Is Magnesium Glycinate Safe During Pregnancy?
Updated September 8, 2026
The Answer
Magnesium glycinate is generally compatible with pregnancy when your total magnesium intake stays at normal dietary and prenatal supplement levels. The 350 mg/day upper limit applies to magnesium from supplements and medications not magnesium naturally present in food.
The key distinction is whether magnesium comes from food or from supplements and medications: only supplemental and medication magnesium counts toward the 350 mg/day upper limit.
NIH pregnancy guidance establishes magnesium intake recommendations and a 350 mg/day upper limit specifically for supplemental or medication magnesium, while recognizing magnesium as an essential nutrient.
Already used it? If you already took magnesium glycinate, check your total magnesium from supplements and medications, including your prenatal. Contact your clinician or pharmacist if the amount was high, you have kidney impairment, or you develop diarrhea, nausea, or cramping.
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What Is Magnesium Glycinate?
You may also see it listed as: magnesium bisglycinate
Magnesium glycinate combines the essential mineral magnesium with glycine. It is commonly used in supplements marketed to support magnesium levels, relaxation, sleep, and muscle function, and is sold in forms such as capsules, powders, and gummies.
What Other Ingredients Should You Look Out for in Products With Magnesium Glycinate?
A product's full ingredient list determines whether it's pregnancy-safe or not. These ingredients also appear in some of the magnesium glycinate products we analyzed and may deserve a closer look.
Lavender Oil
CautionLook for “English lavender essential oil” or “lavender essential oil” on the label. In an ingestible supplement, concentrated lavender oil has limited pregnancy data, so confirm that the product is intended to be swallowed and review it with your prenatal clinician.
Flagged in 2 products (1.4%) in this analysis.
Does the Form or Amount of Magnesium Glycinate Matter During Pregnancy?
For oral use, normal dietary magnesium and prenatal level supplementation are generally compatible with pregnancy, while high dose supplements and magnesium containing laxatives or antacids can cause side effects and, rarely, toxicity especially with kidney impairment. Normal topical cosmetic use on intact skin has low expected systemic exposure, although direct pregnancy studies are limited; irritation or significantly broken skin can change exposure. Intravenous magnesium sulfate used in obstetric care is a separate, clinician supervised treatment.
What Products Contain Magnesium Glycinate?
Pregnancy Safe has looked at 264 products that have magnesium glycinate as an ingredient. The category and grade breakdowns below use 141 products whose names mention Magnesium Glycinate or another name for it.
What Types of Products Contain Magnesium Glycinate?
Products You May Have That Contain Magnesium Glycinate
| Grade | Product | Brand | Type |
|---|---|---|---|
| B+ | Magnesium (Glycinate) | Pure Encapsulations | Dietary Supplement |
| B+ | High Absorption Magnesium Glycinate 240 Mg | Nature'S Bounty | Dietary Supplement |
| B+ | Nature'S Bounty Magnesium Glycinate 240Mg | Nature'S Bounty | Dietary Supplement |
| A | High Absorption Magnesium Glycinate, 240Mg | Natrol | Dietary Supplement |
| B+ | Magnesium Glycinate 120 Mg 90 Capsules | Pure Encapsulations | Dietary Supplement |
| A | Magnesium Glycinate Veggie Capsules | Jarrow Formulas | Dietary Supplement |
| A | Magnesium Glycinate 90 Vegetarian Capsules | Life Extension | Dietary Supplement |
| B+ | Magnesium Glycinate 665 Mg | Nature'S Truth | Dietary Supplement |
How Do Products Containing Magnesium Glycinate Score?
It can be helpful to see how products containing magnesium glycinate generally score during pregnancy. This does not tell you whether your exact product is safe, but it gives you a general idea of what we found. In this breakdown of 141 products, 62% receive a B grade. A B grade means the complete formula is likely safe, with minimal identified risk.
Frequently Asked Questions About Magnesium Glycinate During Pregnancy
How much magnesium is recommended during pregnancy?
NIH guidance sets the magnesium RDA at 350–360 mg/day for pregnant adults and 400 mg/day for pregnant adolescents. These totals include food, while the 350 mg/day upper limit applies only to magnesium from supplements and medications.
Is 500 mg of magnesium glycinate safe during pregnancy?
If 500 mg is the amount of supplemental magnesium, it exceeds the 350 mg/day upper limit for magnesium from supplements and medications. Review the label and your total intake from your prenatal, other supplements, antacids, and laxatives with your clinician.
Can I take magnesium glycinate every day while pregnant?
Daily use can be compatible with pregnancy when it keeps total supplemental magnesium within normal prenatal level intake. Account for magnesium from every supplement and medication rather than evaluating one product alone.
Does the answer change in early pregnancy or the third trimester?
The available magnesium guidance does not provide different oral supplement limits by trimester. The same dose and medical context cautions apply throughout pregnancy.
When should I take magnesium glycinate during pregnancy?
The available evidence does not establish a pregnancy specific best time of day. Follow the product directions and any timing advice from your clinician or pharmacist.
Are topical magnesium products safe during pregnancy?
Normal cosmetic use on intact skin is considered compatible with pregnancy based on cosmetic safety assessments and low expected systemic exposure. Direct pregnancy studies are limited, and irritation or significantly broken skin may change exposure.
Is magnesium glycinate the same as intravenous magnesium sulfate?
No. Magnesium glycinate is an oral nutritional supplement form, while intravenous magnesium sulfate is a separate treatment used under obstetric supervision for specific pregnancy related indications.
How Do We Score Products for Pregnancy Safety?
We analyze each product's ingredients and category to flag known risks and provide cautionary notices for general category safety concerns.
A - Safe
Excellent choice! All ingredients are considered safe during pregnancy.
What to do: Use with confidence.
B - Likely Safe
Pretty much safe with very minimal risk. Some ingredients may have limited pregnancy studies, but no significant safety concerns have been identified.
What to do: Use with confidence.
C - Limit
Contains ingredients with some pregnancy considerations. Research shows these ingredients may have limited safety data, potential for minor hormonal effects, or require caution based on animal studies.
What to do: Use sparingly and consider safer alternatives when available.
D - Caution
Similar to C grade but contains multiple cautionary ingredients. The combination increases overall concern.
What to do: Try to avoid if that makes you feel better. If you've already used it, no need to panic.
F - Avoid
Contains an ingredient Pregnancy Safe recommends avoiding during pregnancy. This may reflect an established risk or a precaution based on limited evidence; check the ingredient guidance and exposure context.
What to do: Do not use during pregnancy. If you've already used it, don't worry - contact your OBGYN if concerned.
Sources
- https://cir-safety.org/sites/default/files/carbon122016rep.pdf
- https://medlineplus.gov/druginfo/meds/a601072.html
- https://medlineplus.gov/lab-tests/magnesium-blood-test/
- https://ods.od.nih.gov/factsheets/MVMS-HealthProfessional/
- https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
- https://ods.od.nih.gov/factsheets/Pregnancy-HealthProfessional/
- https://ods.od.nih.gov/factsheets/magnesium-healthprofessional/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC6507506/
- https://pubmed.ncbi.nlm.nih.gov/19514931/
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- https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2010/03/magnesium-sulfate-before-anticipated-preterm-birth-for-neuroprotection
- https://www.acog.org/womens-health/faqs/healthy-eating-during-pregnancy
- https://www.nccih.nih.gov/health/lavender
- https://www.mayoclinichealthsystem.org/hometown-health/speaking-of-health/essential-oils-and-pregnancy
- https://pubmed.ncbi.nlm.nih.gov/39685078/
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