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Open Community Question @CascadeRowing_WA • 45-59F • 150 mg elemental, pure bisgl • Week 3

▲ 37 Helpful • 2 Peer Replies

Does buffered magnesium oxide in 'bisglycinate' blends cause loose stools, and how do I spot it on the label?

Yes, it can. Magnesium oxide is about 60.3% elemental magnesium by weight, but it is poorly absorbed. The unabsorbed magnesium draws water into the bowel through an osmotic effect, and this is why oxide is used as a laxative. Some 'buffered' or 'chelated complex' products add oxide to raise the elemental number cheaply. Check the 'Other ingredients' and the Supplement Facts lines. Look for 'magnesium oxide', 'magnesium hydroxide', or 'buffered magnesium glycinate'. A 400 mg oxide dose supplies about 241 mg elemental, and most of it stays in the gut. To test your tolerance, start at 100 to 150 mg elemental from a pure bisglycinate with the evening meal, and raise it only if stools stay formed. Stop if you get cramping or watery diarrhea.

⚕ Pinned FDA / NIH / PubMed Clinical Context • Karim El-Sayed — Literature & Label Auditor

NIH ODS notes that high supplemental magnesium doses commonly cause diarrhea, nausea, and abdominal cramping. Magnesium oxide is about 60% elemental magnesium but has lower bioavailability than organic forms in published comparisons.

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Verified Peer Replies (2)

@LowPurineChef_FL • Verified Cohort Member • Week 30

If you take semaglutide, GI side effects like nausea, diarrhea, and abdominal pain are already listed in the label's adverse reactions. Stacking an osmotic magnesium source can make them harder to tell apart. Change one variable at a time and wait about a week before adjusting. Tell your prescriber about persistent pain or dehydration.

@GreatLakesKayak_MI • Age 30-44 • Week 5

I switched from a 'magnesium complex' with oxide to a plain bisglycinate at 120 mg elemental. The morning urgency stopped within three days. The old bottle listed oxide fourth in the ingredients, which I had missed.