Can I take magnesium citrate while pregnant?

Can I take magnesium citrate while pregnant?

Yes, magnesium citrate is generally safe during pregnancy when used as a dietary supplement at standard doses. Caution is needed if using it as a laxative, since the higher doses involved carry more risk.

This is a question that comes up frequently, and the distinction between supplement use and laxative use is where it matters most.

RELATED: Can you take magnesium while pregnant?

Supplement vs. laxative: know the difference

As a supplement, magnesium citrate is taken in capsule or powder form at moderate doses (200-400 mg of elemental magnesium). At these levels, it's well absorbed and supports muscle relaxation, blood pressure regulation, and nerve function. It also has a mild natural laxative effect that many pregnant women find helpful for pregnancy-related constipation.

As a laxative, magnesium citrate is sold as a liquid in larger bottles at the pharmacy. The dose is much higher and works by drawing water into the intestines. This can effectively relieve constipation, but it carries a risk of dehydration and electrolyte shifts that are particularly concerning during pregnancy.

Why magnesium citrate helps during pregnancy

Constipation is one of the most common discomforts of pregnancy, typically driven by increased progesterone (which slows digestion) and iron supplementation. Magnesium citrate at moderate supplemental doses can help with regularity without the intensity of a full laxative dose.

Magnesium citrate also supports blood pressure regulation, muscle relaxation, and sleep quality. 

Recommended dosage

The RDA for magnesium during pregnancy is 350-360 mg daily from all sources. The tolerable upper intake level from supplements alone is 350 mg. Factor in any magnesium already in your prenatal vitamin and through diet before adding a separate supplement.

RELATED: What to know about magnesium for postpartum

A note from WeNatal on magnesium citrate during pregnancy

WeNatal Rest + Digest Magnesium includes magnesium citrate as part of its multi-form blend, specifically designed with constipation in mind. The citrate component can support regular bowel movements without being too harsh, while the other forms (glycinate, malate, and gluconate) help with relaxation, sleep, and nervous system support. It pairs naturally with WeNatal for Her as part of a complete prenatal routine.

RELATED: Magnesium for better sleep and digestion: Benefits, best types, and Oura ring insights

References

Makrides M, et al. (2014). Magnesium supplementation in pregnancy. Cochrane Database of Systematic Reviews. DOI: 10.1002/14651858.CD000937.pub2