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Earth Source Food Fermented Koji Iron 27 mg

4.7
★ ★ ★ ★ ★
(478 ratings)
Iron 27 mg
Product Image
Score83
A clearly dosed fermented sulfate capsule for short-term use, but value and likely tolerance trail strong chelated alternatives.
How scoring works
Capsule
Quantity:30 Capsule(s) • (30 servings)
Goals:
Hair Health
Energy
Productivity Boost

Score 83

A clearly dosed fermented sulfate capsule for short-term use, but value and likely tolerance trail strong chelated alternatives.
How scoring works
$9.74($0.32 per serving)
iHerb
$ 9.74
Pure Formulas
$ 10.34
Amazon
$ 13.69
Daily Vita
$ 10.34
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Analysis

Koji-fermented iron sulfate provides 27 mg of iron in a focused capsule. The fermentation process distinguishes the form, though the supplied data do not show a clear absorption or tolerance advantage.

The iron amount is meaningful for deficiency-focused use and may support iron-related energy or hair needs when low status is present. A sulfate-based form can still cause digestive effects despite the fermented positioning.

The 30-capsule supply is convenient for a short trial but is less competitive on serving value. Response and tolerance should drive the decision to continue rather than the fermentation claim alone.

Who is it for
  • Adults with confirmed low iron
  • People interested in a fermented iron format
Best for
  • A short monitored iron trial
  • Users preferring koji-fermented ingredients

Pros

  • 27 mg clearly disclosed iron
  • Focused single-active formula
  • Distinctive koji-fermented process
  • Short trial-size supply

Cons

  • Sulfate may cause digestive effects
  • No demonstrated form advantage is supplied
  • Less competitive value
  • No vitamin C or cofactors

Warnings

  • Use iron only for a confirmed need because excess can accumulate in iron-overload disorders.
  • The sulfate form may cause constipation, nausea, stomach irritation, or dark stools.

Nutrient quality

93 Highest impact

A useful iron amount supports focused supplementation. Limited independent form detail and missing cofactors prevent a stronger quality conclusion.

Ingredient transparency

85 Highest impact

The active source and amount are stated without a proprietary blend. Missing full directions, non-active ingredients, and deeper raw-material specifications leave gaps.

Customer satisfaction

70 High impact

The supplied average is strong and supported by moderate response volume. No comment-level evidence is available to assess repeated complaints or alignment with the intended use.

Value for money

79 High impact

A useful dose and specialized source provide moderate practical value. Limited form evidence and missing cofactors keep value below leading chelates.

Report analysis

Goals

Hair Health
Impact
Highest effect
A- Goal FitA Strength of SupportD CoverageA Formula Quality
Iron · 27 mg

Iron directly addresses low ferritin, a major nutrition-related cause of diffuse hair shedding. Evidence strongly supports correcting iron deficiency, while extra iron is unlikely to improve hair when status is adequate.

The 27 mg amount is substantial enough for deficiency-oriented support. The single-ingredient design is coherent, but 27 mg of iron can cause digestive effects and should be reserved for a demonstrated or likely need.

Study evidence
Iron Disputed 25 studies
Energy
Impact
High effect
B+ Goal FitB+ Strength of SupportD- CoverageA Formula Quality
Iron · 27 mg

Food-fermented iron provides a targeted foundational nutrient in a potentially gentler form than a standard sulfate tablet. The disclosed amount is meaningful when increased iron need or deficiency has been established.

Vitamin C, folate, and vitamin B12 are not included, so those supporting nutrients must come from the diet or another product. Iron should not be taken casually when stores are adequate because excess can cause digestive symptoms and harmful accumulation.

Study evidence
Iron Supportive 74 studies
Productivity Boost
Impact
High effect
C Goal FitA- Strength of SupportD- CoverageA Formula Quality
Iron · 27 mg

Iron may restore concentration and stamina when iron deficiency is present, but it is not a direct nootropic for iron-replete users. Evidence strongly supports correcting iron-deficiency fatigue and cognitive symptoms, with little basis for extra benefit beyond adequate status.

The 27 mg amount is sufficient for deficiency-oriented support under appropriate guidance. A single-ingredient formula is logically focused, but 27 mg of iron can cause digestive effects and should not be used without a clear need.

Study evidence
Iron Supportive 69 studies

Ingredients

IngredientAmount per serving
Iron (Koji fermented Iron Sulfate)
27 mg
Gluten Free Adults 18–50 Vegan Kosher Dairy Free Halal Vegetarian
Report overview
B Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyD+ Value

Food-fermented Koji iron provides a high-quality form at an effective 27 mg dose. The capsule is convenient and likely gentler than a standard sulfate tablet, but no vitamin C, folate, or vitamin B12 is included. The serving cost is modestly above the median, making value fair rather than exceptional.

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Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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 participantsProductivity Boost forIron
  22. 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