SupplementDuel

Iron Bisglycinate

Mineral

Best-tolerated iron form for treating deficiency anemia. Don't supplement without a confirmed low ferritin / low Hgb test.

anemiaenergymenstruationendurance
Typical dose
18–25 mg elemental iron
Evidence
Strong (multiple RCTs / meta-analyses)
Onset time
Cumulative: 4–12 weeks
Half-life
—
Forms
Capsule, Tablet
Source
synthetic
Best taken with
vitamin C, empty stomach (or with food if GI sensitive)
Best time of day
morning
Bioavailability
5/5
Safety rating
3/5
Price per serving
$0.18
Vegan / GF / 3rd-party
✓ / ✓ / ✓
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Vetted brands, third-party testing, ships worldwide.

Common uses

  • • Anemia treatment
  • • Heavy menstruation
  • • Endurance athletes

Effect profile

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Common side effects

  • • Constipation (less than ferrous sulfate)
  • • Dark stools

Avoid if

  • • Hemochromatosis
  • • Iron overload
  • • Untested males without deficiency

Drug interactions

  • • Levothyroxine
  • • Calcium
  • • PPIs

Related mineral supplements

Iron Bisglycinate vs ZincIron Bisglycinate vs Selenium (Selenomethionine)Iron Bisglycinate vs Iodine (Potassium Iodide)

Medical disclaimer

SupplementDuel is for educational purposes only and is not medical advice. Consult a physician before starting, stopping, or combining supplements.