mineral · for acid reflux
Magnesium Glycinate
Acts as a mild antacid and may help the valve at the top of the stomach hold shut.
Say that in clinical terms
Magnesium acts as a mild antacid, neutralizing excess gastric acid. It also supports lower esophageal sphincter tone through smooth muscle regulation and reduces stress-related acid hypersecretion via HPA axis modulation.
How strong is the research?
1 paper read.
Who was studied: No trial has tested magnesium glycinate for reflux at all.
No human clinical trial evidence found for magnesium supplementation (in any form) treating acid reflux or GERD. PubMed searches returned only studies of alginate-antacid combination products (containing magnesium hydroxide as a buffering ingredient) and a fixed-dose combination drug (esomeprazole + magnesium hydroxide). We cannot stand behind this claim on the evidence we have, so it carries no rating.
How much to take
daily with evening meal
200–400 mg
Magnesium may help as a gentle antacid and smooth muscle relaxant. Glycinate form does not cause osmotic GI effects.
Before you take it
- NIH ODS Tolerable Upper Intake Level (UL) for supplemental magnesium is 350 mg/day for adults; the principal adverse effect above the UL is osmotic diarrhea; hypermagnesemia is rare with intact renal function but possible with chronically elevated doses.
- Tetracycline antibiotics (e.g., doxycycline, demeclocycline) and quinolone antibiotics (e.g., ciprofloxacin, levofloxacin): take the antibiotic at least 2 hours BEFORE or 4-6 hours AFTER magnesium supplementation, per NIH ODS. Note: this timing requirement is asymmetric.
- Bisphosphonates (e.g., alendronate): magnesium reduces oral bisphosphonate absorption; take at least 2 hours apart, per NIH ODS.
- Antihypertensive medications (ACE inhibitors, ARBs, calcium channel blockers): magnesium may potentiate blood-pressure-lowering effects; blood pressure should be monitored when these are combined.
- Loop diuretics (furosemide) and thiazide diuretics increase renal magnesium excretion; potassium-sparing diuretics decrease magnesium excretion — both are clinically relevant interactions in common patient populations.
- Long-term proton pump inhibitor (PPI) use reduces intestinal magnesium absorption and causes hypomagnesemia independent of dietary intake.
- Renal insufficiency and chronic kidney disease: impaired renal magnesium excretion substantially increases hypermagnesemia risk; supplementation requires medical supervision.
- The antacid effect seen with magnesium hydroxide, carbonate, and oxide forms is form-specific and does not apply to magnesium glycinate at typical supplement doses.
- Long-term PPI use (a common therapy in the acid reflux population) causes hypomagnesemia via reduced intestinal magnesium absorption — specifically relevant when counseling acid reflux patients who take PPIs and are considering magnesium supplementation.
- Antacid effects (acid neutralization) apply only to magnesium hydroxide, carbonate, and oxide forms, not to magnesium glycinate at supplement doses — this distinction is directly relevant to the acid reflux claim context.
When to take it
Best taken: evening
What we make of it
Glycinate has no meaningful antacid effect. That belongs to a different magnesium salt.
The detail
Neutralising stomach acid is what alkaline magnesium salts like hydroxide do. Glycinate is a chelated form with no meaningful antacid capacity at supplement doses, so the mechanism does not apply to it.