These awards compare eligible nutritional-dose products with a confirmed comparison form and serving. Higher-dose and unresolved formulations remain in the full table; they may cost less. Testing review is pending, and one product can win multiple awards. See the dose guide for the regional eligibility limits.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Recognised certification
Manufacturer statement
Thorne product page states: "It is NSF Certified for Sport®, ensuring rigorous testing for quality and the absence of substances banned by major athletic organizations" and NSF’s own registry page for "Thorne® Iron Bisglycinate" confirms the product is certified, listing Brand: Thorne®, Product Type: Mineral, Package Size: 60, Serving Size: 1 capsule, and multiple lot numbers.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Recognised certification
Manufacturer statement
Thorne product page states: "It is NSF Certified for Sport®, ensuring rigorous testing for quality and the absence of substances banned by major athletic organizations" and NSF’s own registry page for "Thorne® Iron Bisglycinate" confirms the product is certified, listing Brand: Thorne®, Product Type: Mineral, Package Size: 60, Serving Size: 1 capsule, and multiple lot numbers.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Testing claimed
Manufacturer statement
Manufacturer site says: "We constantly source the best ingredients worldwide, test each individual product to ensure it meets our strict Quality Assurance Standards" and also "Laboratory Tested" / "Our products to the test, ensuring maximum potency from each formula we produce."
Compare elemental iron per daily serving, not compound weight. US adult RDAs are 8 mg for men and adults aged 51+, and 18 mg for women aged 19–50; pregnancy: 27 mg. These include food. The adult upper limit is 45 mg/day from all sources. Badge bands describe product strength, not a personal requirement or a treatment plan. Read the dose guide ↓
Thorne product page states: "It is NSF Certified for Sport®, ensuring rigorous testing for quality and the absence of substances banned by major athletic organizations" and NSF’s own registry page for "Thorne® Iron Bisglycinate" confirms the product is certified, listing Brand: Thorne®, Product Type: Mineral, Package Size: 60, Serving Size: 1 capsule, and multiple lot numbers.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
NOW Foods’ COA portal states generally that “Strength Testing” guarantees the product contains exactly what is on the label, and that NOW uses a science-based program to test raw materials and finished products for microbial and heavy metals contaminants. However, the specific COA page I could access was for Peppermint Oil (SKU 7495), not NOW Iron 18 mg, and I did not find an independently verifiable COA or certification page for this exact product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
NOW Foods COA portal: “A COA confirms that the product you purchased has gone through detailed testing and adheres to its product specifications and NOW standards.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
NOW Canada product page says: “NOW uses Ferrochel® Iron Bisglycinate, which has clinically demonstrated superior absorption and is well tolerated because it is gentle and non-constipating.” The same page also says NOW is “audited and certified by Intertek” on its Seals & Certifications page, but I did not find an independently verifiable product-specific certification or COA for this exact product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
ConsumerLab page for Fergon says: "1 product from Fergon was tested and reviewed by ConsumerLab" and the Fergon site says only "Results Following a Physician Directed Open-label* Patient Experience Study" for Fergon Restore, which is efficacy/patient-experience research rather than a purity/potency/contaminant test.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "We constantly source the best ingredients worldwide, test each individual product to ensure it meets our strict Quality Assurance Standards" and also "Laboratory Tested" / "Our products to the test, ensuring maximum potency from each formula we produce."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Amazon listing images show certification logos on the package, including "NSF Gluten-Free" and "Non-GMO Project Verified."
Laboratory
Not recorded
Certification body
Not recorded
Batch
Not recorded
Batch-specific report
Not established in this record
Report date
Not recorded
Evidence checked
2026-09-16 17:27:39
Why this score?
Testing & evidence
0/25
Ingredient/formulation quality
20/20
Value
6/20
Dose transparency
11/15
Manufacturer transparency
6/10
Label/ingredient transparency
5/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "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." Also: "Our formulas go through intensive ingredient analysis, material testing and physical trials..." and "ISO/IEC 17025:2017 Certified Lab" is listed on the company 'Our Difference' page, but I did not find an independently verifiable product-specific COA, lab report, or registry entry for this specific iron product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "We constantly source the best ingredients worldwide, test each individual product to ensure it meets our strict Quality Assurance Standards" and the homepage says "Laboratory Tested" / "BEST QUALITY GUARANTEED."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Nature’s Way says on its own site: “we require every raw material to come with a certification of analysis … and still test every ingredient batch we receive,” and the iron ingredient page says “Tests done on every batch” and “Nature’s Way tests the potency of every batch of raw material.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Nature's Truth's own "Our Quality" page says: "Our facilities and operations undergo random audits by the U.S. Food & Drug Administration, as well as independent third party entities, to verify safety and quality." It also says the company is "Fully Certified" and lists "Global Retailer and Manufacturer Alliance (GRMA) Certified through NSF" and "USP standards for heavy metals compliant."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
NOW Foods’ COA site states: “A COA confirms that the product you purchased has gone through detailed testing and adheres to its product specifications and NOW standards.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Thorne product page states: "It is NSF Certified for Sport®, ensuring rigorous testing for quality and the absence of substances banned by major athletic organizations" and NSF’s own registry page for "Thorne® Iron Bisglycinate" confirms the product is certified, listing Brand: Thorne®, Product Type: Mineral, Package Size: 60, Serving Size: 1 capsule, and multiple lot numbers.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
NOW Foods’ COA portal states generally that “Strength Testing” guarantees the product contains exactly what is on the label, and that NOW uses a science-based program to test raw materials and finished products for microbial and heavy metals contaminants. However, the specific COA page I could access was for Peppermint Oil (SKU 7495), not NOW Iron 18 mg, and I did not find an independently verifiable COA or certification page for this exact product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
NOW Foods COA portal: “A COA confirms that the product you purchased has gone through detailed testing and adheres to its product specifications and NOW standards.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
NOW Canada product page says: “NOW uses Ferrochel® Iron Bisglycinate, which has clinically demonstrated superior absorption and is well tolerated because it is gentle and non-constipating.” The same page also says NOW is “audited and certified by Intertek” on its Seals & Certifications page, but I did not find an independently verifiable product-specific certification or COA for this exact product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
ConsumerLab page for Fergon says: "1 product from Fergon was tested and reviewed by ConsumerLab" and the Fergon site says only "Results Following a Physician Directed Open-label* Patient Experience Study" for Fergon Restore, which is efficacy/patient-experience research rather than a purity/potency/contaminant test.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "We constantly source the best ingredients worldwide, test each individual product to ensure it meets our strict Quality Assurance Standards" and also "Laboratory Tested" / "Our products to the test, ensuring maximum potency from each formula we produce."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "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." Also: "Our formulas go through intensive ingredient analysis, material testing and physical trials..." and "ISO/IEC 17025:2017 Certified Lab" is listed on the company 'Our Difference' page, but I did not find an independently verifiable product-specific COA, lab report, or registry entry for this specific iron product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "We constantly source the best ingredients worldwide, test each individual product to ensure it meets our strict Quality Assurance Standards" and the homepage says "Laboratory Tested" / "BEST QUALITY GUARANTEED."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Nature’s Way says on its own site: “we require every raw material to come with a certification of analysis … and still test every ingredient batch we receive,” and the iron ingredient page says “Tests done on every batch” and “Nature’s Way tests the potency of every batch of raw material.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Nature's Truth's own "Our Quality" page says: "Our facilities and operations undergo random audits by the U.S. Food & Drug Administration, as well as independent third party entities, to verify safety and quality." It also says the company is "Fully Certified" and lists "Global Retailer and Manufacturer Alliance (GRMA) Certified through NSF" and "USP standards for heavy metals compliant."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
NOW Foods’ COA site states: “A COA confirms that the product you purchased has gone through detailed testing and adheres to its product specifications and NOW standards.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
One-time purchase prices; delivery and conditional discounts excluded. Daily cost uses the recorded label serving. Comparison amounts are not personal dose recommendations. Unknown Prime eligibility is not treated as confirmed.
Iron forms, explained
Start with the ingredient form, then compare the disclosed active amount and serving size.
Bisglycinate
Compare active content and the label serving for this form.
Gluconate
Compare active content and the label serving for this form.
Sulfate
Compare active content and the label serving for this form.
Other
Compare active content and the label serving for this form.
Fumarate
Compare active content and the label serving for this form.
Carbonyl
Compare active content and the label serving for this form.
Not disclosed
Compare active content and the label serving for this form.
Heme + Polysaccharide complex
Compare active content and the label serving for this form.
Testing evidence in this comparison
A testing claim is not the same as a verified report. No public evidence located does not mean a product has not been tested.
Testing review pending0
Recognised certification1
Verified independent evidence0
Manufacturer COA0
Testing claimed11
No public evidence located6
What does iron cost?
Current US comparison set, based on the daily serving shown on each label.
$0.04Lowest daily cost
$0.24Median daily cost
$0.68Highest daily cost
Price insights
Shown only where the underlying product data is reliable.
