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Study decoded · health · Emerging
Sulfate-Magnesium Mineral Water Increases Bowel Movements By Week Two, Trial Finds
Constipation relief1L/day mineral waterFaster response: 9 vs 16 daysEffect faded by week 3
A randomized, double-blind trial in Frontiers in Nutrition found that adults with chronic constipation who drank 1 liter a day of sulfate- and magnesium-rich mineral water had 1.31 more bowel movements per week than a low-mineral control group after two weeks, a gain that did not hold up by the trial's three-week primary endpoint.
Researchers ran a nationwide, decentralized, randomized, double-blind trial in adults meeting Rome IV criteria for chronic constipation. Sample size, age and sex were not reported in the available abstract. After a one-week run-in, participants drank either 1 liter a day of sulfate- and magnesium-rich mineral water or 1 liter a day of low-mineralized control water for three weeks, keeping total daily fluid intake at 1.5 liters or more. At two weeks, the mineral-water group averaged 1.31 more bowel movements per week (±3.24) compared with 0.34 more in the control group (±2.49). Time to treatment response was faster with the mineral water: a median of 9 days versus 16 days in the control group. The effect on bowel movement frequency and responder rate was larger in participants with moderate-to-severe constipation at baseline. At the study's registered three-week primary endpoint, bowel movement frequency did not differ between the two groups. Stool consistency, constipation symptom scores (PAC-SYM), quality-of-life scores (PAC-QoL) and gut transit time also did not differ between groups. Both waters were well tolerated, with only mild, temporary side effects reported.
Bowel movement increase at 2 weeks: 1.31 vs 0.34 per week
Magnesium and sulfate are both osmotic compounds that pull extra water into the intestine, which softens stool and can trigger a bowel movement — the same mechanism behind osmotic laxatives. The authors describe their mineral water as a non-pharmacological, real-world dietary approach for managing chronic constipation, distinct from prescription laxatives.
The trial's own registered primary endpoint, bowel movement frequency at three weeks, showed no difference between groups, and the study did not report the total number of participants, their ages or sex breakdown in the available abstract. The favorable results reported here come from a secondary, two-week analysis added after the fact, not the trial's confirmed primary outcome.
Data Panel
- Who
- Adults with chronic constipation (Rome IV criteria); sample size, age and sex breakdown not reported in the available abstract
- Design
- Nationwide, decentralized, randomized, double-blind, parallel-group trial with a one-week run-in period followed by three weeks of intervention
- Dose
- 1 L/day sulfate- and magnesium-rich mineral water (HSM) vs 1 L/day low-mineralized control water (LSM); total daily fluid intake kept at 1.5 L or more
- Primary result
- At the registered 3-week primary endpoint, bowel movement frequency did not differ between groups. In an additional 2-week analysis, the HSM group gained 1.31 more bowel movements/week (±3.24) vs 0.34 more (±2.49) with control water
- Secondary
- Time to treatment response: median 9 days (HSM) vs 16 days (control). Effect on frequency and responder rate was larger in moderate-to-severe constipation. No differences in stool consistency, PAC-SYM symptom scores, PAC-QoL, or gut transit time
- Funding / conflicts
- Not reported
Dr. Axe's Take
I like that this trial tested real mineral water instead of a magnesium supplement pill, but the honest read is that the three-week primary result came back flat — the two-week bump is a secondary finding, not the confirmed outcome. Magnesium and sulfate pulling water into the gut is basic physiology I trust, and it's a reasonable reason to consider magnesium citrate or magnesium glycinate for constipation-prone patients. This week, if you're backed up, drink enough water to stay clearly hydrated, add magnesium-rich foods like leafy greens and pumpkin seeds, and try a mineral-rich water alongside — not instead of — high-fiber foods.
— Dr. AxeDr. Axe Quiz