Calcium-Rich Mineral Water: Lean Mass Signal, Not Fall Fix

High-calcium mineral water can make a meaningful dent in daily calcium and magnesium intake. Whether it prevents falls is another matter entirely.

A 2026 Italian trial found that drinking about one liter daily of calcium- and magnesium-rich water increased a lean-mass measure over 12 months in adults at fragility risk. The same study reported an eye-catching 82% relative reduction in falls at six months. By the prespecified 12-month endpoint, that fall advantage had disappeared. The practical conclusion is modest: mineral-rich water may be an easy dietary mineral source, but it is not a proven fall-prevention treatment.

A real mineral dose, tested against low-mineral water

The Moretti et al. randomized, double-blind trial enrolled 98 Italian adults, about 49 per group. Participants had fragility-risk indicators, were recruited through a rehabilitation outpatient service in Naples, had a mean age of about 63, and were 86.7% female.

For 12 months, one group drank Fonte Fausta SG9 water, which supplied about 587 mg of calcium and 128 mg of magnesium per liter. The control group drank Natia J66 water, with 36 mg calcium and 4.9 mg magnesium per liter. That is a substantial nutritional contrast. One liter of the intervention water provided roughly 49% of the daily calcium target commonly used for postmenopausal women and about 40% of the adult female magnesium target.

The more credible positive result was appendicular skeletal muscle mass indexed to height squared (ASMM/h²), measured with bioelectrical impedance analysis, or BIA. The high-mineral-water group had a statistically significant advantage over the control group at both six and 12 months. Low muscle mass matters clinically: a 2021 systematic review and meta-analysis of nine studies involving 10,028 older adults found lower appendicular skeletal muscle mass was associated with higher mortality during follow-up.

Still, a BIA lean-mass result is a surrogate outcome, not proof that participants gained functional muscle or reduced their risk of disability. BIA estimates depend partly on body-water distribution. Because the intervention and control waters differed in more than calcium and magnesium, including mineral composition that could affect fluid balance, the study cannot rule out a hydration-related contribution to the apparent lean-mass difference. DXA would have provided a more direct body-composition measurement.

The 82% fall headline fails its own follow-up test

The trial's fall result deserves much less confidence. At six months, the SG9 group showed an apparent 82% relative reduction in fall incidence. Relative figures can sound enormous when few events occur, especially in a trial with roughly 49 people per arm. The publication does not provide enough detail here to establish the absolute difference in falls or its confidence interval.

More important, the study did not sustain the finding. Falls were the primary endpoint at 12 months, and the high-mineral-water group had no protective advantage then. A dramatic interim result followed by a null primary endpoint is not evidence that the early result worked and then politely left the building. In a small trial with sparse fall events, chance variation can produce a large relative percentage. The 12-month result is the result that should guide decisions.

Fall prevention also requires evidence beyond a change in body composition. The sustained ASMM/h² difference and the vanished fall difference are separate outcomes. The former is preliminary evidence for a biomarker change; the latter does not establish that mineral water prevents falls.

Why the trial needs independent replication

Several design features limit what this single study can settle. Ferrarelle manufactured both the intervention and control waters. More concerning, the manufacturer held the sealed allocation-concealment envelopes. That arrangement puts a product maker inside a core safeguard of randomized trial conduct. It does not prove that anyone altered assignments, but it weakens confidence in a small study with a volatile clinical endpoint. No independent public funding source was disclosed.

The comparison also does not isolate calcium and magnesium. The control was another commercial mineral water, not an inert placebo, and unreported differences in bicarbonate, sodium, pH, trace elements, or carbonation handling could have contributed to group differences. The participant group also limits generalization: these were mostly women at fragility risk who were connected to a rehabilitation service, not a representative sample of healthy older adults or older men.

A 2023 systematic review of calcium-rich mineral waters found generally favorable findings for bone mineral density and some cardiovascular or metabolic markers. Its evidence base was moderate in quality and did not address falls or skeletal muscle mass. It supports the idea that mineral water can contribute nutritionally; it does not validate the six-month fall claim.

Water belongs below training and protein in the priority list

For preserving muscle and physical function with age, resistance training has a much deeper evidence base. A 2022 meta-analysis of 23 randomized studies involving 1,252 older adults with sarcopenia found exercise improved grip strength by 2.38 kg, knee-extension strength, lower-extremity muscle mass, walking speed, and functional mobility. A separate 2024 review of resistance training in secondary sarcopenia also found improvements in muscle strength, mass, and physical function.

Protein can add to that foundation. A 2023 systematic review and meta-analysis of whey protein during resistance training found benefits for skeletal muscle mass and strength in older people with sarcopenia. A 2026 meta-analysis found that amino acid-based supplements combined with resistance training improved handgrip strength and gait speed versus training alone, though the certainty of evidence was low to very low.

Calcium and magnesium adequacy still matter. If your intake is low, water with more than 500 mg calcium and 100 mg magnesium per liter can supply a useful fraction of daily needs without adding another pill to the counter. The trial authors cite outside literature asserting that calcium from mineral water has bioavailability comparable to dairy, but this trial did not itself provide fractional-absorption data. It also cannot tell us whether water is better than food, a standard calcium supplement, or simply adequate total dietary intake.

The sensible use case

Choose high-mineral water because you need an easy source of calcium and magnesium, enjoy drinking it, and can fit it into your overall diet. Do not pay a premium for a specific brand because of an 82% fall-risk headline that failed at 12 months.

For musculoskeletal longevity, put resistance training first, adequate protein next, and calcium plus magnesium sufficiency after that. Mineral water can help with the third item; it has not earned a place as a fall-prevention intervention.

For someone whose calcium intake is consistently low, swapping some daily drinking water for a naturally mineral-rich option is reasonable and likely low-friction. The lean-mass result makes the idea worth studying in larger, independently run trials using DXA and clinical outcomes. Until then, treat mineral water as food with minerals, not as a balance-training substitute.