Iron's minimal effect on constipation
Low-Dose Prophylactic Oral Iron Supplementation (Ferrous Fumarate, Ferrous Bisglycinate, and Ferrous Sulphate) in Pregnancy Is Not Associated With Clinically Significant Gastrointestinal Complaints: Results From Two Randomized Studies.
Most Relevant Research
We explored the effects of low-dose iron supplementation on gastrointestinal complaints, particularly constipation, in pregnant women. Conducting two randomized studies, we aimed to determine how different forms of iron—ferrous fumarate, ferrous bisglycinate, and ferrous sulphate—would affect the frequency of GI issues among healthy women throughout their pregnancy.
Through our investigations, we found that constipation was only significantly associated with higher doses of ferrous fumarate (80 mg/day). Interestingly, women taking lower doses of ferrous fumarate (20-60 mg/day) did not report more GI side effects, indicating that manageable doses of iron may be tolerated without significant worry about constipation.
Among the iron formulas tested, ferrous bisglycinate at 25 mg showed the best profile, resulting in fewer GI complaints overall compared to the others. In fact, it was linked to a lower incidence of black stools, which can often be associated with iron intake. Ultimately, we observed that while low-dose iron supplementation might incur some side effects, they are generally not severe enough to warrant a change in dosage or interruption of treatment.
No constipation!
Most Useful Review
I’ve noticed improvements in my energy, especially during menstruation, and I’ve not experienced any constipation, unlike with other iron supplements. The small size of the tablets makes them easy to take.