Iron Bisglycinate NSF (Thorne) Review 2026: Review
Checks out. — Legitimate
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"Ferrochel® bisglycinate absorbs better with fewer GI side effects"
Chelated iron bisglycinate is better absorbed than ferrous sulfate and causes less constipation and nausea in clinical studies.
PubMed: Szarfarc et al. 2001, Bovell-Benjamin et al. 2000 (bisglycinate absorption trials) -
"25mg elemental iron per capsule"
25mg is within the standard therapeutic range (15–36mg/day) for adult iron deficiency — dose is appropriate and fully disclosed.
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"NSF Certified for Sport"
NSF Certified for Sport is a rigorous third-party program testing for label accuracy and 270+ banned substances. Thorne's certification is verifiable.
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"Iron supplementation fights fatigue"
Correcting iron deficiency reliably reduces fatigue — but only in people who are actually deficient. No benefit for iron-replete individuals.
Cochrane Review: Pasricha et al. 2013 (iron supplementation and fatigue)
Consumer advice
Get a blood test (serum ferritin + hemoglobin) before starting any iron supplement. If you're deficient, this is a solid choice — Ferrochel® bisglycinate is gentler on the stomach than ferrous sulfate and absorbs well. The 25mg dose is appropriate for most adults with mild-to-moderate deficiency. Take it on an empty stomach with vitamin C for best absorption, or with food if it bothers your stomach. Don't take it within 2 hours of thyroid medication, antibiotics, or antacids. If you can't see the price without a practitioner account, comparable products (Solgar Gentle Iron, Doctor's Best) are available retail for $15–20 per 90 capsules.
Claims vs Evidence
MODEST2 of 3 claims supported by evidence.
"Essential for red blood cell formation"
Supported
Iron is required for hemoglobin synthesis — well established.
Based on: Iron (as Ferrochel® Ferrous Bisglycinate Chelate)
"Helps fight fatigue and symptoms of iron deficiency"
Supported
Correcting deficiency reliably reduces fatigue.
Based on: Iron (as Ferrochel® Ferrous Bisglycinate Chelate)
"Optimal absorption, decreases GI side effects vs. ferrous sulfate"
Partial
Bisglycinate absorbs better; GI advantage is real but modest.
Based on: Iron (as Ferrochel® Ferrous Bisglycinate Chelate)
2 supported · 1 partial
Signals
- Shows actual ingredient doses
Ingredients
Based on peer-reviewed research from PubMed and Examine.com
Why the chain breaks for this product
Most ingredients below have real research behind them. The problem isn't the ingredients — it's the doses. 3 of 3 are not disclosed on the label, so the product can claim the benefits without delivering the chain that gets you there.
Iron (as Ferrochel® Ferrous Bisglycinate Chelate)
Essential mineral. Treats iron deficiency anemia, but supplementation carries real risks if not needed.
Research-backed dose: 15–36mg elemental iron daily (adult therapeutic range)
In this product: 28 mg
Hypromellose Capsule
Amino acid found in collagen. Limited human evidence; mostly used as a lab marker for collagen and fibrosis.
Leucine
Amino acids found in protein-rich foods. Limited direct evidence from provided studies for fitness benefits.
Research sources: PubMed · Examine.com
Analyzed product: https://fullscript.com/catalog/products/iron-bisglycinate-60-vegcaps
Analysis generated: 2026-06-02 · Engine v1.0.0
Frequently Asked Questions
Is Iron Bisglycinate NSF (Thorne) a scam?
Iron Bisglycinate NSF (Thorne) does not appear to be a scam. Our analysis found the claims are generally supported by the ingredients.
What are the ingredients in Iron Bisglycinate NSF (Thorne)?
Iron Bisglycinate NSF (Thorne) contains 3 ingredients including Iron (as Ferrochel® Ferrous Bisglycinate Chelate), Hypromellose Capsule, Leucine.
Does Iron Bisglycinate NSF (Thorne) actually work?
Yes, Iron Bisglycinate NSF (Thorne) can work for its intended purpose. 3 of 3 claims are supported.