review
Best Iron Supplements for Women: Non-Constipating Forms & Dosage
Comparing ferrous bisglycinate vs sulfate, managing GI side effects, third-party testing, and evidence-backed U.S. product recommendations.
By Nourish By Nutrients Editorial Team •
Updated: October 2026
Key Evidence Takeaways:
- Ferrous bisglycinate (gentle iron) offers high bioavailability with fewer GI side effects.
- Third-party testing (USP, NSF) ensures product purity and elemental iron accuracy.
- Iron supplements should only be taken when deficiency is confirmed by blood work.