Is alkaline water better for you?

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Available research has not established consistent health or hydration benefits for alkaline water over regular water. Its pH is above 7, commonly around 8 or 9. Findings include heartburn relief with one particular mineral water, but don’t prove every alkaline bottle is better.

Why people believe it

Essentia says its water replaces lost water better than a leading bottled water. It cites a trial and feedback it reports from doctors and athletes. That gives the idea an understandable starting point. The 2026 review suggests that persuasive marketing and simple answers also help explain its appeal. The authors propose this explanation; it is not a survey finding.

“It hydrates you better”

A 2016 trial involved 100 healthy adults after water loss caused by exercise. They were randomly assigned equal amounts of electrolyzed alkaline or standard purified water. Their recovery was followed for two hours. On the high-shear measure, blood viscosity (resistance to flow) fell by an average of 6.30% with alkaline water. The average reduction with standard purified water was 3.36%. Three other hydration measures showed no significant difference between groups. Absolute blood viscosity readings also did not differ significantly between groups at several time points.

Essentia funded the trial and supplied water. One author received consulting fees and stock options. The authors say Essentia had no role in collecting data on site, analysing it or interpreting it.

“It helps acid reflux”

The 2023 STOMACH STILL trial tested Staatl. Fachingen STILL, a bicarbonate-rich mineral water, against conventional mineral water. The amount was 1.5 litres daily for six weeks. The trial’s 148 adults had frequent heartburn for at least six months. They had no moderate or severe inflammation of the food pipe related to reflux. The trial measured a drop of at least five points in the Reflux Disease Questionnaire (RDQ) heartburn score. This occurred in 84.72% with bicarbonate-rich water versus 63.51% with conventional water. This supports that particular comparison, but does not show that pH itself was the cause.

“It strengthens bones”

A 2021 trial involved 100 women past menopause with osteoporosis, a condition involving low bone density. The treatment was calcium D and Osteofos, with or without 1.5 litres of alkaline water daily for three months. Adding that water improved the spine T-score, a bone-density score, more than the same treatment without it. The change in the thigh-bone T-score did not differ significantly between groups. Diet was not controlled, and the paper gives inconsistent figures for the water’s pH. This does not establish that it prevents broken bones.

“It reduces inflammation”

An eight-week trial in 40 active adults tested alkaline water also enriched with hydrogen. The trial measured levels of IL-6, a marker of inflammation. After adjustment for starting levels, IL-6 was lower with that water than with standard water immediately after exercise. The authors warn that large starting differences limit conclusions about cause. The comparison cannot separate the effects of alkalinity from those of added hydrogen.

“It prevents disease”

A 2026 narrative review found no robust clinical evidence for disease prevention, stronger immunity or slower ageing. A cancer review found no alkaline-water prevention or treatment studies in searches ending April 2015. That is a dated finding, not a current search covering all studies.

Official positions, with dates

Canada's food inspection agency permits factual pH labels that do not mislead, in guidance modified 15 January 2025. It prohibits treatment or disease-prevention claims on mineral or mineralized water. EFSA adopted its opinion on 30 June 2011. It found no established cause-and-effect link between sodium/potassium carbonate or bicarbonate salts and maintaining normal bone. These concern labels and specific substances. They do not give a verdict on every alkaline-water study.

What people also ask

What is alkaline water?

Water with pH above 7, commonly around 8 or 9. Minerals or processing can make it alkaline.

What are the benefits of drinking alkaline water?

Some specific results are encouraging, as above. Consistent health or hydration benefits for alkaline water over regular water have not been established.

What is the downside of alkaline water?

One participant in a mineral-water trial’s high-bicarbonate/sodium group withdrew because of digestive discomfort. That alone does not establish that alkalinity caused it.

Is alkaline water safe for kidneys?

A University of Arkansas nutrition expert gives advice for people with kidney disease or sodium/potassium restrictions. They should consult their healthcare provider before routinely using electrolyte or highly mineralized products.

Who should not drink alkaline water?

The 2026 review urges caution for people with long-term kidney disease. It also urges caution for those taking medicines that reduce stomach acid, pregnant women and children.

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