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Thorne Iron Bisglycinate 25mg vs Gentle Iron 20mg 90 Vegi Capsules

Side-by-side comparison of scores, ingredients, prices and real customer feedback for Thorne Iron Bisglycinate 25mg and Gentle Iron 20mg 90 Vegi Capsules.

Last verified: 07 Apr 2026 · Based on 130 reviews

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84.0
Quick Answer

Thorne Iron Bisglycinate 25mg scores 84.0/100 vs Gentle Iron 20mg 90 Vegi Capsules at 77.0/100. Thorne Iron Bisglycinate 25mg wins on effectiveness, ingredient quality, value for money.

Which is better: Thorne Iron Bisglycinate 25mg or Gentle Iron 20mg 90 Vegi Capsules?

Thorne Iron Bisglycinate edges ahead with a higher score (84 vs 77) and a stronger 25mg dose backed by NSF certification for independently verified purity. Solgar Gentle Iron suits budget-conscious buyers — it costs £4.35 less and still delivers the same stomach-friendly bisglycinate form with proven ferritin-raising results. Neither includes vitamin C, so pair whichever you choose with ascorbic acid for best absorption.

— AIScored Editorial Team

How Do the Scores Compare?

Thorne Iron Bisglycinate 25mg
Gentle Iron 20mg 90 Vegi Capsules
Thorne Iron Bisglycinate 25mg
Thorne Iron Bisglycinate 25mg
Thorne
 Gentle Iron 20mg 90 Vegi Capsules
Gentle Iron 20mg 90 Vegi Capsules
Solgar
Overall Score 84.0 77.0
Effectiveness 84.0/100
Best
 76.0/100
Ingredient Quality 93.0/100
Best
 86.0/100
Value for Money 68.0/100
Best
 66.0/100
Side Effects 93.0/100
Best
 91.0/100
Certifications 91.0/100
Best
 60.0/100
Best Price £16.99 Amazon UK → £12.64 Amazon UK →
Cheapest
Price per Serving £0.28 60 servings N/A
Form Capsules capsule
Dose 25mg elemental iron None
Third-Party Tested ✓ Yes ✗ No
Reviews Analysed 68 62

Thorne Iron Bisglycinate 25mg

Pros

  • ✓Bisglycinate (Ferrochel®) form is highly bioavailable and consistently reported as gentle on the stomach with no constipation or nausea
  • ✓Measurable improvements in ferritin and hemoglobin confirmed by multiple reviewers via blood tests
  • ✓NSF Certified for Sport — independently verified for purity and label accuracy
  • ✓Ultra-clean formula: only pharmaceutical-grade excipients, no magnesium stearate, fully vegan and allergen-free

Cons

  • ✗No vitamin C included — absorption is suboptimal without pairing with ascorbic acid (users note this and add their own)
  • ✗25 mg dose may be insufficient for severe iron deficiency recovery; therapeutic correction often requires higher daily intake
  • ✗Premium pricing — noticeably more expensive per serving than ferrous sulfate or gluconate alternatives
  • ✗At least one reviewer with chronic severe malabsorption found no improvement, ultimately requiring IV iron infusion

Best For

Women with iron deficiency anaemia or low ferritin Pregnant or postpartum women needing gentle iron support People who have experienced GI side effects (constipation, nausea) with ferrous sulfate Athletes requiring NSF Certified for Sport supplements Vegans seeking a clean, allergen-free iron source Those looking to maintain iron levels rather than recover from severe deficiency
Amazon UK £16.99
View full review →

Gentle Iron 20mg 90 Vegi Capsules

Pros

  • ✓Iron bisglycinate is among the most stomach-gentle and bioavailable forms of iron available
  • ✓Overwhelming reviewer consensus: no constipation, nausea, or digestive discomfort
  • ✓Effective at raising ferritin and haemoglobin levels, with multiple users citing confirmed blood test improvements
  • ✓Well-tolerated by sensitive groups including pregnant women and those with IBS or autoimmune conditions

Cons

  • ✗20mg single daily dose may be insufficient for correcting significant iron deficiency without medical guidance to increase dosage
  • ✗No confirmed third-party purity or potency testing (e.g. NSF, Informed Sport)
  • ✗Premium Solgar pricing makes it considerably more expensive than generic iron supplements
  • ✗Rare but present reports of GI discomfort, indicating bisglycinate does not suit every individual

Best For

Women with heavy periods or mild-to-moderate iron deficiency Pregnant or postpartum women needing gentle, low-risk iron support People who experience constipation or nausea from standard ferrous sulfate tablets Those with IBS, IBD, SIBO, or other GI sensitivities requiring careful supplementation Vegetarians and vegans prone to lower dietary iron intake Maintenance supplementation after completing a course of prescribed iron treatment
Amazon UK £12.64 Holland & Barrett £12.88
View full review →

What does the data say about Thorne Iron Bisglycinate 25mg vs Gentle Iron 20mg 90 Ve...?

Both products use iron bisglycinate — the chelated form known for being easy on the stomach — but they differ in dose and credibility. Thorne's version delivers 25mg using Ferrochel®, a branded and extensively studied form of bisglycinate, and carries NSF Certified for Sport status, meaning it's been independently verified for purity and label accuracy. Solgar's Gentle Iron offers 20mg in an unbranded bisglycinate form with no confirmed third-party testing. That 5mg difference matters if you're actively correcting a deficiency, and the certification gap matters if you care about what's actually in the capsule.

Thorne at £16.99 makes sense if you've had problems with ferrous sulfate before and want the reassurance of third-party verification — particularly relevant for pregnant women or athletes subject to doping controls. Solgar at £12.64 suits someone with mild, maintenance-level needs who wants a gentle option without paying a premium for certification they don't require.

One practical note applies to both: neither includes vitamin C, which meaningfully boosts non-haem iron absorption. Taking either capsule alongside a small glass of orange juice or a separate ascorbic acid supplement is worth doing. Solgar's lower dose also means anyone with significantly depleted ferritin should check with their GP before relying on it alone.

Thorne Iron Bisglycinate 25mg Winner 84.0/100

Thorne Iron Bisglycinate delivers 25 mg of elemental iron in the Ferrochel® chelated bisglycinate form, widely praised in reviews for being exceptionally gentle on the digestive system — no nausea, constipation, or metallic aftertaste that commonly plague ferrous sulfate alternatives.

Effectiveness
Thorne Iron Bisg..
84.0/100
Gentle Iron 20mg..
76.0/100
Ingredient Quality
Thorne Iron Bisg..
93.0/100
Gentle Iron 20mg..
86.0/100
Value for Money
Thorne Iron Bisg..
68.0/100
Gentle Iron 20mg..
66.0/100
Side Effects
Thorne Iron Bisg..
93.0/100
Gentle Iron 20mg..
91.0/100
Certifications
Thorne Iron Bisg..
91.0/100
Gentle Iron 20mg..
60.0/100

What are the key differences?

Thorne Iron Bisglycinate 25mg is best for: Women with iron deficiency anaemia or low ferritin, Pregnant or postpartum women needing gentle iron support
Gentle Iron 20mg 90 Veg.. is best for: Women with heavy periods or mild-to-moderate iron deficiency, Pregnant or postpartum women needing gentle, low-risk iron support

Frequently Asked Questions

Which is better, Thorne Iron Bisglycinate 25mg or Gentle Iron 20mg 90 Vegi Capsules? ▼
Thorne Iron Bisglycinate 25mg scores 84.0/100 overall while Gentle Iron 20mg 90 Vegi Capsules scores 77.0/100. Thorne Iron Bisglycinate 25mg comes out ahead, scoring higher on effectiveness (84.0 vs 76.0). Thorne Iron Bisglycinate 25mg is best suited for Women with iron deficiency anaemia or low ferritin and Pregnant or postpartum women needing gentle iron support. Gentle Iron 20mg 90 Vegi Capsules is better for Women with heavy periods or mild-to-moderate iron deficiency and Pregnant or postpartum women needing gentle, low-risk iron support.
Is Thorne Iron Bisglycinate 25mg worth the price compared to Gentle Iron 20mg 90 Vegi Capsules? ▼
Thorne Iron Bisglycinate 25mg costs £16.99 while Gentle Iron 20mg 90 Vegi Capsules is £12.64. For value, Thorne Iron Bisglycinate 25mg scores 68.0/100 vs Gentle Iron 20mg 90 Vegi Capsules's 66.0/100. Thorne Iron Bisglycinate 25mg delivers better value relative to its quality. Note that Thorne Iron Bisglyci comes as capsules while Gentle Iron 20mg 90 is capsule, which may affect your preference.
Which has fewer side effects? ▼
Thorne Iron Bisglycinate 25mg scores 93.0/100 for side effects (higher means fewer reported issues) while Gentle Iron 20mg 90 Vegi Capsules scores 91.0/100. Reviewers report fewer side effects with Thorne Iron Bisglycinate 25mg. For certification and testing, Thorne Iron Bisglyci scores 91.0/100 vs Gentle Iron 20mg 90 's 60.0/100. Always consult a healthcare professional before starting any supplement.

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Disclaimer: AIScored provides data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.

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