Research review
Does magnesium glycinate affect kidney stones or kidney disease? What the research does and doesn't show
A 2026 narrative review of 15 studies found current evidence does not support routine magnesium supplementation over established kidney-stone therapies like potassium citrate, and the data that exists is mostly about citrate-containing magnesium, not glycinate. Separately, reduced kidney function is the main reason magnesium supplements need medical guidance, because the kidneys are what clear magnesium from the body.
The evidence doesn't support magnesium glycinate as a treatment for kidney stones ahead of established options. A 2026 review of 15 studies found current evidence does not support routine magnesium supplementation over standard therapies like potassium citrate. Separately, reduced kidney function — not normal kidney function — is the real reason magnesium supplements need medical guidance, because the kidneys are what clear magnesium from the body.
What the evidence doesn't support
It doesn't support magnesium glycinate as a way to prevent or treat kidney stones instead of standard medical therapy, and it doesn't support taking magnesium supplements without medical guidance if your kidney function is already reduced. Most of the research behind the positive-sounding findings below used citrate-containing magnesium, not glycinate specifically, in people already managing a kidney condition.
What the trials found
A 2026 narrative review searched three databases for every study on magnesium and kidney stone disease, and found 15 that qualified: a mix of metabolic studies, observational research, and 4 randomized controlled trials. Observational data consistently showed that people with more magnesium in their urine tended to have fewer stones. Intervention studies found magnesium supplementation improved urinary chemistry — more magnesium and citrate excreted, less oxalate — especially when taken with meals. But the actual randomized-trial evidence was described as limited and inconsistent between studies. The review's bottom line: current evidence does not support using magnesium supplementation in place of established stone therapies like potassium citrate, though magnesium (particularly citrate-based forms) may be worth considering for certain patients under a doctor's guidance, such as those who can't tolerate potassium salts.
On the safety side, a 2019 review of magnesium imbalances notes that while the kidneys normally keep magnesium tightly regulated, severe and dangerous hypermagnesemia is rare and shows up almost exclusively in people whose kidney function is already substantially reduced and who are also taking in a lot of magnesium — from supplements, magnesium-based laxatives, or antacids. That's the actual mechanism behind the "check with a doctor if you have kidney disease" caution seen on many supplement labels: it's about the kidneys' reduced ability to clear magnesium, not a hazard for people with normal kidney function at ordinary doses.
A separate 2025 review looked at whether magnesium supplementation might help slow the progression of chronic kidney disease itself, discussing proposed effects on insulin sensitivity, proteinuria, and vascular calcification. It's an active area of research, not a settled one: the same review explicitly flags hypermagnesemia as a real risk "particularly in advanced CKD stages" and says more research is needed just to establish a safe, effective dose. That makes it a question for a nephrologist managing someone's care, not something to act on by choosing a supplement.
Questions people ask
Can magnesium glycinate cause kidney stones?
No evidence reviewed here supports that. If anything, observational research points the other way — more urinary magnesium has been associated with fewer stones, not more. That's an association in the data, not proof that supplementing prevents stones.
Can you take magnesium glycinate with kidney disease?
This depends on how much kidney function is left, which isn't something to assess yourself. Reduced kidney function changes how much magnesium the body can clear, and that's the specific situation where high magnesium intake becomes risky. Anyone with diagnosed kidney disease should ask their doctor before starting any magnesium supplement.
When to talk to a doctor
A kidney stone diagnosis or any stage of chronic kidney disease needs ongoing medical management, including decisions about diet, fluids, and which supplements are safe given your specific kidney function. Magnesium glycinate is not a treatment for kidney stones or kidney disease. If you have been diagnosed with either, or don't know your current kidney function, ask a doctor before adding a magnesium supplement.
Related reading: how much magnesium glycinate is too much? and magnesium glycinate and medications: what to check.
Sources
- Magnesium and kidney stones: a concise narrative review A 2026 review of 15 studies on magnesium and kidney stones found that while higher urinary magnesium is linked to fewer stones in observational data, the actual randomized-trial evidence is limited and doesn't support using magnesium supplements instead of standard stone therapies like potassium citrate. The forms studied were mostly citrate-containing, not glycinate.
- Hypomagnesemia and hypermagnesemia A 2019 review states that dangerous, severe hypermagnesemia is rare and happens almost only in people whose kidney function is already substantially reduced and who are also taking in a lot of magnesium from supplements, laxatives, or antacids — not in people with normal kidney function.
- Unraveling the Mechanisms of Magnesium Supplementation in Alleviating Chronic Kidney Disease Complications and Progression: Balancing Risks and Benefits This review says both too little and too much magnesium carry risk in chronic kidney disease, and specifically warns that supplementing needs careful monitoring in advanced kidney disease because of the risk of magnesium building up.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.