S; Hercberg S; de Lacharrière O · European journal of dermatology : EJD · 2008
    Cross-sectional study5,110 participantsHair Health forIron
  16. Maternal Fatigue after Postpartum Anemia Treatment with Intravenous Ferric Carboxymaltose vs. Intravenous Ferric Derisomaltose vs. Oral Ferrous Sulphate: A Randomized Controlled Trial.
    Bombač Tavčar L; Hrobat H; Gornik L; Preložnik Zupan I; Vidmar Šimic M; Pečlin P; Kavšek G; Lučovnik M · Journal of clinical medicine · 2024
    Randomized trial300 participantsEnergy forIron
  17. Prenatal iron supplementation adjusted to maternal iron stores reduces behavioural problems in 4-year-old children.
    Iglesias-Vázquez L; Canals J; Hernández-Martínez C; Voltas N; Arija V · Maternal & child nutrition · 2023
    Randomized trial230 participantsMental Focus forIron
  18. Retrospective Review of 2851 Female Patients With Telogen Effluvium: A Single-Center Experience.
    Karakoyun Ö; Ayhan E; Yıldız İ · Journal of cosmetic dermatology · 2025
    Cohort study2,851 participantsHair Health forIron
  19. Ferric carboxymaltose vs. oral iron in the treatment of pregnant women with iron deficiency anemia: an international, open-label, randomized controlled trial (FER-ASAP).
    Breymann C; Milman N; Mezzacasa A; Bernard R; Dudenhausen J; FER-ASAP investigators · Journal of perinatal medicine · 2018
    Randomized trial252 participantsEnergy forIron
  20. Iron Status, Anemia, and Iron Interventions and Their Associations with Cognitive and Academic Performance in Adolescents: A Systematic Review.
    Samson KLI; Fischer JAJ; Roche ML · Nutrients · 2022
    Systematic review50 studies pooledMental Focus forIron
  21. Hair Loss After Metabolic and Bariatric Surgery: a Systematic Review and Meta-analysis.
    Zhang W; Fan M; Wang C; Mahawar K; Parmar C; Chen W; Yang W; Global Bariatric Research Collaborative · Obesity surgery · 2021
    Meta-analysis2,538 participants18 studies pooledHair Health forIron
  22. Hypophosphatemia attenuates improvements in vitality after intravenous iron treatment in patients with inflammatory bowel disease.
    Bjorner JB; Kennedy N; Lindgren S; Pollock RF · Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2024
    Randomized trial97 participantsEnergy forIron
  23. Effect of iron supplementation on cognition in Greek preschoolers.
    Metallinos-Katsaras E; Valassi-Adam E; Dewey KG; Lönnerdal B; Stamoulakatou A; Pollitt E · European journal of clinical nutrition · 2005
    Randomized trial49 participantsMental Focus forIron
  24. The Association Between Alopecia Areata and Iron Deficiency Anemia: A Large-Scale Population-Based Case-Control Study.
    Davidovici B; Drutin Y; Ben-Tov A; Mimouni D; Wohl Y · Journal of personalized medicine · 2026
    Case-control study100,203 participantsHair Health forIron
  25. Intravenous iron for the treatment of fatigue in nonanemic, premenopausal women with low serum ferritin concentration.
    Krayenbuehl PA; Battegay E; Breymann C; Furrer J; Schulthess G · Blood · 2011
    Randomized trial90 participantsEnergy forIron
  26. Associations between moderate alcohol consumption, brain iron, and cognition in UK Biobank participants: Observational and mendelian randomization analyses.
    Topiwala A; Wang C; Ebmeier KP; Burgess S; Bell S; Levey DF; Zhou H; McCracken C; Roca-Fernández A; Petersen SE; Raman B; Husain M; Gelernter J; Miller KL; Smith SM; Nichols TE · PLoS medicine · 2022
    Cohort study20,729 participantsMental Focus forIron
  27. Comparative Analysis of Postoperative Hair Loss and Micronutrient Deficiencies After One-Anastomosis Gastric Bypass Versus Sleeve Gastrectomy.
    Chinisaz F; Maleki T; Najjari K; Miratashi Yazdi SA · Obesity surgery · 2026
    Cohort study261 participantsHair Health forIron
  28. Effect of iron therapy on fatigue symptoms in non-anaemic iron deficient women of reproductive age- A Randomized Controlled Trial.
    Sultana N; Bajwa FA; Sikandar MZ; Haider MM; Majeed T · JPMA. The Journal of the Pakistan Medical Association · 2026
    Randomized trial164 participantsEnergy forIron
  29. Longitudinal Development of Brain Iron Is Linked to Cognition in Youth.
    Larsen B; Bourque J; Moore TM; Adebimpe A; Calkins ME; Elliott MA; Gur RC; Gur RE; Moberg PJ; Roalf DR; Ruparel K; Turetsky BI; Vandekar SN; Wolf DH; Shinohara RT; Satterthwaite TD · The Journal of neuroscience : the official journal of the Society for Neuroscience · 2020
    Cohort studyMental Focus forIron
  30. Alopecia Areata Different View; Heavy Metals.
    Ozaydin-Yavuz G; Yavuz IH; Demir H; Demir C; Bilgili SG · Indian journal of dermatology · 2024
    Case-control study61 participantsHair Health forIron
  31. Intravenous iron isomaltoside treatment of women suffering from severe fatigue after postpartum hemorrhage.
    Holm C; Thomsen LL; Langhoff-Roos J · The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians · 2019
    Randomized trial85 participantsEnergy forIron
  32. Iron Deficiency and Nonscarring Alopecia in Women: Systematic Review and Meta-Analysis.
    Treister-Goltzman Y; Yarza S; Peleg R · Skin appendage disorders · 2022
    Meta-analysis10,029 participants36 studies pooledHair Health forIron
  33. Assessment of Serum Ferritin Levels in Female Patients With Telogen Effluvium.
    Thamotharan N; Harikumar MV; Sundaram M; Swaminathan A; Rangarajan S · Cureus · 2026
    Cross-sectional study100 participantsHair Health forIron
  34. Diagnosis and treatment of female alopecia: Focusing on the iron deficiency-related alopecia.
    Lin CS; Chan LY; Wang JH; Chang CH · Tzu chi medical journal · 2023
    Cohort study155 participantsHair Health forIron
  35. The immune response in iron-deficient children: Impaired cellular defense mechanisms with altered humoral components.
    Macdougall LG; Anderson R; McNab GM; Katz J · The Journal of pediatrics · 1975
    Single-arm trial27 participantsImmunity forIron
  36. The role of iron homeostasis in remodeling immune function and regulating inflammatory disease.
    Mu Q; Chen L; Gao X; Shen S; Sheng W; Min J; Wang F · Science bulletin · 2023
    Narrative reviewImmunity forIron
  37. Hepcidin--a peptide hormone at the interface of innate immunity and iron metabolism.
    Ganz T · Current topics in microbiology and immunology · 2006
    Narrative reviewImmunity forIron
  38. Adaptive immunity and vaccination - iron in the spotlight.
    Preston AE; Drakesmith H; Frost JN · Immunotherapy advances · 2025
    Narrative reviewImmunity forIron
  39. Buried Treasure: Evolutionary Perspectives on Microbial Iron Piracy.
    Barber MF; Elde NC · Trends in genetics : TIG · 2016
    Narrative reviewImmunity forIron
  40. The Effect of Iron-Fortified Lentils on Blood and Cognitive Status among Adolescent Girls in Bangladesh.
    Barnett AL; Wenger MJ; Yunus FM; Jalal C; DellaValle DM · Nutrients · 2023
    Randomized trial359 participantsMental Focus Productivity Boost forIron
  41. Randomised study of cognitive effects of iron supplementation in non-anaemic iron-deficient adolescent girls.
    Bruner AB; Joffe A; Duggan AK; Casella JF; Brandt J · Lancet (London, England) · 1996
    Randomized trial81 participantsMental Focus forIron
  42. Effects of daily iron supplementation in primary-school-aged children: systematic review and meta-analysis of randomized controlled trials.
    Low M; Farrell A; Biggs BA; Pasricha SR · CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2014
    Meta-analysis7,089 participants32 studies pooledProductivity Boost forIron
  43. Consumption of Iron-Biofortified Beans Positively Affects Cognitive Performance in 18- to 27-Year-Old Rwandan Female College Students in an 18-Week Randomized Controlled Efficacy Trial.
    Murray-Kolb LE; Wenger MJ; Scott SP; Rhoten SE; Lung'aho MG; Haas JD · The Journal of nutrition · 2017
    Randomized trial150 participantsProductivity Boost forIron
  44. Functional consequences of iron supplementation in iron-deficient female cotton mill workers in Beijing, China.
    Li R; Chen X; Yan H; Deurenberg P; Garby L; Hautvast JG · The American journal of clinical nutrition · 1994
    Randomized trial80 participantsProductivity Boost forIron
  45. Daily iron supplementation for improving anaemia, iron status and health in menstruating women.
    Low MS; Speedy J; Styles CE; De-Regil LM; Pasricha SR · The Cochrane database of systematic reviews · 2016
    Meta-analysis8,506 participants67 studies pooledProductivity Boost forIron