Iron Bisglycinate NSF, 60 Capsules
Size: 60 capsules
May be a fit for
- Adults with low ferritin seeking a gentle, non-constipating iron bisglycinate form
- Practitioners protocols requiring chelated iron with NSF Certified for Sport verification
- Women of reproductive age supporting healthy iron levels during menstruation
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Thorne's Iron Bisglycinate delivers 25 mg of elemental iron in chelated bisglycinate form, a highly absorbable, gentle-on-the-stomach format that supports healthy red blood cell production, oxygen transport, and energy metabolism. It's well-suited for individuals with increased iron needs, including women of reproductive age, athletes, or those with dietary gaps.
Why It's Worth Considering: The bisglycinate chelate is designed to reduce the GI discomfort commonly associated with iron supplementation, and this formula carries NSF Certified for Sport® verification, a meaningful credential for competitive athletes subject to testing.
Product details
Who it may suit
May be a fit for
- Adults with low ferritin seeking a gentle, non-constipating iron bisglycinate form
- Practitioners protocols requiring chelated iron with NSF Certified for Sport verification
- Women of reproductive age supporting healthy iron levels during menstruation
- Endurance athletes needing iron bisglycinate to maintain oxygen-carrying red blood cell support
Considerations
- Hemochromatosis (iron overload disorder)
- Taking thyroid medication — separate by 4+ hours
- Active GI bleeding (need medical evaluation, not supplements)
- Thalassemia or other iron-loading anemias
Compatibility & interactions
Works Well With
Take Separately From
What to expect over time
Energy Improvement
Reduced fatigue as oxygen delivery improves
Hemoglobin Rise
Measurable Hb increase (1-2 g/dL)
Ferritin Repletion
Ferritin stores rebuilding
Full Repletion
Target ferritin 50-100 ng/mL
Based on clinical iron supplementation data. Continue supplementing until ferritin reaches 50+ ng/mL.
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Absorption and tolerability matter
| Feature | Bisglycinate (gentle) | Ferrous Sulfate | Ferrous Fumarate | Heme Iron |
|---|---|---|---|---|
| Absorption | High (chelated) | Moderate | Moderate | Highest (animal-derived) |
| GI Side Effects | Minimal | Common (constipation) | Moderate | Minimal |
| Best For | Sensitive stomachs | Budget, proven | Higher elemental iron | Maximum absorption |
| Take With | Empty stomach OK | Vitamin C required | Vitamin C helps | Anytime |
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A few useful answers.
Research & further reading
More category questions
What is the best form of iron supplement?
Iron bisglycinate (Ferrochel) is the best-tolerated form with high absorption and minimal GI side effects. Ferrous sulfate is the most studied but commonly causes constipation and nausea. Heme iron polypeptide has the highest absorption rate but is animal-derived.
Why does iron cause constipation?
Non-chelated iron forms (ferrous sulfate, fumarate) are poorly absorbed — the unabsorbed iron irritates the gut lining and slows peristalsis. Chelated forms (bisglycinate) are absorbed more completely, leaving less unabsorbed iron in the gut. Taking vitamin C improves absorption and reduces GI side effects.
Can I take iron with other supplements?
Separate iron from calcium, zinc, magnesium, and dairy by 2+ hours (they compete for absorption). Separate from thyroid medication by 4+ hours. DO take iron WITH vitamin C (doubles absorption). Avoid taking with coffee or tea (tannins reduce absorption by 60%).
How do I know if I need iron?
Get a complete iron panel: serum ferritin (most sensitive — optimal is 50-100 ng/mL), serum iron, TIBC, and transferrin saturation. Symptoms of deficiency: fatigue, cold hands/feet, pale skin, brittle nails, shortness of breath, brain fog, and restless legs. Ferritin below 30 ng/mL warrants supplementation in most cases.
Supplement information is provided for education and is not a substitute for personalized medical advice. Supplements are not intended to diagnose, treat, cure or prevent disease. Read the current product label before use.