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Which Iron Supplement Won't Cause Constipation During Pregnancy?

Medical disclaimer: This guide is for informational purposes only and is not a substitute for advice from your healthcare provider. Always confirm supplement choices with your OB, midwife, or pharmacist — especially in the first trimester.

Iron deficiency is common during pregnancy, but many iron supplements cause constipation and stomach upset. Here's what the SOGC says about the gentlest forms — and which Canadian brands deliver.

Ferrous bisglycinate — the gentlest form

Ferrous bisglycinate (also called iron bisglycinate chelate) is better absorbed and less likely to cause constipation than ferrous sulphate. The SOGC and Canadian guidelines support its use during pregnancy.

Webber Naturals Gentle Iron 28mg✓ Rating 8/10 — Safe

Ferrous bisglycinate 28mg — matches the pregnancy RDA. Includes folic acid and B12. Health Canada NPN. Non-constipating and well-tolerated.

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Jamieson Iron 28mg with Folic Acid✓ Rating 8/10 — Safe

Budget-friendly option from Canada's #1 supplement brand. 28mg iron with folic acid, B12, and vitamin C to enhance absorption.

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When to use therapeutic iron

FeraMAX 150mg is for diagnosed iron deficiency anemia only — use only under your healthcare provider's direction. It's highly effective but not for routine supplementation.

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